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Articles 53791 - 53820 of 53902

Full-Text Articles in Life Sciences

The Marsalis Terrace: A High Level Terrace Of The Trinity River, Dallas, Texas, Lewis Kelsey Apr 1935

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.

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Photo-Electric Cell Demonstration, Andrew Hilderbrand Apr 1935

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.

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Determination Of The Ratio Of Specific Heats Of A Gas By Method Of Clement And Desormes, J. C. Carpenter Apr 1935

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.

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Notes Apr 1935

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

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A Slime Mould Collection For Comparison And Identification, Mayne Longnecker Apr 1935

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 …

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An Old Experiment Carried A Step Further, John D. Boon Apr 1935

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.

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The Interrelationships Of Bark Beetles And Blue-Staining Fungi In Felled Norway Pine Timber, J. G. Leach, L. W. Orr, Clyde Christensen Jan 1935

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.

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Molasses-Agar: A Useful Medium For The Cultivation Of The Genus Monilia, Hardy A. Kemp, Sol Haberman Nov 1934

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.

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Biometrical Study Of Goniobasis Comalensis Pilsbry From Two Diverse Habitats, Elmer P. Cheatum, E. D. Mouzon, Jr. Nov 1934

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.

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Collecting Fossil Elephants At Dallas, Texas, Ellis W. Shuler Nov 1934

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.

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Rainfall On The Western Front During The World War, Edwin J. Foscue Nov 1934

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 …

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Further Observations On The Sex-Ratios Of Terrestrial Isopods, S. W. Geiser Nov 1934

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.

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The Ruffle Plant Again In Limpia Creek, Mayne Longnecker Nov 1934

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.

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A Student Experiment In The Measurement Of Vapor Pressure, Fitzhugh Marshall Nov 1934

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.

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That First Texas Botanist, S. W. Geiser Nov 1934

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 …

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The Blanton Student Observatory, John D. Boon Nov 1934

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 …

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Alumni Notes Nov 1934

Alumni Notes

Field and Laboratory

No abstract provided.

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Vitamin B(B,) And G(B2) Content Of Cottonseed Products, May L. Whitsitt Apr 1934

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 …

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The Magnetic Field Between A Double Coil, Frank C. Mcdonald Apr 1934

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.

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Notes On Texas Crustacea, S. W. Geiser Apr 1934

Notes On Texas Crustacea, S. W. Geiser

Field and Laboratory

No abstract provided.

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Type Collection Of The Writings Of Robert T. Hill, Ellis W. Shuler Apr 1934

Type Collection Of The Writings Of Robert T. Hill, Ellis W. Shuler

Field and Laboratory

Dr. Robert T. Hill has signally honored the Geological Department of Southern Methodist University by donating to its library the type collection of his writings with an index and annotated bibliography. This collection covers the writings of one of America's leading geologists over a period of nearly half a century. Interesting and valuable in every phase of geology, it is the court of final reference for the student of the history of Texas stratigraphy.

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A.A.P.G. Meeting At Dallas, Ellis W. Shuler Apr 1934

A.A.P.G. Meeting At Dallas, Ellis W. Shuler

Field and Laboratory

Geology students of Southern Methodist University found a rare opportunity in attending the annual meeting of the American Association of Petroleum Geologists in Dallas, March 21-24, 1934. This meeting brought together more than 1500 professional geologists, world wide in distribution. The Association is one of the largest and strongest of scientific bodies. Its publications and programs are of outstanding interest in the field of geology. The program for 1934 was one of unusual merit and was distinguished by the number of papers on geological principles and pure science rather than applied geology.

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An Annotated List Of The Snails Of Dallas County, Texas (Concluded), Elmer P. Cheatum, Charles E. Burt Apr 1934

An Annotated List Of The Snails Of Dallas County, Texas (Concluded), Elmer P. Cheatum, Charles E. Burt

Field and Laboratory

No abstract provided.

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The Distribution Of Pectinatella Magnifica Leidy In The United States, S. W. Geiser Apr 1934

The Distribution Of Pectinatella Magnifica Leidy In The United States, S. W. Geiser

Field and Laboratory

In 1851, Leidy described from the Schuylkill River near Philadelphia, the interesting Bryozoan, Pectinatella magnifica. Since then, it has been recorded from a number of other localities in America and Europe. The exact distribution, however (for America, at least) is still only partially known. Brown1 has recently published a careful study of the biology of this species; and the present writer has studied, since 1928, the distribution of this species in Iowa, as well as its periodicity of abundance.

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The Distribution Of Population In The Lower Rio Grande Valley Of Texas, Edwin J. Foscue Apr 1934

The Distribution Of Population In The Lower Rio Grande Valley Of Texas, Edwin J. Foscue

Field and Laboratory

The Lower Rio Grande Valley of Texas represents one of the most densely populated areas of southwestern United States. Its average density, 40.9 people per square mile, is nearly twice that for the state as a whole. The four counties of the Valley area include large tracts of nearly vacant ranch country. Were figures available for the irrigated area alone, the average density per square mile would be much greater.

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Notes On Texas Crustacea, S. W. Geiser Nov 1933

Notes On Texas Crustacea, S. W. Geiser

Field and Laboratory

The accumulation, during the past few years, of data relative to the occurrence in Texas of species of Crustacea not credited, in the usual handbooks, to our fauna, has induced the present writer to assemble in a brief note such observations as seem of particular interest.

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Inspiration Point, Ellis W. Shuler Nov 1933

Inspiration Point, Ellis W. Shuler

Field and Laboratory

Inspiration Point, a headland overlooking the entrenched Brazos River, near Mineral Wells, Palo Pinto County, Texas, is the western end of an annual geological field trip made by students of Southern Methodist University. This article is an attempt to interpret and to give meaning to this beautiful landscape.

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An Annotated List Of The Snails Of Dallas County Texas, Elmer P. Cheatum, Charles E. Burt Nov 1933

An Annotated List Of The Snails Of Dallas County Texas, Elmer P. Cheatum, Charles E. Burt

Field and Laboratory

Although great advances have been made in the study of many groups of Texas animals, the knowledge of the Mol­lusca is still very meager....[I]t is apparent that the study of Texas snails is only just begun and that there exists a need for careful and continued collecting in numerous counties. A molluscan survey of indi­vidual counties has been started by the senior author with the hope of ultimately bringing together a large mass of data to support a comprehensive and authentic treatment of the snails of Texas.

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Chicle Exploitation In The Sapodilla Forest Of The Yucatan Peninsula, Cyrus Longworth Lundell Nov 1933

Chicle Exploitation In The Sapodilla Forest Of The Yucatan Peninsula, Cyrus Longworth Lundell

Field and Laboratory

The dominant forest tree of the virgin bush areas of the Yucatan Peninsula is the sapodilla, Achras Zapota L., important commercially as the source of chicle, the basis of chewing gum. From Cape Catoche to Lake Peten it is one of the most frequent species, characterizing this limestone region, which is a phytogeographic unit with a typical flora

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A Simplified Method For The Preparation Of Butyric Acid, Lallance A. Adair, E. J. Simmons Nov 1933

A Simplified Method For The Preparation Of Butyric Acid, Lallance A. Adair, E. J. Simmons

Field and Laboratory

As an elective experiment in the class in organic preparations it was decided to make pure butyric acid from n-butyl acetate. To accomplish this the plan followed was (1) the hydrolysis of the ester to obtain n-butyl alcohol, (2) the oxidation of the alcohol to the acid, and (3) the separation of the acid from the mixture.

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