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

Life Sciences Commons™

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

Journal

Discipline
Institution
Keyword
Publication Year
Publication
File Type

Articles 53521 - 53550 of 53612

Full-Text Articles in Life Sciences

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.

Go to article

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.

Go to article

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.

Go to article

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.

Go to article

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.

Go to article

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.

Go to article

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.

Go to article

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.

Go to article

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

Go to article

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.

Go to article

A Comparison Of Hardness In Dallas Water Before And After Treatment In The City Water Plant, W. D. Frazell, Henry Lewelling Nov 1933

A Comparison Of Hardness In Dallas Water Before And After Treatment In The City Water Plant, W. D. Frazell, Henry Lewelling

Field and Laboratory

A measurement of the change in hardness produced in raw water by the usual treatment in the city purification plant of Dallas, Texas, was a project undertaken by the class in elementary quantitative analysis. The treatment which would affect the hardness was the addition of ferrous sulphate and lime at the time the water was pumped into the settling basins, and filtration through gravel. In making this comparison, the total alkalinity, temporary hardness, and permanent hardness of raw water and water after treatment, were determined. Raw water samples were taken as the water entered the purification plant; samples of treated …

Go to article

A Geographic Study Of The Carrollton Area, Robert C. Dunlap, Claude C. Albritton Jr. Nov 1933

A Geographic Study Of The Carrollton Area, Robert C. Dunlap, Claude C. Albritton Jr.

Field and Laboratory

The Carrollton Area, as considered in this paper, includes approximately seventy square miles in the northwestern corner of Dallas County. Two small towns, Carrollton (popu­ lation 689) and Farmers Branch (population 400), were im­ portant centers in the early days of settlement, but the rapid growth of Dallas, a few miles to the southeast, has delegated to these communities the roles of satellites to the larger urban center. Three railroads intersect at Carrollton, and both towns are on the Dallas-Denton paved highway.

Go to article

On The Type Localities Of Certain Texas Phyllopoda, S. W. Geiser Apr 1933

On The Type Localities Of Certain Texas Phyllopoda, S. W. Geiser

Field and Laboratory

Packard, in the August, 1871, issue of Silliman's journal, published a number of new species of phyllopod crustacea, among which were five from Texas, namely, Limnetis gracilicornis, Estheria belfragei, Limnadia (Eulimnadia) texana, Streptocephalus texanus, and Apus aequalis.

Go to article

An Epistemology, John D. Boon Apr 1933

An Epistemology, John D. Boon

Field and Laboratory

Our world lies midway between the stellar world above and the subatomic world below. It would be difficult to conceive of a more favorable position for a race that seeks to comprehend the material universe. This position makes it possible to look both upward and downward, and to use both telescopes and microscopes in obtaining empirical evidence upon which to build theoretical conclusions. A few years ago it might have been claimed that this midway position is more apparent than real; that by mere chance men had gone equal distance into things that were above and below their world; that …

Go to article

Variation In The Parasitic Worm, Ascaridia Lineata, From Dallas County, Texas, Francis Marion Adams Apr 1933

Variation In The Parasitic Worm, Ascaridia Lineata, From Dallas County, Texas, Francis Marion Adams

Field and Laboratory

In the course of a recent study of the helminth parasites of domestic fowl in Dallas County, certain interesting variations were observed in the number and distribution of the caudal papillae of one of the parasites, Ascaridia lineata (Schneider). These are described below and illustrated in the accompanying figures.

Go to article

A Comparison Of Commercial And Crude Samples Of Sodium Chloride, Jean Horace Sullivan Apr 1933

A Comparison Of Commercial And Crude Samples Of Sodium Chloride, Jean Horace Sullivan

Field and Laboratory

The object of the experiment was to compare the relative purity of several brands of table salt with crude sodium chloride as it comes from the mines. The comparison was made by a gravimetric determination of the chlorine as silver chloride. Two commercial samples obtained from the local stores were compared with a crude sample from Jefferson Island mine.

Go to article

The Silvan Flora Of The White Rock Lake Region With Reference To Soil Types, Landon H. Baker Apr 1933

The Silvan Flora Of The White Rock Lake Region With Reference To Soil Types, Landon H. Baker

Field and Laboratory

White Rock Lake, lying at the east border of the City of Dallas, has been the focus of considerable biological study during the past few years, and the writer has been especially interested in the trees growing in the region. In this connection the question arose as to whether or not a correlation might exist between the species of woody plants found in the locality, and the physical and chemical structure of the various soils of the vicinity. The recently completed Soil Survey of Dallas County offers data upon the origin and nature of these soils, and these have been …

Go to article

A Case Of Congenital Aphalangia In Man, Mayne Longnecker Apr 1933

A Case Of Congenital Aphalangia In Man, Mayne Longnecker

Field and Laboratory

An interesting case involving an incompletely developed left manus came to the writer's attention some time ago. The third, fourth, and fifth digits were entirely missing, save for small fleshy outgrowths; the index was about one and a half centimeters long, and obviously contained a bone, while the thumb appeared to be only about a centimeter shorter than the thumb on the subject's other and normal hand. The wrist seemed to possess an unusual degree of flexibility, and the left arm was normal, although of slightly less circumference than the right, the difference being probably due to its less use.

Go to article

Longhorn Cavern, A Reconnaissance Survey, H. M. Law Apr 1933

Longhorn Cavern, A Reconnaissance Survey, H. M. Law

Field and Laboratory

The recent opening of the Longhorn Cavern, twelve miles south of the town of Burnet, in the "Central Mineral Region" of Texas, as a state park, has given this fine cave known by local residents for almost a hundred years, state and national interest.

Go to article

Aerial Reconnaissance Mapping Of Land Utilization, Claude C. Albritton Jr. Apr 1933

Aerial Reconnaissance Mapping Of Land Utilization, Claude C. Albritton Jr.

Field and Laboratory

Within the last year, the Department of Geology and Geography of Southern Methodist University has initiated a series of land utilization studies for Dallas County. The survey divides the county into thirty areas of approximately thirty square miles each. The first two areas assigned, located in the northwest corner of the county, embracing about sixty-five square miles, contain two small urban centers, Farmers Branch (population 400), and Carrollton (population 689). In the course of field work on the assigned areas, the authors felt that an aerial reconnaissance might expedite the survey and an airplane trip was arranged to cover the …

Go to article

Notes, Corrections, Alumnae Notes Apr 1933

Notes, Corrections, Alumnae Notes

Field and Laboratory

No abstract provided.

Go to article

Multiple Internal Reflection In A Prism, Fitzhugh Marshall Jr. Nov 1932

Multiple Internal Reflection In A Prism, Fitzhugh Marshall Jr.

Field and Laboratory

In using the spectrometer for determining the index of refraction of a prism by the well-known method of minimum deviation, frequently a line is observed which does not follow the motion of the spectrum as a whole.

Go to article

Equipping A Vitamin Laboratory On Depression Funds, May L. Whitsitt Nov 1932

Equipping A Vitamin Laboratory On Depression Funds, May L. Whitsitt

Field and Laboratory

The spending of a sum of money for research purposes in days of decreased and declining income takes on the air of a real adventure. When given the opportunity of undertaking a research problem in the field of vitamin investigation the writer eagerly set out to see how far funds could be extended.

Go to article

Lingual Deposition In The Woodbine Sands Along Copperas Branch, Denton County, Texas: A Study In Marine Sedimentation, Ellis W. Shuler Nov 1932

Lingual Deposition In The Woodbine Sands Along Copperas Branch, Denton County, Texas: A Study In Marine Sedimentation, Ellis W. Shuler

Field and Laboratory

The lack of outcrops in three dimensions often limits the interpretation and understanding of sedimentary structures, the relation of transition beds, and the cycle of sedimentation. The low dips of the Woodbine sands in Denton County, Texas, together with the numerous outcrops in the miniature canyons of Hickory Creek, Bethel and Copperas Branches, offer an unusual opportunity for studies in the sedimentation of these sands.

Go to article

A Planetarium, John D. Boon Nov 1932

A Planetarium, John D. Boon

Field and Laboratory

Few people, even among college graduates, have a clear conception of the structure of the Solar System. Perhaps there are two reasons why this is true. In the first place, our educational system is so organized that there is little room for courses in astronomy, either in the high school or college curriculum. In the second place, it is not easy to get the true conception of the Solar System without a mechanical model, and mechanical models of the sun and its family are difficult to construct. In order that the students of Southern Methodist University might obtain a more …

Go to article

The Frequency Of Occurrence Of Albinism In Terrestrial Isopods, S. W. Geiser Nov 1932

The Frequency Of Occurrence Of Albinism In Terrestrial Isopods, S. W. Geiser

Field and Laboratory

The well-known British geneticist, Professor F. A. E. Crew, of the University of Edinburgh, in a plate illustrating his article, "Albino," in the fourteenth edition of the Encyclopaedia Britannica, gives an excellent figure showing albinism in the common European lobster, Homar1lS gammarus (L.). This unusual figure and record, as one of the few reported cases of albinism among the Crustacea, deserves more than passing comment.

Go to article

A Note On The Calculus Of The Distribution Of Genetic Characters In Crosses Involving Linkage, S. W. Geiser Nov 1932

A Note On The Calculus Of The Distribution Of Genetic Characters In Crosses Involving Linkage, S. W. Geiser

Field and Laboratory

Teachers of genetics will welcome a simplified method for the calculation of the segregation of characters in crosses involving linkage, over the old, laborious method now in use.

Go to article

The Natural Vegetation Of The Lower Rio Grande Valley Of Texas, Edwin J. Foscue Nov 1932

The Natural Vegetation Of The Lower Rio Grande Valley Of Texas, Edwin J. Foscue

Field and Laboratory

The Lower Rio Grande Valley, as considered in this paper, occupies the American side of the Rio Grande delta in the extreme southern part of Texas, between latitudes 25 degrees 50 minutes and 26 degrees 50 minutes. The area lies within three degrees of the Tropic of Cancer. The Lower Rio Grande Valley, as considered in this paper, occupies the American side of the Rio Grande delta in the extreme southern part of Texas, between latitudes 25 degrees 50 minutes and 26 degrees 50 minutes. The area lies within three degrees of the Tropic of Cancer. Although favored with a …

Go to article

Field And Laboratory, Notes Nov 1932

Field And Laboratory, Notes

Field and Laboratory

With the belief that the discipline of writing and the possibility for publication will promote a spirit of research, Field and Laboratory begins with this issue as a semi­annual magazine devoted to the publication of the results of work done by students and teachers of science in Southern Methodist University. The articles in this issue include the records of experiments conducted in the Physics, Biology, and Chemistry laboratories, and of field studies in Geology and Geography. As the magazine is sponsored by the entire science group, articles will of necessity be varied in character; it is planned to include in …

Go to article

Front Matter May 1917

Front Matter

Journal of the Minnesota Academy of Science

The last address of the late Newton Horace Winchell. Originally presented before the Iowa Academy of Sciences, at Cedar Falls, Iowa, April 24, 1914.

Go to article

First Prev Next Last