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Translocation Of Iowa's Siouan Mountains, Charles Keyes

Proceedings of the Iowa Academy of Science

67. Translocation of Iowa’s

The lofty Siouan Mountain range, which in Triassic times was upraised across northwestern part of our State, and which was comparable in every way to the present Appalachians of eastern United States, the Juras of France, or the Colorado Rockies of today, were quickly and completely razed to the level of the sea in Jurassic and Early Cretacic days. The disposal of this huge mass attracted little interest. It was naturally assumed that it was swept into the Mexican Gulf. It now transpires that this was only partially true; only the debris from the near side …

New Method Of Precise Geological Correlation, Charles Keyes

Proceedings of the Iowa Academy of Science

Attention is directed to the value of volcanic ash-beds intercalated in other strata as indices to precise correlation of geological terranes. Such ash-beds, when once recognized, are often found to be wide-spread ; and being formed under conditions independent of water-laid basinal deposits pass uninterruptedly from one province to another. At present the most important clue to an horizon of this kind to be looked for in Iowa is an Ordovicic one near the base of the Decorah shales.

Two Theorems On Annuities, John F. Reilly

Proceedings of the Iowa Academy of Science

In each of the special cases h + k = n - 1, and n annual payments are made. The values of h and k are so chosen that the present comes at the desired point - for the amount of an annuity at the time of the last payment; for the present value of an annuity one year before the first payment; for the amount of an annuity-due one year after the last payment; for the present value of an annuity-due at the time of the first payment; and for the present value of a deferred annuity r + …

Experiments With Small Numbers Of Observations, George W. Snedecor

Proceedings of the Iowa Academy of Science

This is a report on part of an experiment that is under way having for its objective the determination of (a) the extent of divergence from theoretical values of probability in small samples, and (b) the extent of divergence from theoretical values of probability as computated by "Student's" method if the sample is drawn from a non-normal distribution.

A Table Of Wave Lengths And Frequencies Of Electromagnetic Radiations Of Zero To Infinity, A. C. Bailey

Proceedings of the Iowa Academy of Science

The table includes about seventy known octaves ranging from 20 X units to 20,000 meters. The octaves are plotted on a logarithmic scale 1 X arbitrarily chosen as the end of the first octave. The wave-lengths and frequencies of such radiations as are characteristic of known phenomena as well as those which limit certain known regions, arc charted with notations of interest made opposite.

Studies On The Effect Of Ultra-Violet Rays Upon Yeast Metabolism - I. The Effect Of Ultra Violet Light Upon The Medium, A. C. Bailey, J. W. Woodrow, Ellis I. Fulmer

Proceedings of the Iowa Academy of Science

74. Studies on the effect

Exposure of the medium (composed of optimum concentrations of salts and sugar) to ultra-violet light renders it less effective for the growth of yeast. The development of the toxicity increases with duration and intensity of irradiation. An exposure of seven hours through quartz at about l5 cm from a quartz mercury vapor lamp affects the medium in such a way that yeast will show practically no growth in the medium. The work is being continued in order to obtain quantitative results and to explain the phenomenon.

The Diffraction Of X-Rays By Liquids, E. Horbart Collins

Proceedings of the Iowa Academy of Science

An experimental test of the theory of Ramam and Ramanathan on the diffraction of x-rays by liquids.

The Growth Of Chickens As Effected By The Sunlight Transmitted Through Glass Substitutes, L. V. Crum, J. W. Woodrow

Proceedings of the Iowa Academy of Science

Three weeks' old chicks which had been deprived of direct sunlight and fed on a rachitic diet, were placed behind common glass and glass substitutes for four weeks. Those behind glass made an average gain of 180 per cent, while the groups behind the substitutes made gains of 300 per cent and 250 per cent. All outward appearances of rickets had disappeared among those behind the glass substitutes, while the disease was in evidence in the case of those behind glass.

An Attempt To Detect A Predicted Pressure Effect In Gases, G. E. Davis

Proceedings of the Iowa Academy of Science

Fairbourne (Phil. Mag., June, 1922) describes an apparatus which he considers capable of demonstrating the limit of applicability of the second law of thermodynamics, by causing gas molecules to build up a difference of pressure, and consequently to do mechanical work at the expense of their kinetic energy. Articles published later by Witmer and by Fisher (Phil. Mag., 1924) seem to prove that Fairbourne's conclusions are incorrect, at least in part. However they did not consider the effect of adsorption. Experiments were undertaken to test Fairbourne's conclusions experimentally. Thus far the pressure effect which he predicts has not been detected.

Criticism Of A Theory Of Electrical Resistance, John A. Eldridge

Proceedings of the Iowa Academy of Science

The theories which have been devised to account for electrical resistance have had a very meager success. The most serious fault with all such theories is the fact that they give an incorrect temperature coefficient of resistance. As is well known, the resistance of most metals is nearly proportional to the absolute temperature, while most of the theories give a value proportional to the square root of the temperature. The well-known theory of Bridgman proposed several years ago portended to give the proper relationship, but this appears to be due to a mistake in the analysis.

A Study Of An Objective Achievement Examination In Physics, C. J. Lapp

Proceedings of the Iowa Academy of Science

80. A study of an objective achievement

A carefully prepared objective achievement examination in physics was given to a class of freshmen for their final examination at the end of the first semester. To compare with these results, there was available twenty-seven ten-minute, and fifty-minute examinations. The correlation between these two sets of data for about 230 students was extremely high.

Optical Constants Of Molybdenite In The Ultra-Violet, A. W. Meyer

Proceedings of the Iowa Academy of Science

The index of refraction and extinction index of molybdenite (MoS) for a natural cleavage surface have been determined in the ultra-violet by the crystelliptometer. The computed reflectivity is compared with the values directly determined by Coblentz.

Hall Effect And Specific Resistance In Thin Evaporated Film Of Fe, Co, Ni, Pd, And Pt, H. B. Peacock

Proceedings of the Iowa Academy of Science

Further investigation of the Hall effect and specific resistance in thin films of iron, cobalt, nickel , palladium, and platinum give the following results: (1) the specific resistances of films deposited on a cool surface range from 4 to 30 times the accepted values for the corresponding bulk metals; (2) the Hall coefficients for the paramagnetic metals palladium and platinum are slightly smaller than bulk values: (3) the Hall coefficients for iron, cobalt, and nickel deposited on a cool surface are respectively 1.8 times, 5 times, and 7 times, the bulk values; (4) heating films of iron, cobalt, and nickel …

The Action Of Cylindrical Tubes In Branch Acoustic Lines, G. W. Stewart

Proceedings of the Iowa Academy of Science

Quincke's tube has long been known. A theoretical and experimental study of its action is herewith reported. Also the formulas for an open tube as well as a closed tube have been derived. The experimental results show unmistakable evidence of the viscosity. The selective property of Quincke's tube is ascertained both experimentally and theoretically for the first time.

The Position Of The Vibrating Source In The Kundt's Tube Experiment, G. W. Stewart

Proceedings of the Iowa Academy of Science

Various textbooks are not in agreement as to whether the vibrating piston is at a node or "near a node." The theory shows that it is strictly at a node. The misstatement in regard to the location of the piston has probably been caused by a misunderstanding of the word "node.” The piston is one-half wave-length from the nearest node and yet it is strictly not a point of rest.

Involuntary Tongue Movements Under Varying Stimuli, M. George Scheck

Proceedings of the Iowa Academy of Science

The investigation of involuntary speech movements is a study which has many points of contact. At one extreme there is the attempt to disprove the theory of "imageless-thot" by demonstrating that movements of subvocal articulation are, under normal conditions, always present, and that one may therefore assume the presence of kinesthetic sensations, resulting from such movements. If the movements themselves are so much a part of the thot processes, it is probable that images of a knesthetic-verbal type should accompany them likewise. So, if no concrete visual, auditory, or motor imagery need be present in thinking, at least imagery of …

An Objective Study Of The Vocal Art, Milton Metfessel

Proceedings of the Iowa Academy of Science

By means of specially adapted sound photographic instruments, the voices of twelve vocal artists have been photographed. Interpretations of "Annie Laurie" by the following artists were used: MacCormack, Bispham, Welles, Lashanska, Case, Miller, Homer, Nordica, Nielson, Melba. Farrar, and Baker. A new musical staff has been introduced to adequately represent the facts analyzed from the data on the motion picture film. Among the factors of the vocal art isolated so far are: Attack of a tone, Vibrato, Release, Rhythm, Tempo. Sharping and Flatting, Crescendo, Diminuendo, Swell, Glide, Portamento, Effect of Phonetic Elements, Appogiaturas, Effect of Muscular Strain on the Vibrato, …

The Measurement Of Natural Capacity For Skill In Stenography, Oliver A. Ohmann

Proceedings of the Iowa Academy of Science

An experimental study attempting to discover a team of tests for measuring the natural capacity of an individual for attaining skill in stenography. Such a group of tests might be used in the eighth or ninth grades for predicting the success in stenography of those who expect to pursue the commercial course in high school. An analysis was made of the psychological abilities required in stenography. Eleven group tests were selected or devised to measure these several capacities. These eleven tests, together with a performance test in stenography, were then administered to 225 advanced students in high school courses in …

Conditioning The Sexual Instinct In The Albino Rat, H. R. Fossler

Proceedings of the Iowa Academy of Science

No abstract provided.

Sound Localization: A Comparison Of Methods, C. A. Ruckmick

Proceedings of the Iowa Academy of Science

While there has been much experimental investigation f the factors involved in sound localization, few studies have actually tested out the methods used for obtaining the results. The chief concern in recent years has been about the physical criteria which determine localization, but lately also the subjective conditions under which observations have taken place have been discussed and investigated. So theoretically, at least, we are again reminded of the truism that results depend upon the methods used as well as upon the more obvious environmental influences. Facts are often functions of procedures.

Muscular Fixation In Voice Production Of The Stutterer Under Emotion, Lee Edward Travis

Proceedings of the Iowa Academy of Science

This study compared the changes produced in the voice of the stutterer under emotional conditions with the changes produced in the voice of the non-stutterer under like circumstances. These changes in voice were detected and studied by means of the photographic method of recording speech. Nineteen stutterers and eighteen non-stutterers were studied under identical circumstances.

Trapping Birds At Iowa City During 1924, Dayton Stoner

Proceedings of the Iowa Academy of Science

During the past year I have continued to maintain the bird trapping station in the back yard at my home in Iowa City for the purpose of securing birds for banding. This station was established in 1920 and has been in more or less constant operation since that time. By means of two government sparrow traps I have taken between January 1, 1924, and December 18, 1924, the period covered by this report, a total of 1 45 birds representing fourteen species. In 1923 a total of 112 individuals representing but six species was taken.

Winter Bird Records Of Chickasaw And Adjacent Counties, Chas. J. Spiker

Proceedings of the Iowa Academy of Science

The data here given were obtained between October, 1920, and January, 1925, and concern only the birds present during the winter months. For the most part, the author makes little attempt to designate subspecies, thinking this a difficult matter to get from field observation, and he prefers to hold rather closely to binomial nomenclature. All records for which no county is given are from Chickasaw County, and in only a few instances are any data given for territory not directly adjoining Chickasaw County, those being for Delaware County at the Devil's Backbone State Park. I visited this park on December …

An Ecological Survey, As A Means Of Obtaining A Background For Certain Morphological Problems, David T. Jones

Proceedings of the Iowa Academy of Science

The dissection of a specimen in the laboratory needs to be supplemented by a stimulating and enriching background gained in the field. Structure is to a greater or less degree associated with function, and, disregarding the disputed effect of environment upon heredity, changes in environment can modify the functioning of somatic structures in the lifetime of a single individual. Furthermore, a morphologist, who supplements his laboratory work with ecological observation, has the pleasure of seeing in action the structures with which he works, gains the perspective which his problem should have with other problems, and discovers further channels for research …

The Robber Crab (Birgus Latro) With Special Reference To Its Respiratory System, C. C. Nutting

Proceedings of the Iowa Academy of Science

The general appearance anatomy and habits of this crab are described briefly. The main part of the paper is devoted to a description of the very remarkable respiratory system which is more highly modified for aerial respiration than any other decapod crustacean. The relation of this form to the hermit crabs is pointed out.

Protein Requirements Of Lactating Sows With Litters, Q. W. Wallace, John M. Evvard

Proceedings of the Iowa Academy of Science

A number of experiments with lactating sows carried on various rations during the suckling period and continued until the pigs were 60 days old were conducted in the lactating sows with litter project at the Iowa Agricultural Experiment Station.

Vitamin A And Longevity, J. H. Hansbrough, V. E. Nelson, E. I. Fulmer

Proceedings of the Iowa Academy of Science

Experiments have been conducted to determine if protein, minerals and vitamin A are of equal importance for prolongation of life. One group of rats was fed on white corn alone. White corn is known to be deficient in protein, vitamin A and minerals. Rats on the above diet lived an average of 72 days. A second group of rats received a diet consisting of white corn 88 per cent together with casein 12 per cent. They lived an average of 75 days. A third group of rats received white corn 98 per cent, and 5 per cent of salt mixture. …

The Trapezius Muscle Of The Ganoid Fishes, H. W. Norris

Proceedings of the Iowa Academy of Science

119. The trapezius

There has been much uncertainty as to the occurrence of a trapezius muscle in the ganoids. Two distinct muscles have caused confusion - a levator of the fifth branchial arch and a true trapezius; both present in Amia (and probably in Polypterus Allis), but the trapezius vestigial. In Lepidosteus a functional trapezius occurs in the same relative position as the vestigial one in Amia. In Polyodon, Scaphirhynchus and Acipenser the trapezius is functional and is innervated by a branch of the ramus lateralis vagi that enters the latter from the vagus proper near …

Table Of Contents

Proceedings of the Iowa Academy of Science

No abstract provided.

Yeasts Of Carbonated Beverages, W. R. Turner

Proceedings of the Iowa Academy of Science

Fifty-one cultures of yeasts from 112 isolated from spoiled carbonated beverages were studied morphologically and culturally as a basis for a more extensive study and identification. Of these 28 were found to be spore formers, spores being formed on gypsum blocks and carrot slants. Twenty-four members of this group also produced spores on old malt extract agar slants. Sub-groups were made on the basis of surf ace growth on a liquid medium and on fermentation reactions.