Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Life Sciences

Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 251041 - 251070 of 256552

Full-Text Articles in Entire DC Network

The American Mastodon With Mandibular Tusks, Erwin H. Barbour Mar 1931

The American Mastodon With Mandibular Tusks, Erwin H. Barbour

Bulletin of the University of Nebraska State Museum (1924–2023)

Mastodons and mammoths, represented by their relics, are so frequently exposed by shovel, plow, road grader, dredge, and rains, that they have become household words. They are plainly the commonest and best-known vertebrate fossils. They were fortuitously entombed, and are now accidently found. Their relics, though numerous, never represent the grand total that lived. Indeed, it was a rare individual that fell where circumstances favored rapid interment and consequent preservation; the grand majority fell in the open where their bones suffered rapid and complete decay. The American mastodon occupies a position between the long-jawed, long-skulled, four-tusked ancestor called Palaeomastodon, and …


The Vitamin A Content Of The Milk Of Holstein, Ayrshire, Jersey, And Guernsey Cows, H. P. Davis, I. L. Hathaway Feb 1931

The Vitamin A Content Of The Milk Of Holstein, Ayrshire, Jersey, And Guernsey Cows, H. P. Davis, I. L. Hathaway

Nebraska Agricultural Experiment Station: Historical Research Bulletins

A comparative study of the vitamin A content of milk produced by Holstein, Ayrshire, Jersey, and Guernsey cows was made by comparing the growth produced by 560 rats receiving milk from these breeds as their only source of vitamin A. The results showed some slight irregular differences in the gains produced by the milk from the different breeds. When these differences were considered in view of the individual variation of the experimental animals, they appeared negligible. This conclusion was substantiated by a statistical examination of the data. From the results of this study in which the experiments were duplicated, it …


Infection Experiments With Spindle Tuber And Unmottled Curly Dwarf Of The Potato, R. W. Goss Feb 1931

Infection Experiments With Spindle Tuber And Unmottled Curly Dwarf Of The Potato, R. W. Goss

Nebraska Agricultural Experiment Station: Historical Research Bulletins

It is probable that more than one insect species are capable of spreading some of the potato virus diseases. This conclusion was also indicated by repeated observations in the dry-land section of western Nebraska. While aphids are abundant and are probably the chief vectors of potato virus diseases in the more humid sections of the country, they are usually scarce in the western upland plains area and are not present in large enough numbers to account for the rapid spread of spindle tuber and unmottled curly dwarf which sometimes occurs. It was therefore considered advisable to determine the common potato …


North And South Dakota Horticulture, February 1931, North And South Dakota State Horticultural Societies Feb 1931

North And South Dakota Horticulture, February 1931, North And South Dakota State Horticultural Societies

North and South Dakota Horticulture

Volume 3, Number 2

Garden Notes, F.X. Wallner, Sioux Falls
North Dakota State Horticultural Society News Latter C.B. Waldron, Fargo, N.D.
Extracts from the Diary of a Traveling Man, W.A. Simmons, Sioux Falls
Garden Miscellany, Mrs. M.W. Sheafe, Watertown
New Fruit Trials Give Interesting Results, C. Bolles, McCook, Neb.
Possibilities of Growing Onions in the Red River Valley, Henry Peterson, Moorhead, Minn
Tomatoes, Thos. W. Hobart, Sioux Falls
Beekeeping Best on One-Man Scale
Premium List


Trenched Plots Under Forest Canopies, James W. Toumey, Raymond Kienholz Jan 1931

Trenched Plots Under Forest Canopies, James W. Toumey, Raymond Kienholz

Yale School of the Environment Bulletin Series

The relative importance of light and soil moisture in particular is better known than that of other environmental factors. We are coming to believe that the nature and condition of the reproduction and other surface vegetation beneath living canopies are not due to any single factor such as light or soil moisture, but to a complex of factors.


Rb31-253 Variety Tests Of Oats, Barley, And Spring Wheat, T.A. Kiesselbach, W.E. Lyness Jan 1931

Rb31-253 Variety Tests Of Oats, Barley, And Spring Wheat, T.A. Kiesselbach, W.E. Lyness

University of Nebraska-Lincoln Extension: Historical Materials

The use of superior varieties is of first importance in the production of spring small grains. The comparative merits of the different crops and their available varieties may be best determined through tests extending over a period of years. Tests of oats, barley, and spring wheat have been made on the Experiment Station Farm of the Nebraska College of Agriculture at Lincoln.

The plan has been to have these variety trials include the most promising sorts obtainable from Nebraska and other states. Most of the varieties grown have originated in the breeding experiments of various state and federal experiment stations. …


Circular No. 92 - Torrential Floods In Northern Utah Jan 1931

Circular No. 92 - Torrential Floods In Northern Utah

UAES Circulars

On account of the recurring nature and the destructive character of the floods which have devastated property in Davis County and elsewhere in recent years, it appeared advisable to make a special study of the situation, I, therefore, in 1930, appointed a commission of citizens whom I deemed especially qualified, including practical engineers, geologists, foresters, and stockmen, asking them "to study the origin and cause of floods in Davis County and other parts of the state, and to ascertain whether any flood prevention measures are feasible".


Kentucky Warbler (Vol. 7, No. 1), Kentucky Library Research Collections Jan 1931

Kentucky Warbler (Vol. 7, No. 1), Kentucky Library Research Collections

The Kentucky Warbler

No abstract provided.


Ec31-133 The Management Of Nebraska Soils (Revised March 1936), P.H. Stewart, D.L. Gross Jan 1931

Ec31-133 The Management Of Nebraska Soils (Revised March 1936), P.H. Stewart, D.L. Gross

University of Nebraska-Lincoln Extension: Historical Materials

The agricultural lands of this country are its greatest natural resource. History points out that nations with vast areas of good farm land are most likely to prosper and survive over long periods of time. Local communities, too, prosper and flourish in proportion to the productiveness of the surrounding land. Schools, social life, and business develop best in areas where the land is productive and properly managed and conserved.

Nebraska, in common with other states, has suffered by the depletion of soil fertility. The reduction in acres in legumes and grasses, and the deplation of the organic matter in the …


North And South Dakota Horticulture, January 1931, North And South Dakota State Horticultural Societies Jan 1931

North And South Dakota Horticulture, January 1931, North And South Dakota State Horticultural Societies

North and South Dakota Horticulture

Flower Notes, Mrs. M.W. Sheafe, Watertown
North Dakota State Horticultural Society News Letter, December, 1930, C.B. Waldron, Fargo, N.D.
Garden Notes, F.X. Wallner, Sioux Falls
Extracts from the Diary of a Traveling Man, W.A. Simmons, Sioux Falls
Annual Meeting South Dakota Horticultural Society
Evergreens in North Dakota, F.E. Cobb, Bottineau, N.D.
Scenic and Recreational Spots of South Dakota, E.J. Waltner, Hurley, S.D.
North Dakota Farmers and Homemakers' Week
Outdoor Winter Gardens, Thos. W. Hobart, Sioux Falls


The Natural Factors In The Selection Of Diet., Lamar William Neblett Jan 1931

The Natural Factors In The Selection Of Diet., Lamar William Neblett

Electronic Theses and Dissertations

No abstract provided.


The Effect Of Potassium-Iodide On The Embryological Development Of The Chick With Special Reference To The Growth Of The Long Bones., David M. Polot 1904-1978 Jan 1931

The Effect Of Potassium-Iodide On The Embryological Development Of The Chick With Special Reference To The Growth Of The Long Bones., David M. Polot 1904-1978

Electronic Theses and Dissertations

No abstract provided.


The Vitamin B Content Of Kale Greens., Virginia Lee Smith Jan 1931

The Vitamin B Content Of Kale Greens., Virginia Lee Smith

Electronic Theses and Dissertations

No abstract provided.


The Milford Mastodon, Mastodon Moodie I, Sp. Nov. A Preliminary Report, Erwin Hinckley Barbour Jan 1931

The Milford Mastodon, Mastodon Moodie I, Sp. Nov. A Preliminary Report, Erwin Hinckley Barbour

Bulletin of the University of Nebraska State Museum (1924–2023)

In developing the hydro-electric plant of the Iowa and Nebraska Light and Power Company, a number of dams were thrown across the Blue River and its branches. One of these, known as Dam No.7, was built across the West Blue, about nine miles southwest of Milford, Seward county, Nebraska. This dam raised the water well above the ordinary river level, and flooded fifteen or twenty acres of valley land. The impounded water soaked into, and washed against, the base of a twenty-foot bank of cross-bedded sand, until some time during the winter of 1931, a portion of the bank near …


The Musk-Oxen Of Nebraska, Erwin Hinckley Barbour Jan 1931

The Musk-Oxen Of Nebraska, Erwin Hinckley Barbour

Bulletin of the University of Nebraska State Museum (1924–2023)

The remains of no less than eight fossil musk-oxen are already known in Nebraska, of which one is preserved in the Museum at Hastings, Nebraska, and seven in the State Museum at Lincoln. This is a large number to be recorded in anyone state. As late as 1891 authors wrote that but two examples of musk-oxen were known in the United States, one from Kentucky, and one from Arkansas, if, indeed, they be valid species. Now that pioneer days are well behind this commonwealth, and that there is a growing sentiment for exploration and proper display of the State's resources, …


A New Crinoid Slab, A Bit Of Mississipian Sea Bottom, Erwin Hinckley Barbour Jan 1931

A New Crinoid Slab, A Bit Of Mississipian Sea Bottom, Erwin Hinckley Barbour

Bulletin of the University of Nebraska State Museum (1924–2023)

Crinoids are popularly known as stone-lilies, featherstars, and sea-lilies. The word lily is a misnomer, and many, misled by the name and by the lily-like form, associate crinoids with the plant kingdom. The name, feather-star, seems explicit for it refers to the feathery arms surrounding the cup or calyx, and expresses relationship to the starfishes and their kind. The cup is attached to a stem, and the stem is anchored to the ocean floor by so-called roots, which are really hold-fasts, or anchors. These features may be seen in the diagram at the end.


A New Amebelodont, Torynobelodon Barnumbrowni, Sp. Nov. A Preliminary Report, Erwin Hinckley Barbour Jan 1931

A New Amebelodont, Torynobelodon Barnumbrowni, Sp. Nov. A Preliminary Report, Erwin Hinckley Barbour

Bulletin of the University of Nebraska State Museum (1924–2023)

The subfamily of longirostrine mastodonts known as the Amebelodontinae have been so recently discovered and described that as yet they; are little known by the citizens of this state. They are most briefly and directly described as shovel-tusked mastodons. The first one found, namely Amebelodon fricki, was secured in April 1927, and was published June 1927. In the meantime, many other examples of Amebelodonts have been added to the Morrill Palaeontological Collections of the Nebraska State Museum. The exact number cannot be stated until the material shipped in from the field during the current season is unpacked, cleaned, and identified. …


Evidence Of Dinosaurs In Nebraska, Erwin Hinckley Barbour Jan 1931

Evidence Of Dinosaurs In Nebraska, Erwin Hinckley Barbour

Bulletin of the University of Nebraska State Museum (1924–2023)

Nebraska has long been a collecting ground famous for its fossil mammals, but as yet no dinosaurian bones have been reported, nor have they been expected. The distal end of a finely preserved femur, however, has recently been brought to light, supposedly occurring in position in the Dakota formation of eastern Nebraska. It was discovered, collected, and donated by Mr. J. B. White, (University of Nebraska, Law, class of 1899) on his farm two miles south of Decatur, in northeastern Burt County, near the Missouri River. It was found in undoubted Dakota sand associated with many leaf impressions. This is …


The Giant Beaver, Castoroides, And The Common Beaver, Castor, In Nebraska, Erwin Hinckley Barbour Jan 1931

The Giant Beaver, Castoroides, And The Common Beaver, Castor, In Nebraska, Erwin Hinckley Barbour

Bulletin of the University of Nebraska State Museum (1924–2023)

Respecting the giant beaver, Castoroides, in Nebraska, four occurrences can be reported. Of rodents in general the dawn. was in the early Eocene, at which time there were in existence certain squirrel-like members of the order. Rodents are a persistent group, and are among the smallest, most distinctive, most numerous and widely distributed orders of terrestrial mammals. No other order boasts of so many species, the number being between nine hundred and one thousand. In spite of wide divergencies and modifications adapting them to various modes of life, such as climbing, burrowing, swimming, flying, leaping, and running, there is remarkable …


A Morning's Consignment Of Proboscidean Freight, Erwin Hinckley Barbour Jan 1931

A Morning's Consignment Of Proboscidean Freight, Erwin Hinckley Barbour

Bulletin of the University of Nebraska State Museum (1924–2023)

In the accompanying cut the array of great tusks outlined through their rough crates may lack attractiveness, nevertheless the assemblage is quite out of the ordinary, and seems worth recording in bulletin form. In all museums, and like institutions, freight and express deliveries are matters of daily routine; however, the morning's freight shown in the cut is unique. Herein is represented the more showy portion of the proboscidean freight received at the Nebraska State Museum in a single consignment, in the field season of 1930. The other boxes of mammoth skulls, jaws, and bones, received at the same time, are …


Ec31-625 How To Produce Better Milk And Cream, E.L. Reichart Jan 1931

Ec31-625 How To Produce Better Milk And Cream, E.L. Reichart

University of Nebraska-Lincoln Extension: Historical Materials

Would you refuse a $20.00 bill when offered you as a present without any strings attached?

Would you not like to have it said that your creamery produces the best butter in Nebraska?

Would you not be glad to have people refer to your county as the best dairy county in Nebraska?

Of course you would because it would bring more cattle buyers into your community and you would get better prices for your bull and heifer calves.

You can accomplsih all these things by producing higher grade milk and cream. Perhaps the suggestions on the next few pages will …


Rb31-258 The Contribution Fo Nebraska Farm Women To Family Income Through Poultry And Dairy Products, M. Ruth Clark Jan 1931

Rb31-258 The Contribution Fo Nebraska Farm Women To Family Income Through Poultry And Dairy Products, M. Ruth Clark

University of Nebraska-Lincoln Extension: Historical Materials

This investigation was made in 1929-1930 for the purpose of studying the activities of Nebraska farm women in the raising of poultry and in the care of dairy products, to discover whether or not such activities resulted in a contribution to the family income. With this in view, a group of women were asked to keep records for one year (from April 1, 1929 to March 31, 1930) of the value and amount of dairy and poultry products sold or used, of all expense incurred in production, and of the time spent both by the homemaker herself and by all …


Certain Cultural Characteristics Of Digitalis Pupurea, (Linne) With A Proposed Chemical Assay, Clark W, Eidsmoe Jan 1931

Certain Cultural Characteristics Of Digitalis Pupurea, (Linne) With A Proposed Chemical Assay, Clark W, Eidsmoe

Electronic Theses and Dissertations

Since its introduction into modern medicine digitalis has occupied a very important position in our material medica. Its widespread use as a remedy in conditions of failing heart, and its effectiveness as a diuretic in certain dropsical conditions have gained for it a reputation which is equaled by few other drugs. The opinion of pharmacologiate and physicians as to its mode of action and its field of clinical usefulness has been revised a number of times, and there is much diversity of teaching as to its use in special ailments. Among some workers there is a tendency to restrict its …


Comparative Metabolism Of Several Calcareous Minerals In Poultry Feeding, John T. Tripp Jan 1931

Comparative Metabolism Of Several Calcareous Minerals In Poultry Feeding, John T. Tripp

Electronic Theses and Dissertations

In part one of this study it was found that chickens when given oyster shells, in addition to their regular diet, produced a greater number of eggs and eggs of greater shell strength than did the chickens that were given the other calcareous materials used in this experiment. Oyster shell was followed in the order of their effectiveness by clam shells, Black Hills limestone, Nenno chalk stone, and Wisconsin dolomitie limestone.


A General Discussion Of Trichinella Spiralis (Owen), An Investigation Of Infection Of The Brown Rat, And A Life History Study Of The Parasite In The White Rat, Carl A. Johnson Jan 1931

A General Discussion Of Trichinella Spiralis (Owen), An Investigation Of Infection Of The Brown Rat, And A Life History Study Of The Parasite In The White Rat, Carl A. Johnson

Electronic Theses and Dissertations

The purpose of this treatise is threefold: first, to present a general discussion of Trichinella spiralis,; second, to present the results of an investigation of infection with trichinae of 100 brown rats; and third, to present the results of infecting white rats under laboratory conditions.


Studies In The Life History Of The Croton Bug, Blatella Germanica (Linnaeus), Laurence Adams Carruth Jan 1931

Studies In The Life History Of The Croton Bug, Blatella Germanica (Linnaeus), Laurence Adams Carruth

Electronic Theses and Dissertations

The Croton bug, or German Roach as it is commonly called, has been widely known for centuries. In the past, a considerable amount of work was done in attempting to find methods of controlling this insect, but relatively little attention was given to a study of its morphology, time of development, or to the finer details of the life history. this lack of information is probably due, in part to the fact that there are several similar common species of roaches and also because the Croton bug has probably received less attention than the other roaches, at least from a …


Greenhouse Studies On The Relationship Of Age Of Wheat Plants To Infection By Puccinia Graminis Tritici, George W. Eade Jan 1931

Greenhouse Studies On The Relationship Of Age Of Wheat Plants To Infection By Puccinia Graminis Tritici, George W. Eade

Electronic Theses and Dissertations

The resistance of wheat to the stem-rust organism (Puccinia graminis tritei) has been under investigation for a number of years. Although rust resistance has been investigated from various angles, there still remains a question as to the nature of resistance, the time when resistance first appears in plants and whether or not it is of a stable character. Peltier found that environmental conditions could change the degree and type of stem rust infection on wheat plants; Miss Hart proved that stomatal behavior was very important in the rust resistance, and Harrington and Aamodt studied the inheritance of rust resistance and …


Studies On The Intestinal Absorption Of Histamine. , Raphael William Albi Jan 1931

Studies On The Intestinal Absorption Of Histamine. , Raphael William Albi

Master's Theses

No abstract provided.


The Spleen Considered With Special Reference To Its Functions, Louis J. Schmidt Jan 1931

The Spleen Considered With Special Reference To Its Functions, Louis J. Schmidt

Bachelors’ Theses

In arranging this thesis an attempt has been made to show that by virtue of its embryology, anatomy and histology, the spleen is the better enabled to carry out its alleged functions. The discussion here presented is confined to a story of the functions of the mammalian spleen alone. The similarities in the reactions of the spleen in the various mammalia is quite evident. Experimentation and observations were carried out on the lower mammalia while only the reactions of the splenectomized humans could be observed.


The Spleen: With Special Reference To Its Origin And Comparative Morphology, Morris Aaron Gilbert Jan 1931

The Spleen: With Special Reference To Its Origin And Comparative Morphology, Morris Aaron Gilbert

Bachelors’ Theses

Throughout the ages the spleen has been an object of the most active curiosity. The opinion that the spleen is unnecessary and of no use to the individual has prevailed with an uninterrupted succession in the World in all ages. In Persia, many centuries ago, in the reign of Abouserous it was a custom to splenectomize the horses that were kept to carry the King’s dispatches, in order to give them more agility and swifter feet. The great Aristotle thought the spleen to be a sort of spurious liver planted in the left side to correspond to the liver in …