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Oldest Flowering Plants Are From Iowa, Charles Keyes

Proceedings of the Iowa Academy of Science

Recent analysis of an abundant coal flora dislodged from "coalballs,'' or "sulphur balls" of the miners, obtained near Des Moines, reveals a number of fine flowers showing all the essential structures of present-day forms. These occur near the base of the local coal measures. Stratigraphically the horizon is very low in the Mid Carbonic general column. Above this level are now known no less than four miles of Des Moines coal shales, all of the Pennsylvanian coal series, of perhaps equal thickness, and all of the Missourian coal measures of corresponding thickness. This places the plant horizon only a few …

Angular Distribution Of The Protons From The Deuteron - Deuteron Reaction, A. Ellett, R. D. Huntoon, D. S. Bayley, J. A. Van Allen

Proceedings of the Iowa Academy of Science

A collimated beam of deuterons, of accurately controlled energy, has been directed into a chamber filled with deuterium gas at a pressure of 0.5 mm. of Mercury. High Energy protons are produced in the well-known nuclear reaction: H²+H²→H¹+H³. The number of such protons ejected per unit solid angle from disintegrations occurring in a selected volume has been measured as a function of angle with the incident beam. For a bombarding energy of 325 kilovolts we find the angular distribution to be represented by 1 + 1.35 cos² ϑ, where ϑ is …

The Significance Of The Liquid Structure Of Water, G. W. Stewart

Proceedings of the Iowa Academy of Science

A discussion of what is at present known of the liquid structure of water and the dependence of behavior upon that structure.

Elasticity Of Lead Crystals, A. F. Deming

Proceedings of the Iowa Academy of Science

Additional measurements have been made on the Young's Modulus of lead single crystals. The value of the modulus depends on the orientation of the length of the specimen relative to the crystallographic axis. This relationship will be shown.

A Study Of The Development Of Skill In Learning To Operate The Hollerith Card-Punching Machine, W. Leroy Cation

Proceedings of the Iowa Academy of Science

In this study the writer served as both subject and experimenter. Previous to this experiment the writer had had 110 experience in punching Hollerith cards. The data used for punching were coded prior to the actual punching- of the cards. The 80-column card was used. There were sixteen 30-minute periods throughout a period of five weeks. With two unavoidable exceptions the practice periods were held each Monday, Wednesday, and Friday at 4:00 P.M.

A Reversible Card-Sorting Board, Martin F. Fritz

Proceedings of the Iowa Academy of Science

In the study of antagonistic visual habits (Fritz, J. Comparative Psycho!., 1930, 11, 171-184), it is necessary to devise a method whereby certain selected habits directly oppose each other. Each learned act must have a counterpart in an antagonistic act so as to produce .interference. Such a system of mutually exclusive habits can be arranged by means of the card sorting technique. Fifty playing cards are glued to a board in a pattern so that when the board is turned around (180 degrees), the numbers (pips) will be the same but the suits reversed, that is, black and red suits …

Some Factors Affecting The Achievemnet In Physics Subjects Of Students In A Survey Course In The Physical Sciences, W. H. Kadesch

Proceedings of the Iowa Academy of Science

In the fall and winter quarters of the school year 1937-38 the gains made by about 200 students were examined to find what correlation existed between success in the physics portions of the course and the two following factors: 1) Intelligence rating, and 2) Previous study of physics. The gains were greatest for the group of highest intelligence and least for that of lowest intelligence. The average gains made by these two groups differed by about 40 per cent. Those who had credit for a year of high school physics made a somewhat greater gain than those who had not …

The Influence Of Colchicine On The Germ Cells Of Insects, Melanoplus Differentialis And Gryllus Assimilis, With Special Reference To The Cytoplasmic Inclusions, Thomas P. Dooley

Proceedings of the Iowa Academy of Science

Colchicine injected into the body cavity of insects affects the mitotic process of the germ cells by destroying the spindle. The chromosomes become clumped or scattered depending upon the concentration of the colchicine used. The injections were of .OS5cc. of concentrations ranging from .5 per cent — .O5 per cent solutions. A testis from an animal injected with colchicine often shows numerous giant spermatids. Accompanying this karyokinetic disturbance the mitochondria, which are generally in the form of threads along the spindle fibers during the metaphase and anaphase, fail to assume such arrangement. They are found diffused in the cytoplasm in …

Index

Proceedings of the Iowa Academy of Science

No abstract provided.

The Alumnus, V23n1, January 1939, Iowa State Teachers College

The Alumnus

Inside This Issue:
-- The Campus Parade
-- Forecasting Success in College
-- The Life One Teacher Lives
-- A Pension Plan for Iowa Teachers
-- Youth Goes to College
-- College Invites 15,500 Alumni to Spring Reunion, May 28
-- Record of Placements Reaches Ten-Year High
-- The Prowl....
-- Alumni News
-- Marriages
-- Births
-- Deaths
-- Faculty on the March
-- Alumni Calendar of Events

1939 Old Gold, Iowa State Teachers College

UNI Yearbooks

The student yearbook of the Iowa State Teachers College, later known as the University of Northern Iowa.

Winter Sports Dope Book 1938-1939, Iowa State Teachers College

Athletics Media Guides

Contents:

--Basketball Roster for 1938- 1939 Season --1
--Returning Lettermen --1
--Returning Reserves --2
--Two Sophomore Prospects --2
--Transfers --3
--Lettermen Lost From 1937-1938 Squad --3
--Oliver Martin Nordly --4
--Basketball Schedule for 1938-1939 Season --4
--Results of 1937-1938 Basketball Season --4
--North Central Conference Standings for 1937-1938 --5
--Leading North Central Scorers for 1937- 1938 --5
--How Panthers Scored in 1937-1938 --5
--Schedules of 1938-1939 Basketball Opponents --5
--Wrestling Roster for 1939 Season --11
--David H. McCuskcy --11
--Returning Lettermen --12
--Wrestling Schedule for 1939 Season --12
--Results of the 1938 Wrestling Season --12

Title Page - Front Matter

Proceedings of the Iowa Academy of Science

No abstract provided.

A Quantitative Study Of The Early Weed Stage Of Secondary Plant Succession In Central Iowa, J. M. Aikman, Helen F. Barr

Proceedings of the Iowa Academy of Science

Count-list and chart quadrats, camera-sets-frequence and frequence-abundance determinations were used to compare the vegetation of 28 fields in Story and Boone counties during the first growing season following cultivation. Similarities and differences in growth response as well as in floristics were tabulated and evaluated. There seemed to be little relationship between the frequency and constancy of the species and previous cultural treatment although there was a definite relationship between their abundance and previous cultural treatment. By the end of August, in the drought year of 1934, sufficient top cover had developed to reduce to an appreciable degree the force of …

The Use Of The Spectroscope In Chemistry, F. H. Spedding

Proceedings of the Iowa Academy of Science

A discussion was given of the types of spectroscopes with particular attention to the limitations and applications of certain instruments for absorption and emission spectra studies. The difficulties of manipulation in various regions of the spectra were itemized with a discussion of present technics for such regions.

Significance Of Carboniferous And Late Devonian Material Within The Iowa Devonian, S. W. Stookey

Proceedings of the Iowa Academy of Science

It is a well-known characteristic of the Devonian limestones that to an extraordinary degree they have been affected by the destructive work of percolating water through solution. This is, no doubt, in part accounted for by the comparative purity of these limestones. The chemical process of dolomitization which is characteristic of the Silurian beds is here at a minimum, and rapid solution by meteoric waters has been the result. It is apparent also that the diastrophic movements that have affected the Devonian terranes have facilitated this destructive process. Wherever there are exposures of these beds, either natural or artificial, the …

Origin Of Pre-Cambrian Pseudo-Conglom-Erates From The Black Hills, J. J. Runner

Proceedings of the Iowa Academy of Science

Masses of rock strongly resembling pebbles and boulders of granite occur in the pre-Cambrian sediments of the Black Hills about four miles west of Custer, South Dakota. These pseudo pebbles and boulders range in size from 1/8 inch up to nearly one foot in diameter, have smooth surfaces, and are well rounded. Evidence is presented that they were formed from continuous thin layers of calcareous sediment within siltstone beds. These were pinched out into small lenses during folding and rounded by rolling along shear planes. Later they were partially replaced by feldspars, quartz and micas by contact action of an …

Roots Of Quadratic Equations Expressed In Continued Fractions, Fred Robertson

Proceedings of the Iowa Academy of Science

The solution of the quadratic equation x²-2bx+c=0 (1) with c negative is x=b¹+c/x (2) where b¹=2b.

Apparatus For Producing Soft X-Rays, F. M. Bailey

Proceedings of the Iowa Academy of Science

A 30-watt soft x-ray apparatus has been designed to provide a simple and economical source of soft x-rays for radiography in the wavelength region between 1.1 and 0.6 Angstroms. The x-ray tube was constructed of pyrex, and a thin spherical window incorporated for transmitting the radiation. The electrical equipment was built from standard laboratory parts, employing a neon sign transformer as a source of potential.

Relative Intensities Of Fluorescence At Low Temperatures, J. E. Dinger

Proceedings of the Iowa Academy of Science

The change in intensity of fluorescence of ZnSiO₃, CaWO₄, CdB₂O₅, was measured at various temperatures between room temperature and the temperature of liquid oxygen. The fluorescence was excited by means of the 2537 Å line of a mercury arc. Microphotometric measurements were made on photographs of the fluorescent spectra. The results indicate a decrease in intensity with decrease in temperature of the CdB₂O₅ and the fluorescence of ZnSiO₃ passes through a maximum of intensity between room temperature and liquid oxygen temperature.

A Comparison Of Four Methods Of Increasing The Reading Speed Of College Students, Lyle K. Henry, A. R. Lauer

Proceedings of the Iowa Academy of Science

Research in the field of education has brought out many weaknesses of the older systems and methods of presenting subject matter. Perhaps some of the most revealing studies have been in the field of reading. The early work of Dodge (1) has been adequately supplemented by the researches of Gates (2) Judd (4) Gray and others. Not only have vast individual differences in reading rate been noted, but marked improvement has also been effected by systematic practice exercises. Much of the earlier work was done with grade pupils in the regular courses of study in reading. More recently Pressey (6) …

The Oxidizable Organic Matter And Organic Nitrogen Content Of The Okoboji Lakes, A. Gray Adamson, Theodore L. Jahn

Proceedings of the Iowa Academy of Science

The amount of dissolved organic material which is present in a lake may be used as an index of the amount of food available for growth of micro-organisms, and is therefore of importance in studying the biological productivity of any given body of water. The purpose of this investigation was to determine the amount and distribution of organic matter in the Okoboji Lakes. This was studied as a function of depth below the surface and also as a function of the particle size of the organic material, that is, whether the material could be considered as net plankton, nannoplankton, or …

A List Of The Mordellidea (Coleoptera) Known To Occur In Iowa, H. E. Jaques, Donald Gordner

Proceedings of the Iowa Academy of Science

The tumbling flower beetles, as these small active insects are called, are capable of running and flying about with great rapidity. Their habit of kicking and tumbling about after having fallen out of a flower is responsible for their common name. They are small, wedge-shaped beetles; their body arched; head bent downward and the abdomen usually prolonged into a pointed style. In most species the hind legs are very long, front legs short, the hind tarsi long and compressed. The tarsal claws are either simple or cleft to the base. They are usually black, densely covered with fine silken pubescence, …

Electrical Activity Of The Invertebrate Eye In Response To Illumination, Frederick Crescitelli, Theodore L. Jahn

Proceedings of the Iowa Academy of Science

Definite electrical changes can be detected in the eyes of many animals in response to illumination of the eyes. In the vertebrate eye these changes take the form of characteristic electrical variations known successively as the a-, b-, c-, and d-waves. Similar waves can be elicited from the compound eyes of a number of invertebrates. The simplest method of studying these electrical changes in invertebrates is to lead off by silver-silver chloride electrodes from fluid-filled chambers built around each eye. One eye is illuminated while the second eye is kept in darkness. The electrical potentials are amplified by means of …

New Species Of Carboniferous Spores From The Des Moines Coals Of Iowa, L. R. Wilson, E. A. Coe

Proceedings of the Iowa Academy of Science

A stratigraphic study of the plant microfossils m the Iowa Pennsylvanian coals by the maceration method has been in progress during the past three years. A statistical correlation was made between two coal sections near what Cheer, Iowa, by the selection and use of six distinctive microfossils. Further examination of 42 samples of coal from eight Iowa counties yielded many spore types of which eight are now described as new genera and species. No serious attempt has been made to use the described spores as horizon markers.

Extension Of Maryville Lowland Into Iowa, Charles Keyes

Proceedings of the Iowa Academy of Science

In the recent description of the major physiographic provinces of Iowa (Pan-American Geologist, volume LXX, p. 39, 1936) the Loessial Hills belt and the Dividal Upland division were represented as reaching quite to the Missouri boundary, in the southwestern quarter of our state. Notwithstanding the circumstance that this is quite so, there is yet obvious diminishing force of the two provinces mentioned towards the extreme south. The area south of the Reel Oak fault is very noticeably flattened and hollowed, and is occupied in the down-throw depression by little resistant shales. This shallow basin is rimmed all about by limestone …

Measurement Of Young's Modulus With Small Stress, E. P. T. Tyndall

Proceedings of the Iowa Academy of Science

A modification of the apparatus previously described by Van Allen has been designed and used for measurements on zinc and lead crystals.

Additional Iowa Species Of Dolichopodae (Diptera) With Some Ecological Notes, B. G. Berger, H. E. Jaques

Proceedings of the Iowa Academy of Science

A family that is easily distinguished from all other families, small to medium sized, and sufficiently abundant to make collecting enjoyable and profitable, has the desirable characteristics for the beginning Entomologist. Such is the Dipterous family Dolichopodac. The discal and the second basal cell of the wing are coalescent. Wing venation is simple but the last section of the fourth longitudinal vein has very striking and definite characteristics.

The 1938 Longspur Tragedy In Northwest Iowa, T. C. Stephens

Proceedings of the Iowa Academy of Science

On Thursday, January 6, of this year (1938), I received by mail from Mr. Weir R. Mills, of Pierson, Iowa, the bodies of twelve birds. They were all Lapland Longspurs (Calcarius lapponicus). Later a letter reported that these bodies had been picked up from the streets in the business district of Pierson on Thursday morning. This was the first intimation I had of a rather wide-spread destruction of these birds in northwestern Iowa on the night of January 5-6. It may be well to state at this time that there was a light snow fall on this night, but it …

In Memoriam: John Budd Wentz; Arthur Alfred Bryan, H. D. Hughs, A. A. Bryan, Frederick D. Richey

Proceedings of the Iowa Academy of Science

No abstract provided.