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

Digital Commons Network™

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

University of Northern Iowa

Discipline
Keyword
Publication Year
Publication
Publication Type

Articles 4651 - 4680 of 4995

Full-Text Articles in Entire DC Network

Diet In Relation To Reproduction And Rearing Of Young, L. T. Anderegg Jan 1924

Diet In Relation To Reproduction And Rearing Of Young, L. T. Anderegg

Proceedings of the Iowa Academy of Science

Any information which aids in securing an answer to the question as to what constitutes an optimum diet is of the utmost importance. The employment of the biological method of investigation has been exceedingly fruitful of results in this field. By this method the diet is submitted to actual feeding tests with experimental animals and their behavior thereon is observed. For this purpose the rat is most frequently employed on account of its relatively small food consumption, its omniverous habit, and its comparatively short reproductive cycle and span of life. It is thus possible to get the life histories of …

Go to article

A Light-Colored Zone Of Subsoil Southern Iowa, W. G. Baker Jan 1924

A Light-Colored Zone Of Subsoil Southern Iowa, W. G. Baker

Proceedings of the Iowa Academy of Science

In the excavations of the new primary road cuts during the past three years many cross-sections of the soils of southern Iowa have been exposed to view. One zone of soil which is particularly noticeable occurs overlying the Kansan till. The zone is a light-colored layer and the leached or unleached loess, as the case may be rests upon it, while the gravels of the Kansan, with few exceptions lie under it. The reddish ferreto zone in connection with these gravels gives a contrast in colors which makes the light colored zone easy to distinguish in the cross-sections along many …

Go to article

The Differential Death-Rate Of The Sexes Among Animals, With A Suggested Explanation, S. W. Geiser Jan 1924

The Differential Death-Rate Of The Sexes Among Animals, With A Suggested Explanation, S. W. Geiser

Proceedings of the Iowa Academy of Science

It has been conclusively demonstrated in certain mammals, fishes, arthropods, nematodes and mollusks that the female sex has a greater longevity than the male. (Geiser, '21, '23; et al.) Longevity within the species appears to be inherited in the manner of "blending inheritance," i.e., its mode of inheritance is probably through a series of multiple gametic factors. (Beeton & Pearson, '00, '01; Pearl, Parker & Gonzalez, '23; Gonzalez, '23.)

Go to article

Results Of The Testing Program Given At Iowa State College, Nora M. Klise Jan 1924

Results Of The Testing Program Given At Iowa State College, Nora M. Klise

Proceedings of the Iowa Academy of Science

The results given in this report were based upon a study of 368 Home Economics students who had been given mental tests in the spring and fall of 1919. 145 of the 368 had been given Alpha mental test, and 223, Thorndike. High school records were available for 339 of them. The object was to study criteria for prediction of college scholarship. Alpha had the highest correlation with college average, 0.45 as compared with 0.34 for high school with college average, and 0.38 for Thorndike with college average. English had the highest correlation, with college average (0.59) of any individual …

Go to article

Snake Notes, J. E. Guthrie Jan 1924

Snake Notes, J. E. Guthrie

Proceedings of the Iowa Academy of Science

There is probably no inborn snake-dread. Snake species and personalities differ widely among themselves. A captive rattlesnake shed four skins and got four rattles in a year. Poisonous snakes shed and swallow their poison fangs. About 1600 rattlesnakes were presented for bounties last year in seven Iowa counties. Virginia elegans Kenn. is reported as new for Iowa. Figures of a double-headed garter snake and of a two-headed bullsnake embryo are given.

Go to article

A Study Of The Movements Of The Empty Stomach In The Mollusca, T. L. Patterson Jan 1924

A Study Of The Movements Of The Empty Stomach In The Mollusca, T. L. Patterson

Proceedings of the Iowa Academy of Science

Our knowledge concerning the variations of the gastric activity in the various animal groups is still very incomplete and this is notably true in the case of the invertebrates. The present investigation is limited to two species of marine and one specie of terrestrial mollusca, which in so far as I am aware, represents the first study to be made on the movements of the empty stomach in any of the invertebrates.

Go to article

The Alumni News Letter, V7n4, October 1, 1923, Iowa State Teachers College Oct 1923

The Alumni News Letter, V7n4, October 1, 1923, Iowa State Teachers College

The Alumni News Letter

Contains news of the College and its alumni.

Go to article

The Banana Snake Boa Imperator, J. E. Guthrie Jan 1923

The Banana Snake Boa Imperator, J. E. Guthrie

Proceedings of the Iowa Academy of Science

The snakes of the family Boidae are mainly confined to tropical countries in their distribution. There are two subfamilies, the true Boas and the Pythons; of which the Boas belong to the Western Hemisphere and the Pythons almost exclusively to the Old World-a single species of the latter being found in Mexico. Of the true Boas, only four species are known to occur in North America, and these are all small. One of these species is found in the states of the Pacific Coast, ranging from Washington southward. It is known as the "Rubber Boa" and seems to be a …

Go to article

Some Food Reactions Of Snails, E. W. Johns Jan 1923

Some Food Reactions Of Snails, E. W. Johns

Proceedings of the Iowa Academy of Science

The following work was done at the University of Chicago Zoological Laboratory under the supervision of Dr. W. J. Crozier to investigate primarily the method of innervation of the food reflex. For the studies, various forms of common snails were experimented with, but the domestic snail known as the Singapore was used for most of this work because of its ready availability and suitableness for the work due to its large size, activity and omniverousness. The main objection to them is that they do not swim on the surface of the water as do many forms. In order to obviate …

Go to article

In Memoriam: Gustavus Detlef Hinrichs; James Edward Todd, Charles Keyes Jan 1923

In Memoriam: Gustavus Detlef Hinrichs; James Edward Todd, Charles Keyes

Proceedings of the Iowa Academy of Science

No abstract provided.

Go to article

The Role Of The Vagi Of Gastric Motility In Necturus Maculatus, T. L. Patterson Jan 1923

The Role Of The Vagi Of Gastric Motility In Necturus Maculatus, T. L. Patterson

Proceedings of the Iowa Academy of Science

Previous work on the movements of the empty stomach of the Necturus has indicated that the controlling influence of the vagi is largely inhibitory. This phenomenon is contrary to that which exists in the stomachs of higher animals, although it has been shown by Hopf for the frog and by Bercovitz and Rogers for the turtle that the tenth nerve contains both motor and inhibitory nerve fibres to the stomach with the motor predominating, at least in the frog.

Go to article

Synthetic Hypnotics In The Barbituric Acid Series, Arthur W. Dox Jan 1923

Synthetic Hypnotics In The Barbituric Acid Series, Arthur W. Dox

Proceedings of the Iowa Academy of Science

The increasing demand for sleep-producing drugs is perhaps one of the characteristics of the restless age in which we now live. Not a year passes but half a dozen new synthetic hypnotics appear in the patent literature and a few of these find their way into the drug market. Most of these fail to meet the claims made by the manufacturers and are soon discarded, and the physicians continue to prescribe the eight or ten more or less familiar drugs that have survived several decades of clinical experience. Meanwhile, the chemical and pharmaceutical laboratories continue their search for the ideal …

Go to article

Notes On The Occurrence Of A Black Bituminous Shale Near Palo, Linn County, Iowa, Glenn S. Dille Jan 1923

Notes On The Occurrence Of A Black Bituminous Shale Near Palo, Linn County, Iowa, Glenn S. Dille

Proceedings of the Iowa Academy of Science

The rock formations of Linn County belong to the Devonian period. During an examination with the possible exploitation of Devonian rock as a source of Portland Cement, Mr. A. S. Hammond and others of Cedar Rapids, Iowa, encountered in an excavation near Palo, Iowa, a black, bituminous shale. The shale is fine-grained and in places very bituminous. The layers vary in thickness from mere seams along bedding planes to an inch in thickness where exposed in the excavation, and lie at various depths below the surface in the valley of Little Bear creek. The presence of an old shaft …

Go to article

Some Fossils From An Outcrop In Des Moines, A. O. Thomas Jan 1923

Some Fossils From An Outcrop In Des Moines, A. O. Thomas

Proceedings of the Iowa Academy of Science

At the time of the meeting of the Iowa Academy of Science at Drake University, Des Moines, in April, 1922, the writer accompanied by Mr. Ben Hur Wilson made a brief visit to the clay pit of the Capital City Clay Company. This pit is located along the Chicago Great Western railroad tracks south of Raccoon river in the city of Des Moines and while perhaps the most extensive, is typical of similar exposures in the city. About thirty-five to forty feet of bluish shale and a few thin beds of sandstone and sandy shale are exposed and worked for …

Go to article

The Genus Empoasca In North America, Albert Hartzell Jan 1923

The Genus Empoasca In North America, Albert Hartzell

Proceedings of the Iowa Academy of Science

While the writer was connected with the Iowa Agricultural Experiment Station the potato leafhopper (Empoasca mali) appeared in immense numbers in the Upper Mississippi Valley. Investigations were carried on during the summers of 1919, 1920 and 1921 at Ames, Iowa, to establish definitely the relation of this insect to the disease it transmits, commonly called tipburn or hopperburn of potatoes, which was causing severe damage to the potato crop, and if possible devise means for its control. The difficulty experienced in separating closely related species of Empoasca, which had been confused by former investigators, led to the desire to trace …

Go to article

A Zoological Park In New Zealand, Dayton Stoner Jan 1923

A Zoological Park In New Zealand, Dayton Stoner

Proceedings of the Iowa Academy of Science

The University of Iowa Expedition to the South Seas participated in by six persons from that institution between May 14 and September 4, 1922, was undertaken largely for the purpose of making biological and geological collections and field observations. More than 17,000 miles were traversed of which something over 12,000 were by water. Of the total elapsed time-approximately 112 days-forty-five were spent in travel, after leaving the American continent, for the purpose of arriving at and returning from our objectives, Viti Levu of the Fiji Islands, where four weeks were spent, and the Dominion of New Zealand, where about …

Go to article

Food Of The Short-Nosed Gar-Pike (Lepidosteus Platystomus) In Lake Okoboji, Iowa, George E. Potter Jan 1923

Food Of The Short-Nosed Gar-Pike (Lepidosteus Platystomus) In Lake Okoboji, Iowa, George E. Potter

Proceedings of the Iowa Academy of Science

The food habits of any animal have a distinct bearing upon its life and so it is with the Gar-pike. In order to ascertain the kind and amount of food taken by this fish, many collections were made, stomachs dissected, the contents carefully examined and preserved.

Go to article

Observations On Sphenodon Punctatum In Captivity, Wendell Krull Jan 1923

Observations On Sphenodon Punctatum In Captivity, Wendell Krull

Proceedings of the Iowa Academy of Science

Sphenodon punctatum, known as the tuatara lizard by the natives of New Zealand, is the only living species of reptile included in the order Rhynchocephalia and is considered by scientists to be the most ancient representative of reptile-like animals now living. All the other representatives of the order are known only as fossils. The rhychocephalians possess so called "abdominal ribs" which foreshadow the plastron of the chelonians.

Go to article

The Flora Of The Olympic Peninsula, Washington, Albert B. Reagan Jan 1923

The Flora Of The Olympic Peninsula, Washington, Albert B. Reagan

Proceedings of the Iowa Academy of Science

No list of the plants of the Olympic Peninsula has ever been published so far as the writer can learn. This paper covers observations ranging over a period of five years while the writer had charge of the Quillayute and Hoh Indians of that peninsula. His observations, here recorded, also give the uses to which the Indians of the coast apply the plants

Go to article

Plants And The Surface Film Of Water, Robert B. Wylie Jan 1923

Plants And The Surface Film Of Water, Robert B. Wylie

Proceedings of the Iowa Academy of Science

The plant's uses of water are many. As a solvent water permits the absorption of raw materials of all kinds taken in by the plant. Within the plant body water performs many functions, some of it even entering into the constitution of the protoplasm itself. In leaving the plant in the form of vapor its evaporation cools the tissues when otherwise they might at times be injured by the radiant energy of the sun to which extensive portions of the plant must he exposed for photosynthesis. The familiar root-shoot type of land vegetation is the form-response of plants to the …

Go to article

Extracts Form The Experiences Of A Well Digger, J. M. Lindly Jan 1923

Extracts Form The Experiences Of A Well Digger, J. M. Lindly

Proceedings of the Iowa Academy of Science

Nature seems to hold her secrets for those who seek them. An investigation of the earth's surface oft-times reveals the unexpected. Even the experiences of the man who penetrates the earth by digging, by boring, or by drilling, whose object is to find a supply of water, may include incidents worthy of more than a mere passing notice.

Go to article

Fossil Annelid Jaws From The Iowa Devonian, Walter V. Searight Jan 1923

Fossil Annelid Jaws From The Iowa Devonian, Walter V. Searight

Proceedings of the Iowa Academy of Science

Recently in the process of experiment on limestones from the Cedar Valley formation near Iowa City, Iowa, 0.5 n. hydrochloric acid was used to decompose the carbonates present. In the residues obtained by filtration and washing of the resulting product there were discovered some organic remains almost microscopic in size which were very similar in appearance to those of the jaws of certain groups of recent marine annelids. Further investigations revealed several complete specimens and a number of fragments which show that these remains probably are distributed quite generally through the Cedar Valley limestones. They are now known to occur …

Go to article

Officers, Past Presidents, And Members, Iowa Academy Of Science Jan 1923

Officers, Past Presidents, And Members, Iowa Academy Of Science

Proceedings of the Iowa Academy of Science

No abstract provided.

Go to article

On The Function Of The Paddle Of The Paddlefish, H. W. Norris Jan 1923

On The Function Of The Paddle Of The Paddlefish, H. W. Norris

Proceedings of the Iowa Academy of Science

There is a popular notion that the Paddlefish (Polyodon spathula) uses its paddle or snout as an organ of excavation in its search for food. Examination and consideration of the composition and texture of this organ ought to lead one to question the correctness of the popular opinion. The snout or rostrum of the common sturgeons may well be an organ of excavation, armed and protected as it is with bony plates, but the rostrum of the paddlefish is covered with a soft naked skin. Stockard (1907) has given us a very thorough and enlightening account of the …

Go to article

Fish Foods In Relation To Fish Culture, Willis De Ryke Jan 1923

Fish Foods In Relation To Fish Culture, Willis De Ryke

Proceedings of the Iowa Academy of Science

The necessity for a solution to the fish culture problem was long ago felt in the crowded districts of Europe. The economic demand that food be produced for the ever increasing population of these districts resulted in directing attention to the comparatively waste small inland ponds and lakes, once plentifully inhabited by food fish but now almost completely exhausted. It was to meet this situation, then, that the pioneer fish culturists began working at methods to raise the waste waters to their former degree of productive usefulness in yielding food.

Go to article

Vitamin Deficiency Studies : 1. The Relation Of Vitamin Deficiency To Muscle Fatigue In Rats, V. E. Nelson, F. M. Baldwin, Anna Gertrude Riggs, Marjorie Cunningham Jan 1923

Vitamin Deficiency Studies : 1. The Relation Of Vitamin Deficiency To Muscle Fatigue In Rats, V. E. Nelson, F. M. Baldwin, Anna Gertrude Riggs, Marjorie Cunningham

Proceedings of the Iowa Academy of Science

When the physiological performances of vitamin deficient rats are analyzed in conjunction with growth curves and other data, certain relationships are apparent. Fatigue curves produced by animals lacking vitamin B show progressive diminution in amplitude and endurance as the length of time on diet increases. These curves also show progressive loss of tonicity and an irregularity of contraction that seem very characteristic. Animals lacking vitamin A show similar curves which in amplitude and duration are roughly inversely proportional to the interval upon the diet but the decrease in tonicity is not so apparent. At the time the animals were used, …

Go to article

Comparative Rates Of Oxygen Consumption In Marine Forms, Francis M. Baldwin Jan 1923

Comparative Rates Of Oxygen Consumption In Marine Forms, Francis M. Baldwin

Proceedings of the Iowa Academy of Science

The present paper presents data gathered by the writer in a study made on the rate of oxygen consumption in some of the marine fishes and invertebrates, and gives additional weight to a report by Professor Scott before the Society of Experimental Biology, XII, pp. 146-147.

Go to article

Notes On Introduced Plants, Robert B. Wylie Jan 1923

Notes On Introduced Plants, Robert B. Wylie

Proceedings of the Iowa Academy of Science

Unexpected results frequently follow the introduction of plants and animals into new regions. The transplanted organism often shows unusual vigor and may become a disturbing factor in the new home where it may not even perform the intended service. Since the introduced form frequently leaves behind its worst enemies or chief competitors it sometimes develops amazingly in the new environment.

Go to article

Citation Of Authorities For Latin Names, Henry S. Conard Jan 1923

Citation Of Authorities For Latin Names, Henry S. Conard

Proceedings of the Iowa Academy of Science

To what extent is it significant to cite the names of authorities after the latin names of plants and animals? This is an old question but one which, it seems to me, is not yet fully settled. What is the best practice for you and for me? Three methods of citation are in current use. Some cite only the originator of the combination of genus and species, as in Bailey's Standard Cyclopedia of Horticulture (Nupar luteum, Sibth. and Smith). Others cite always the originator of the specific name, followed by the author of the combination when that is by another …

Go to article

Sociology As A Science, Hornell Hart Jan 1922

Sociology As A Science, Hornell Hart

Proceedings of the Iowa Academy of Science

The term "social science" appears to be taken seriously neither by scientists nor by sociologists. Conditions in social research have justified that lack of confidence, but an increasing group has set about the systematic collection of data on specific social problems and is reaching results capable of objective verification. Three recent studies of the Sociological Division of the Iowa Child Welfare Research Station illustrate this tendency. One of these measures and describes by statistical methods the selective emigration which threatens to impoverish socially certain rural areas of the state. A second study develops by means of partial regression equations the …

Go to article

First Prev Next Last