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Concerning The Capacity Of Foliage Leaves To Withstand Wounding, Robert B. Wylie

Proceedings of the Iowa Academy of Science

Foliage leaves are peculiarly liable to injury. From the nature of their work they are denied the protection given to older stems and larger roots. Their delicate structure not only invites insects, larvae, and other plant eating animals, but subjects them to repeated injury by purely mechanical agencies. Observation of leaves as they are found torn and mutilated in nature shows that they possess considerable power of adjustment to wounds and injuries.

Three Glacial Tills At Ames, Iowa, John E. Smith

Proceedings of the Iowa Academy of Science

The observations from which these data were obtained were made in an excavation opened for the basement of Wesley Foundation building just south of the athletic field of Iowa State College on Lincoln Way. The uppermost deposit which is found everywhere on the upland in the vicinity of Ames, is the Wisconsin till, most of which at this place had been removed by erosion prior to the beginning of the work. A zone of red soil about two feet thick just beneath this till serves as an unmistakable indicator of the plane of separation between it and the Kansan till …

Discovery Of Volcanic Ash In Iowa, Charles Keyes

Proceedings of the Iowa Academy of Science

Of all geological phenomena represented in Iowa those illustrating volcanic action are the rarest. Although we already know of the presence of very ancient lava-flows, which are disclosed in deep-well drillings, these are associated with rocks very much older than any outcropping in the state. These are the Keewenawan porphyries of the Northwest. From that very ancient date to the present there is not the slightest sign of volcanic activity discernible in all our very full geologic record. The finding, a short time ago, in the city of Des Moines, of very considerable beds of typical volcanic ash is therefore …

Hall Effect In Thin Silver Films, J. C. Steinberg

Proceedings of the Iowa Academy of Science

The Hall Effect as a function of thickness has been investigated in chemically deposited films of silver, of thickness ranging from 40 to 200 millimicrons, and the Hall Coefficient found to be independent of both magnetic field, for fields up to 20000 Gauss, and thickness. The specific resistance of the same films increases as much as 200 per cent for some of the thinner films. These results are in good agreement with those obtained by Dr. G. R. Wait last year.

The Alpha Lines In The "K" Series Tungsten Spectrum, Charles Crofutt

Proceedings of the Iowa Academy of Science

According to Bohr's theory of the atom, radiation takes place only when an electron goes from one orbit to an orbit closer the nucleus. If W represents the energy associated with an orbit, that is, the energy required to remove an electron from the orbit to infinity, the energy radiated when an electron goes from orbit (1) to orbit (2) will be W₂ - W₁ = h, where orbit (2) is closer the nucleus. Assuming that an absorption frequency corresponds to the energy associated with a ring of the Bohr atom, the difference between two absorption frequencies should …

Table Of Contents

Proceedings of the Iowa Academy of Science

No abstract provided.

A Chemical Study Of Dolomites, Nicholas Knight

Proceedings of the Iowa Academy of Science

Deodat Dolomieu was born in Dolomieu, France, June 23, 1750, and died November 16, 1801. In infancy he was created a Knight of Malta and seemed precocious in many directions. When nineteen years of age he quarreled with a companion and killed him. He was condemned to die for his crime, but after nine months' imprisonment, he was pardoned on account of his youth. He early became interested in geology and mineralogy, and wrote some important treatises on his favorite subjects, especially while residing in Metz; the interesting old capital of Lorraine.

Geological Age Of The Terrepleins Of Utah's Plateaux, Charles Keyes

Proceedings of the Iowa Academy of Science

Usually, genetically associated with the desert ranges the lofty Utah mesas belong not to the Great Basin province, but to an entirely different orographic type, the Colorado Dome. Upon the north flank of the latter they recline as remnantal patches of great sections of soft deposits which elsewhere have been completely stripped off the indurated Paleozoics that constitute the foundation of the broad arch. The High Plateaux appear to be their belated preservation to Tertiary extravasation of lavas that serve as protecting caps for the unconsolidated strata beneath. Were it not for these remnantal tablelands long and exciting chapters in …

The Coefficient Of Simple Rigidity And Young's Modulus For Hexagonal Crystals Of Selenium, L. P. Sieg, R. F. Miller

Proceedings of the Iowa Academy of Science

Elastic constants determined from drawn wires are of considerable practical use, but they are not very illuminating on the subject of the structure of matter. A drawn wire is a heterogeneous mass of matter in crystalline and amorphous states, with never any regularity in composition or of crystalline structure. In fact the elastic constants so determined are not so much characteristic of the substance, say copper, as of the particular physical state of that substance. If, however, one could employ an isolated crystal of a simple elementary substance, he ought to be able to determine the elastic constants of the …

Batholithic Veinings Of The Sierra De Los Cucaras In Baja California, Charles Keyes

Proceedings of the Iowa Academy of Science

The Sierra de los Cucaras is a long, little dissected cuesta the escarpmental axis of which trends northwestward from the head of the Gulf of California. At the crest overlooking the vast, smooth lowland to the eastward its summital plain is about 4000 feet above tide. On the northeast the uplift rises abruptly out of a widespread desert lying below sea-level, the Mexican extension of the Imperial Valley, recently reclaimed extensively to garden purposes through irrigation.

Notes On The Mammals Observed In Marshall County, Iowa, Ira N. Gabrielson

Proceedings of the Iowa Academy of Science

Few specific locality records for mammals in central Iowa have ever been published. The following brief notes, therefore, have been prepared for the purpose of making available for future workers on Iowan mammalogy the information I am able to give. This list is not complete but comprises only such notes and specimens as came to my hands in one way or another during three years' residence.

Notes On The Differential Viability In Gambusia, S. W. Geiser

Proceedings of the Iowa Academy of Science

Barney and Anson (1921) in writing of the fluctuating sex-ratio in the common top-minnow, Gambusia affinis B. & G., have expressed conclusions with respect to a differential death-rate for the sexes quite at variance with data of my own. Briefly stated, they conclude that in the shipping of Gambusia for stocking ponds in mosquito-control work, the female has a higher death-rate than the males and they explain this upon the assumption that the male is more resistant to high temperatures than the female.

The Solar Surface During The Past Thirteen Years - A Review Of Sun-Spot Observations Made At Alta, Iowa From 1908 To 1920, David E. Hadden

Proceedings of the Iowa Academy of Science

My last paper contributed to the Academy of Science on solar observations covered the period 1903 to 1907 and was published in the Proceedings for 1908, Volume XV. The present paper brings the observations down to the close of 1920 and completes a series embracing thirty years of sun-spot observations. They do not pretend to be as complete during the last decade of this long period as for the first twenty years for the reason that I was appointed a member of the State Pharmacy Board in 1909, serving eleven years, and the duties of the office called me away …

The Effect Of Drawing On The Crystal Structure Of Tungsten Wires, L. P. Sieg

Proceedings of the Iowa Academy of Science

The writer has in various places published results of tests on the coefficient of rigidity of drawn tungsten wires. The latest results indicated clearly that in a series of wires drawn down from the same original stock the coefficient of simple rigidity progressively increased as the diameters of the wires decreased. For example, the value of "n" ranged in the case of two extremes of five such wires from 14.15xl0¹¹ to 15.10x10¹¹ dynes per square cm., for corresponding radii of 0.0227 cm., and 0.00240 cm. The hypothesis was put forth at that time that a change in the …

Notes On The Genus Catharinaea In Iowa, Lucy M. Cavanagh

Proceedings of the Iowa Academy of Science

The Genus Catharinaea is represented in Iowa by mosses which have been referred in all published lists to the species C. undulata (L.) W. & M. and C. angustata Brid. Both are species of very wide distribution.

Trees Of The Proposed Mississippi Valley National Park, L. H. Pammel

Proceedings of the Iowa Academy of Science

I am including in this list the trees found within a radius of 30 to 40 miles, which, therefore, includes some trees on the Wisconsin side of Mississippi river, especially a few species found near Muscoda and the mouth of Kickapoo river. I have also listed a few evergreen shrubs.

The Address Of The President - American Science, Nicholas Knight

Proceedings of the Iowa Academy of Science

A year has gone since as an organization we met at Iowa City, and now we find ourselves face to face with the program and responsibilities as well as the festivities of our thirty-fifth annual meeting. As always it has been a year of losses of scientific men from the state, but we have gained others, and as we survey the field, it has proved a year of progress and achievement. The Iowa Academy of Science retains its prestige among sister organizations, and possibly has added to the laurels it already had won.

Some Pleistocene Exposures In Des Moines, James H. Lees

Proceedings of the Iowa Academy of Science

In the early spring of 1921 as the writer was examining the face of the bluff bounding the north side of the Des Moines valley just below the Capitol grounds he noticed, on the west side of the entrance to a ravine between Southeast 13th and 14th streets, where the State operated a small drift coal mine for some time, a section of Pleistocene material above the Coal Measures sandstone, which seemed to present features of some interest. Closer inspection showed the probable presence of two drift sheets and since the superposed evidence of successive invasions of the continental glaciers …

Dr. Rudolph Gmelin And His Collection Of Minnesota, Wisconsin And Iowa Plants, R. I. Cratty

Proceedings of the Iowa Academy of Science

Through the kindness of Mr. Henry C. Gmelin of Elkader, Iowa, a collection of dried plants numbering two hundred and sixty-nine species which were collected by his father, Dr. Rudolph Gmelin, in southeastern Minnesota, western Wisconsin and northeastern Iowa, between the years 1874 and 1894, were presented to the Iowa State College. It fell to the lot of the writer to arrange and mount the collection, and because of the prominence of the collector and the unusual care taken in preparing and preserving the specimens, it has been thought proper to place on record a short biographical sketch of Dr. …

College Catalog And Circular 1921, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

Calendar for 1921-1922 ... 5
Officers of Administration and Instruction ... 6
General Information ... 32
Residence, Student Health, Assembly ... 35
Expenses and Fees ... 36
Free Scholarships ... 38
Extension Service ... 38
College Organizations ... 39
Faculty Organizations ... 39
Training in Actual Teaching ... 40
Public Lectures and Entertainments ... 40
Boarding and Lodging ... 40
Employment of Students ... 42
Twelve Weeks Normal Training ... 42
School Credits in Lieu of Certificate Examinations ... 42
Examinations for Teachers Certificates ... 42
Department Certificates ... 42
Bureau of Recommendations ... 42
Degree Curriculums …

Measurements Of The Amplitude Of Vibration Of The Diaphragm Of The Hewlett Tone Generator, C. E. Lane

Proceedings of the Iowa Academy of Science

The "New Tone Generator" designed by Dr. C. W. Hewlett promises to be a very valuable instrument for use as a precision source of sound. The operation of the instrument has been investigated mathematically by its designer and a method is given for calculating the amplitude of vibration of its diaphragm from the electrical input. The writer herein describes a method whereby it has been possible to make actual measurements of the amplitude by mechanical means for comparison with the calculated amplitudes. The tone generator was used in a vacuum tube oscillatory circuit from which the desired frequencies of alternating …

A Baltimore Oriole Census, Katherine Gilmore, H. E. Jaques

Proceedings of the Iowa Academy of Science

The question with which this article is concerned is one that was under discussion, in the Ornithology Class at Iowa Wesleyan College. The original problem was to discover how many pairs of Baltimore orioles nest yearly in the town of Mount Pleasant where the college is located. As the investigation was carried on and interest deepened, the scope of the problem was enlarged somewhat to include a study of the determining factors in an oriole's selection of a nesting place. When the problem was first undertaken, the town, which has a population of about four thousand and covers an area …

Corn Oil Cake Meal For Growing And Fattening Pigs, John M. Evvard, Russell Dunn

Proceedings of the Iowa Academy of Science

Corn oil cake meal is really a residue of the germs of corn grain which remains after most of the oil is extracted therefrom. The particular corn oil cake meal which we used in our test is a by-product from the manufacture of glucose. These four main products are made from the corn grain: Glucose, corn oil, gluten feed, and corn oil cake meal. It is with the latter that we are to deal.

Bird Banding And Incidental Studies, Dayton Stoner

Proceedings of the Iowa Academy of Science

While the phenomena connected with bird migration have been studied for more than two thousand years much is yet to be learned of this most interesting and still more or less obscure characteristic of our "feathered bipeds." In attempting to throw some light upon their movements new methods have been devised and, in a degree, perfected. Until recently it has been the aim of ornithologists to study the migratory habits of species or even of larger zoological groups; but of late an effort has been made to study individuals of a species by marking the birds in some permanent manner …

Two Additions To Our List Of Cruciferae, R. I. Cratty

Proceedings of the Iowa Academy of Science

Two species of the mustard family not heretofore recorded from Iowa, so far as is known to the writer, have recently come to his notice, namely; Brassica juncea (L) Cosson, or Indian mustard, and Lepidium perfoliatum L. a noteworthy species of pepper-grass.

Shrubs Of The Mcgregor District, L. H. Pammel

Proceedings of the Iowa Academy of Science

The writer has included shrubs found as far north as La Crosse, Wisconsin, where several tamarack swamps occur with their peculiar shrubs; also shrubs of Allamakee and Winneshiek counties where Doctor Shimek has found a number of most interesting shrubs.

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

Proceedings of the Iowa Academy of Science

No abstract provided.

Title Page - Front Matter

Proceedings of the Iowa Academy of Science

No abstract provided.

Proceedings Of The Thirty-Fifth Annual Session (Of The Iowa Academy Of Science), Held At Indianola, April 29 And 30, 1921: Minutes Of The Meeting; Staff & Committee Reports; Revised Constitution Of The Iowa Academy Of Science, 1921

Proceedings of the Iowa Academy of Science

No abstract provided.

In Memoriam: E. W. Stanton, L. H. Pammel

Proceedings of the Iowa Academy of Science

No abstract provided.