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Stuttering In Relation To Various Speech Sounds, Wendell Johnson, Spencer F. Brown

Proceedings of the Iowa Academy of Science

Thirty-two stutterers read over 300,000 words, stuttering in relation to over 30,000 of them. Stuttering was analyzed with reference to its relative frequency in relation to specific sounds, and conclusions were drawn with reference to the problem of the precipitation of a moment of stuttering.

Pitch And Intensity Characteristics Of American Dramatic Speech, J. M. Cowan

Proceedings of the Iowa Academy of Science

Physical analyses of these factors are presented in the form of a graphical speech score. A simultaneous presentation of recorded speech and scores will be made.

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

Proceedings of the Iowa Academy of Science

No abstract provided.

Comparative Progressive Metamorphism Of Igneous And Sedimentary Rocks, R. C. Spivey

Proceedings of the Iowa Academy of Science

Metamorphic rocks are frequently arranged in zones around igneous intrusions, and each of these zones has certain characteristic minerals by which it can be recognized. Zones of low-grade metamorphism, garnet, kyanite and sillimanite are frequently discernible, and these zones are remarkably similar in different regions, even though the original rocks may have been quite diverse. This similarity in the rocks formed by the metamorphism of igneous and sedimentary rocks suggests that many rocks assumed to be meta-igneous may really be meta-sedimentary in origin.

The High-Vacuum Tetrode As A Thyratron, R. D. Huntoon

Proceedings of the Iowa Academy of Science

A circuit is described wherein the ordinary tetrode or screen-grid vacuum tube, when operated as a Dynatron exhibits the characteristics of a Thyratron or gas-filler triode. The method of determining the circuit constants and details of operation are given. Several simple applications such as quiet automatic volume control for radio receivers, "scale" counters, and sweep circuits are outlined.

Let's Psychologize On The Curriculum, Lyle K. Henry

Proceedings of the Iowa Academy of Science

It is generally believed that psychology has made a significant contribution to teaching methods. Can not the psychologist he of service in determining what is to be taught as well as in determining how teaching methods can be improved?

Preliminary Study Of Certain Changes Occurring Under Sodium Amytal, James W. Layman

Proceedings of the Iowa Academy of Science

The present report deals with a quantitative study of certain intellectual and motor changes which occur in schizophrenic patients under the influence of sodium amytal, a hypnotic drug used for therapeutic purposes with patients receiving psychiatric treatment at the Psychopathic Hospital of the State University of Iowa.

A Method For Determining The Exchange Capacity Of Organic Matter In The Presence Of Nitrogen And Calcium, H. C. Millar, F. B. Smith, P. E. Brown

Proceedings of the Iowa Academy of Science

Many methods have been used for determining the base exchange capacity of soils and certain advantages have been claimed by each investigator for his particular method. Fewer studies on the base exchange reactions of organic matter have been made and the nature of the material makes many of the methods used for soils impracticable and inaccurate when applied to organic matter. According to McGeorge (1) the monovalent lignin salts are soluble in alcohol and the use of alcohol in base exchange studies on organic matter is of questionable value. The removal of excess soluble salt from the base exchange …

The Orientation Of Liquid Crystals Of Paraazoxyanisol Occurring With Temperature Gradient And No Correction, G. W. Stewart, D. O. Holland

Proceedings of the Iowa Academy of Science

The former author has shown by experimentation in paraazoxyanisol that there is a phenomenon of orientation of liquid crystals perpendicular to the direction of the temperature gradient if no convection is present. The interpretation made is that the orientation is caused by the scattering of elastic waves which predominate in the direction of the temperature gradient. Obviously such an experiment requires more complete verification. This the second author has done by photographing the entire diffraction ring produced by the liquid crystal group and by showing that the distribution of the density of the film is in accord with preceding experiments …

Intensive And Durative Aspects Of The Interpretation Of A Musical Score, Arnold Small

Proceedings of the Iowa Academy of Science

The purpose of this study was to determine how closely the violinist follows the printed score in assigning temporal and intensity values to notes and to demonstrate some ways in which duration and intensity are utilized in stress and phrasing.

An Analysis Of The Berger Rhythm, With Special Reference To The Duration And Amplitude Of The Individual Wave, John R. Knott

Proceedings of the Iowa Academy of Science

The rhythmical electrical potential waves recorded from the human brain have been classified by their discoverer, Berger² into two types: alpha-waves, and beta-waves. This classification is made on the basis of the duration and amplitude of the waves. Waves having a duration of about .10 sec. and an amplitude of about 20 microvolts fall into the category of alpha-waves. Waves having a duration of about .04 sec. and an amplitude of about 10 microvolts make up the beta-waves. In general, the beta-wave is formed on the sides of the larger and more predominant alpha-wave.

Inheritance Of Resistance And Susceptibility To Salmonella Aertrycke In Mice, H. O. Hetzer

Proceedings of the Iowa Academy of Science

In previous reports by the writer and others it has been shown that the resistance of a strain of mice to controlled infections of Salmonella acrtrycke could be greatly increased by selective breeding. After fourteen generations of selection for resistance to a standard close of 2 x 10⁵ organisms the mortality in the selected stock (S) was only 8 per cent as compared with a mortality of approximately 98 per cent in the highly susceptible Silver (Sil) and Bagg albino (Ba) strains.

Factors Controlling The Diurnal Spermatogenic Cycle Of The Male Sparrow (Passer Domesticus), Gardner M. Riley

Proceedings of the Iowa Academy of Science

In the normal development of the sparrow testis, a daily period of active spermatogenesis is found between the hours of 2:00 A.M. and 4:00 A.M. This restriction to the hours of darkness appears all the more significant since an inversion of the light period results in the occurrence of mitotic figures during the afternoon hours.

Rare And Unusual Plants From South Eastern Iowa, Charles Gilly, Malcolm Mcdonald

Proceedings of the Iowa Academy of Science

In 1922 Professor Charles Carter, of Parsons College, and the late Dr. L. H. Pammel, of Ames, began a botanical survey of south-eastern Iowa. During the years following, collections were made and the specimens sent to the herbarium of Iowa State College, where the headquarters of the survey had been established. After Dr. Parnmel's death in 1931 the project was abandoned; but in April, 1933 Professor Carter revived it and the authors began the collection of specimens for a Parsons College Herbarium. In the past three years they have collected and identified about 800 species of plants. The greatest portion …

Phosphotungstic Acid As A Test For Potassium In Qualitative Analysis, S. Porter Miller

Proceedings of the Iowa Academy of Science

When a potassium salt is added to a solution of phosphotungstic acid a characteristic dense, white, difficultly filterable precipitate is formed. The test is as sensitive as any of the tests commonly used; one cc. of a ten percent solution will give an easily distinguishable precipitate with 1 cc. of 0.02 M potassium chloride. Ammonium, which also forms a very insoluble compound, interferes, and must first be removed.

Iodine Substitution Products Of Vanillin, L. Chas. Raiford, Eugene H. Wells

Proceedings of the Iowa Academy of Science

In 1872 Carles prepared a mono- and a diiodovanillin, but did not characterize them. In the current edition of Beilstein they are recorded as of unknown structures. Carles' work has now been repeated, and the structures of his products have been shown to be 5-iodovanillin and 2, 5-diiodovanillin, respectively. The behavior of these and similar derivatives toward typical amino compounds has been studied. No pronounced steric hindrance was noted in the latter reactions. The relation between the numerical values of the melting points and the positions of the halogen atoms in the iodine derivatives, so far as they have been …

The Occurrence Of Gypsum In Mississippian Formations Of Iowa, A. C. Tester

Proceedings of the Iowa Academy of Science

During the last three years several new deep wells have been drilled in Iowa and accurate sets of well cuttings have been studied. This material indicates the presence of bedded gypsum both in the forms of selenite and anhydrite in formations below the Ste. Genevieve and above the Kinderhook. It is suggested that the horizon is a part of the Warsaw formation and represents an interior saline basin of central Iowa. The details of the well logs of the intervals involved are included in the discussion.

New Quarries In Madison County, Mrs. Arthur Goshorn

Proceedings of the Iowa Academy of Science

Opening new quarries at convenient points, Madison County has covered nearly 100 miles of county roads with crushed rock. The towns of St. Charles, Patterson and Winterset have their own crushers and are covering their streets and alleys with rock from quarries nearby. Winterset's quarry is inside the city limits.

A Criterion For Prime Numbers, Carl W. Strom

Proceedings of the Iowa Academy of Science

Let ƒn denote the sum of the divisors of the positive integer n and ƒ (n - a), a < n. similarly denote the sum of the divisors of the positive integer (n - a).

Some Observations Concerning The Evaporation Metals From Hot Filaments, M. Alden Countryman

Proceedings of the Iowa Academy of Science

For effective evaporation of metals from hot filaments, the metal to be evaporated, if different from the filament substance, must wet and cling to the hot filament used. A number of filament materials have been tried and the metals which wet each are reported.

Tensors And The Calculation Of Vibrational Frequencies Of Crystal Plates, R. G. Wilson, J. V. Atanasoff

Proceedings of the Iowa Academy of Science

A tensor method has been developed for the calculation of the frequencies of vibration of an infinite plate of any crystalline substance cut at any orientation. By the use of this theory a set of curves have been calculated showing the three characteristic frequencies for plates of quartz cut at various orientations. These results are in good agreement with the experimental work of the authors and other observers.

Resistivities Of Alloy Single Crystals, H. E. Way

Proceedings of the Iowa Academy of Science

A somewhat systematic attempt is being made to study the effect on electrical resistivity of zinc of small amounts of dissolved metallic impurities. In order to do this sets of single crystals have been made, each set containing a known percentage of some one impurity. The resistivities and some temperature coefficients of resistivity have been measured. The resistivity results include at the present data on sets of crystals containing 0.125, 0.25, 0.50 per cent of copper, gold, or silver, and 0.005% and.01 per cent iron. In all cases the resistivity increases with increase of added metal but not in a …

A Measure Of The Amount Of Chance In True-False Tests, E. O. Finkenbinder

Proceedings of the Iowa Academy of Science

When students were informed of the number of errors they had made on a 30-point true-false test and given their answer sheets on which they crossed out and changed the answers they thought might be the ones in error, they could not significantly raise their scores (corrected for chance) when the number of true and false statements were approximately equal. If the number of true statements were greatly in excess of the false statements, say two true to one false, they lowered the score by their changes. On the other hand, if the false statements greatly outnumbered the true ones, …

Notes On The Propagation Of The Large-Mouthed Bass Aplites Salmoides (Rafinesque) In Iowa, W. W. Aitken

Proceedings of the Iowa Academy of Science

The new artificial lakes of Iowa are particularly adapted for the large-mouthed bass (Aplites salmoides-Rafinesque), because the lakes are fed intermittently with run-off producing turbid conditions periodically, because large areas in the upper reaches of the lakes have suitable spawning areas, because crappie and bluegill do well in the same type environment, in turn becoming bass prey, because the warm waters of these areas have a proper amount of nitrogenous material necessary to stimulate growth of zoo-planton forms listed on the young bass bill-of-fare, and because the manmade lakes have sufficient depth to carry fish through severe winter months. There …

The Morphology Of A Teratological Calf, Richard Watson

Proceedings of the Iowa Academy of Science

The calf under study was a two-headed monster. It was born of a Reel Polled mother, at term, alive in utero, but died shortly after birth. Data concerning its sex and parentage are lacking. The body of the calf was normal, but the head parts were divided double from the region of the atlas. The heads were joined almost back to back, their mesial lines forming a broad "Y" with the vertebral column. Externally, despite the malformation, the symmetry of the two heads was striking.

44. Slave Narratives (1864 - 2 Documents), Amelia Jones, Byers York, Wallace Hettle (Editor)

Union Homefront: A History in Documents

Document citations

Document 1:

“Amelia Jones” in Federal Writers’ Project. Slave Narratives: A Folk History of Slavery in the United States From Interviews with Former Slaves, Vol. 7. Washington: Library of Congress, 1941, pg. 11-12.

Retrieved From: https://www.loc.gov/item/mesn070/

Document 2:

“Susan Dale Sanders” in Federal Writers’ Project. Slave Narratives: A Folk History of Slavery in the United States From Interviews with Former Slaves, Vol. 7. Washington: Library of Congress, 1941, pg. 17-18.

Retrieved From: https://www.loc.gov/item/mesn070/

The Vascular Flora Of The Area To Be Submerged By Lake Macbride, Edgar F. Pierson

Proceedings of the Iowa Academy of Science

Lake Macbride, an artificial lake located in Johnson county, Iowa, a few miles north of Iowa City, was established by building a dam below the junction of two small creeks. The resulting basin is somewhat V-shaped with approximately 8 miles of shoreline. The lake bed is for the most part loess excepting a few small sandy areas and the alluvial deposits next to the old creek channels. The shoreline toward the dam is rather abrupt, the south shore being of the exposed limestone type. With few exceptions the rest of the shoreline is either loess or loess-capped. The border lands …

A Fusarium Following Frost-Injury Of Robinia, J. C. Gilman, B. B. Sproat

Proceedings of the Iowa Academy of Science

In the fall of 1935 a number of specimens of seedlings of Robinia pseudo-acacia L. were submitted to the Department of Botany of Iowa State College for the investigation of a canker which was girdling the sterns of these plants at or about the ground line. On a majority of the specimens examined, the injury consisted of a sunken area approximately two centimeters in length completely surrounding the stem. The wood under these cankers was materially browned and the cambium was dead. Many of these cankers were covered with orange sporodochia of a fungus which microscopic examination proved to be …

Table Of Contents

Proceedings of the Iowa Academy of Science

No abstract provided.

The Address Of The President: Paul Bunyan Turns Scientist, R. E. Buchanan

Proceedings of the Iowa Academy of Science

Paul Bunyan Turns Scientist-Paul Bunyan, the legendary hero of the north woods has in recent years developed far toward becoming the Baron Munchausen of America. In fact, his feats of strength and cleverness quite surpass those of the Baron himself.