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Articles 53491 - 53520 of 53612
Full-Text Articles in Life Sciences
Forests And Glaciers Of Southern Alaska, William S. Cooper
Forests And Glaciers Of Southern Alaska, William S. Cooper
Journal of the Minnesota Academy of Science
No abstract provided.
Amoeba, External Parasites On Hydra, Wendel Luetmer
Amoeba, External Parasites On Hydra, Wendel Luetmer
Journal of the Minnesota Academy of Science
No abstract provided.
Gypsum - Its Value To Texas, May L. Whitsitt
Gypsum - Its Value To Texas, May L. Whitsitt
Field and Laboratory
"Gyp" water is for many people the only means of acquaintance with gypsum. A grayish deposit in the tea kettle and the difficulties encountered when "gyp" water is used for laundering do not serve as a fitting introduction to the beautiful alabaster of the Taj Mahal. For alabaster is gypsum, too. There are still other forms of gypsum which are making this mineral increasingly important.
Dinosaur Track Mounted In The Band Stand At Glen Rose, Texas, Ellis W. Shuler
Dinosaur Track Mounted In The Band Stand At Glen Rose, Texas, Ellis W. Shuler
Field and Laboratory
Dinosaur tracks have been reported from at least nine localities in Hood County, Texas. All tracks occur in the Glen Rose limestone. The vertical range of the tracks is very limited so far as present studies go. Locally, the tracks are known as "bird tracks". One locality near the county seat, Glen Rose, was described in 1917. Recently a superb dinosaur track was taken from the "fourth crossing" of the Paluxy River about six miles west of the town of Glen Rose and placed by the citizens of the community in the base of the bandstand located in the court …
Charles Wright's 1849 Botanical Collecting-Trip From San Antonio To El Paso; With Type-Localities For New Species, S. W. Geiser
Charles Wright's 1849 Botanical Collecting-Trip From San Antonio To El Paso; With Type-Localities For New Species, S. W. Geiser
Field and Laboratory
In the spring of 1849, Lt. William Farrar Smith, of the Corps of Topographical Engineers, U. S. A., discovered a southern route between San Antonio and El Paso.
Additional Data On Feeding Habits Of The Short-Eared Owl, Claude Kelly
Additional Data On Feeding Habits Of The Short-Eared Owl, Claude Kelly
Field and Laboratory
During January, 1935, forty large owl pellets were collected from the roosting site of a colony of approximately eighty short-eared owls, located along the northwestern marshy edge of White Rock Lake, near Dallas, Texas. The owls had occupied the area for a period of nearly two months during their migration. Each of the forty pellets collected was broken up by washing, the bones removed, placed in numbered boxes and sent to the Division of Wild Life Research, U.S. Bureau of Biological Survey, for analysis.
The Growth Of Dallas From 1850 To 1930, Edwin J. Foscue
The Growth Of Dallas From 1850 To 1930, Edwin J. Foscue
Field and Laboratory
With the Texas Centennial being held in Dallas next summer, and emphasis being placed upon the development and growth of the state throughout the period, it seems fitting to trace briefly the growth of the centennial city even though it be only ninety-five years old at the time.
Histological Changes In The Liver Of Salamanders During Starvation, Jean Stevenson
Histological Changes In The Liver Of Salamanders During Starvation, Jean Stevenson
Field and Laboratory
The purpose of the present paper is to present briefly observations made on the microscopic structure of the liver of the salamander, Ambystoma maculatum, during inanition.
Terraces Of The Trinity River, Dallas County, Texas, Ellis W. Shuler
Terraces Of The Trinity River, Dallas County, Texas, Ellis W. Shuler
Field and Laboratory
This introductory paper presents the larger facts concerning the terraces of the Trinity River in Dallas County, and points out some of the more important problems to be solved in future studies. Individual problems will be assigned to advanced students of Geology in the department. Mr. Lewis Kelsey presents the first of such studies in this issue.
Duststorms In The Southwest, John D. Boon
Duststorms In The Southwest, John D. Boon
Field and Laboratory
During the last few months there have [been] many duststorms in the southwestern part of the United States. Almost every day the newspapers have carried stories of these disturbances. It is difficult to tell whether or not these storms are becoming more frequent than they were in the early days, since accurate records of their occurrence and severity are of recent origin. However, there are some very definite reasons for thinking that they are becoming more frequent.
The Marsalis Terrace: A High Level Terrace Of The Trinity River, Dallas, Texas, Lewis Kelsey
The Marsalis Terrace: A High Level Terrace Of The Trinity River, Dallas, Texas, Lewis Kelsey
Field and Laboratory
The highest terrace of the Trinity River at Dallas on the Oak Cliff side of the river is named for Marsalis Avenue because of its extensive development along that thoroughfare. The Marsalis Terrace occurs in two well developed areas in Oak Cliff. Lake Cliff Branch divides the two sections and has eroded the central part of the terrace. The larger area of the Marsalis Terrace lies on the southwest side of Lake Cliff Branch. The second area lies in the vicinity of the Methodist Hospital on the northeast side of the Lake Cliff Branch.
Photo-Electric Cell Demonstration, Andrew Hilderbrand
Photo-Electric Cell Demonstration, Andrew Hilderbrand
Field and Laboratory
The demonstration apparatus shown diagrammatically in the accompanying drawing was assembled as part of a physics exhibit for Engineer's Day. Essentially it is a photo-electric cell relay device using a one stage vacuum tube amplifier.
Determination Of The Ratio Of Specific Heats Of A Gas By Method Of Clement And Desormes, J. C. Carpenter
Determination Of The Ratio Of Specific Heats Of A Gas By Method Of Clement And Desormes, J. C. Carpenter
Field and Laboratory
No abstract provided.
Notes
Field and Laboratory
The Groundhog As A Weather Forecaster; Two Leading Chemists Visit Southern Methodist University; The Chemistry Club; Central Texas Section, American Chemical Society Meets At Southern Methodist University; Oberholser Lectures At Southern Methodist University
A Slime Mould Collection For Comparison And Identification, Mayne Longnecker
A Slime Mould Collection For Comparison And Identification, Mayne Longnecker
Field and Laboratory
The University of Iowa has long been known as a center of mycological study….In order that more intelligent work may be done in various parts of the country in the classification of the myxomycetes, and for the purpose of stimulating interest in them, Professor [George W.] Martin is assembling a few collections of representative forms from the herbarium at the University of Iowa, and placing these in the hands of interested individuals at strategic and widely separated locations….It is the good fortune of the department of biology of Southern Methodist University to have received one of these collections for use …
An Old Experiment Carried A Step Further, John D. Boon
An Old Experiment Carried A Step Further, John D. Boon
Field and Laboratory
An old experiment described in almost every elementary college text book that has been issued for years, illustrates how the boiling point of water may be reduced to room temperatures by boiling a small amount of water in a flask until the air has been carried out by the steam, then putting a stopper in the flask and holding it under a stream of cold water, thus condensing the steam and producing a partial vacuum….Why authors of texts do not carry this experiment a step further and reduce the boiling point to the triple point is difficult to understand.
The Interrelationships Of Bark Beetles And Blue-Staining Fungi In Felled Norway Pine Timber, J. G. Leach, L. W. Orr, Clyde Christensen
The Interrelationships Of Bark Beetles And Blue-Staining Fungi In Felled Norway Pine Timber, J. G. Leach, L. W. Orr, Clyde Christensen
Journal of the Minnesota Academy of Science
A study of two species of bark beetle (lps pini Say and I. grandicollis Eichh.) and the fungi associated with them has been made as the first part of a general investigation of the interrelations of insects and fungi in the deterioration of felled logs of Norway pine.
Molasses-Agar: A Useful Medium For The Cultivation Of The Genus Monilia, Hardy A. Kemp, Sol Haberman
Molasses-Agar: A Useful Medium For The Cultivation Of The Genus Monilia, Hardy A. Kemp, Sol Haberman
Field and Laboratory
Species of the genus Monilia are easily cultivated between the temperatures of 22°C and 38°C on solid media of slightly acid reaction. After cultivating stock strains of Monilia albicans and Monilia psilosis on Sabouraud's medium, honey agar, and molasses agar, it was found that molasses agar afforded the best means for cultivating these Oosporaceae.
Biometrical Study Of Goniobasis Comalensis Pilsbry From Two Diverse Habitats, Elmer P. Cheatum, E. D. Mouzon, Jr.
Biometrical Study Of Goniobasis Comalensis Pilsbry From Two Diverse Habitats, Elmer P. Cheatum, E. D. Mouzon, Jr.
Field and Laboratory
Much has been written on the part played by the environment in changing secondary characters of the more plastic invertebrates….During February, 1934, a collecting trip was made to San Marcos, Texas, where two contrasting aquatic habitats were found, both of which were inhabited by the branchiate snail Goniobasis comalensis. Several hundred individuals were collected from each habitat, the shells measured, and a statistical study made of size differences.
Collecting Fossil Elephants At Dallas, Texas, Ellis W. Shuler
Collecting Fossil Elephants At Dallas, Texas, Ellis W. Shuler
Field and Laboratory
That man was co-existent with the mastodon and mammoth in Europe is well established. Many geologists and archaeologists are convinced that man lived in North America during the Pleistocene but the belief is by no means universal. Certainly the archaeologist has a definite interest in the search for fossil elephants and for any evidence of their association with man….Elephants were widespread and numerous in Texas during the Pleistocene.
Rainfall On The Western Front During The World War, Edwin J. Foscue
Rainfall On The Western Front During The World War, Edwin J. Foscue
Field and Laboratory
Within the last fifty years many attempts have been made to produce rain by artificial means, but all have resulted in failures. The unusually dry summer of 1934 in central United States, from North Dakota to Texas, produced a new group of rainmakers and rain-making experiments. The details of their plans differed somewhat, but all worked on the so-called "concussion theory" that the detonation of high explosives in the upper atmosphere would produce rain. In each case claims were supported by the commonly accepted statement that rain always followed battles, and that the unusually heavy rain in France along the …
Further Observations On The Sex-Ratios Of Terrestrial Isopods, S. W. Geiser
Further Observations On The Sex-Ratios Of Terrestrial Isopods, S. W. Geiser
Field and Laboratory
Vandel contends that in terrestrial isopods the females are more numerous than males in collections. He gives tables showing the sex-ratios of collections of ten species…. Although Vandel finds that the sex-ratios of adult collections are one-sided in favor of the female sex, he nevertheless finds that in cultures of the species which he made, the sexes were about equally represented at birth, and in young populations. This accords with the findings of the present writer, who found the sexes approximately equal in very young populations of Armadillidium vulgare and Porcellio laevis.
The Ruffle Plant Again In Limpia Creek, Mayne Longnecker
The Ruffle Plant Again In Limpia Creek, Mayne Longnecker
Field and Laboratory
For the first time in thirty-two years the ruffle plant, Riella americana, rare American liverwort, has been collected in Limpia Creek, in the Davis Mountains of western Texas.
A Student Experiment In The Measurement Of Vapor Pressure, Fitzhugh Marshall
A Student Experiment In The Measurement Of Vapor Pressure, Fitzhugh Marshall
Field and Laboratory
The purpose of this experiment was to determine the changes in the vapor pressure of benzene with changes in temperature; and from these data to derive a vapor pressure-temperature curve.
That First Texas Botanist, S. W. Geiser
That First Texas Botanist, S. W. Geiser
Field and Laboratory
Winkler, in his useful account of botanical investigations in Texas, states (p. 5) that Jean Louis Berlandier, a French botanist in the employ of the Mexican Government, was the first to explore Texas botanically, while connected (1828) with the Comision de Limites under General Mier y Teran. In the present writer's own published studies, this statement was repeated, since the collections of Dr. Edwin James while a member of Long's Rocky Mountain Expedition (1819-20) were made in territory not a part of the historic province of Texas, but of Chihuahua, as maps of the period will show. In the modern …
The Blanton Student Observatory, John D. Boon
The Blanton Student Observatory, John D. Boon
Field and Laboratory
All of the large observatories, that have been constructed in recent years, are located in high and dry altitudes where the sky is almost always clear and the atmosphere is steady. It is a useless waste of money to locate a large telescope where climatic conditions are unfavorable…. The situation is quite different when it comes to the construction of small student observatories such as are found on the campus of many of the universities. Every city as large as Dallas, no matter what the atmospheric conditions may be, should have one or more small observatories where students may learn …
Vitamin B(B,) And G(B2) Content Of Cottonseed Products, May L. Whitsitt
Vitamin B(B,) And G(B2) Content Of Cottonseed Products, May L. Whitsitt
Field and Laboratory
Cotton is a raw material which is more and more closely allying the agricultural and chemical industries. Because of the considerable industrial importance of cotton to the South and because of the recognized nutritional value of cottonseed meal in cattle feeding, a study of cottonseed products has been undertaken in order to learn more of their possibilities as nutrients. Stevens (8) in 1930 reported his finding that cottonseed meal was a rich source of both vitamins B(B), and G(B2). This investigation has for its object a comparative study of cottonseed meal, oil, and hulls with respect to their vitamin B …
The Magnetic Field Between A Double Coil, Frank C. Mcdonald
The Magnetic Field Between A Double Coil, Frank C. Mcdonald
Field and Laboratory
One method of obtaining a uniform magnetic field is by means of a double coil. This consists of two coaxial coils, such as those used in the Helmholtz galvanometer.
Notes On Texas Crustacea, S. W. Geiser