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Some Protozoa Found In The Faeces Of Cattle, Elery R. Becker, W. W. Frye

Proceedings of the Iowa Academy of Science

A microscopic investigation of the faeces of cattle was undertaken in search of possible cyst forms of the numerous species of ciliates which inhabit the rumen and reticulum of these animals. Of the various workers who have searched for the cysts of these protozoa only one, Liebetanz (1910), reports success. His technique, however, was so open to adverse criticism, and his figures so unconvincing, that it is doubtful if even he really saw cystic forms.

Some Iowa Sandstone, Robert Hendricks, Nicholas Knight

Proceedings of the Iowa Academy of Science

Some years ago Dr. William H. Norton discovered a sandstone formation, about a third of a mile southeast of Lisbon in Linn County, Iowa. On the hillside it appeared as a small outcropping of a soft, light colored or white sandstone, fine-grained, weathering to yellow.

A Microphotometer For The Study Of Spectograms, I. J. Gwinn

Proceedings of the Iowa Academy of Science

A modification of Harrison's microphotometer has been developed, following his suggestion, which is used for accurate measurements of line widths on spectrograms. A vertical optical system using microscope lenses focuses the light on a bismuth-silver thermocouple. Accurate readings of length are obtained with a finely constructed micrometer screw. Studies have also been made on the relative intensities of lines on both optical and X-ray spectrograms. The instrument is also of use in testing the uniformity of thin films of metal.

Thermoelectric Effect In Single Crystals Bismuth, R. W. Boydston

Proceedings of the Iowa Academy of Science

Wires of single crystals of bismuth have been prepared by the Czrokalski method. The crystals so far investigated have been of orientations between 10° and 40°. The variations of the thermoelectric properties with orientation is rather slight in bismuth compared with similar effects in zinc as found by Linder, Grüneisen and Goens, and Bridgman.

The Phase-Theory As A Time Theory In Sound Localization, Otis C. Trimble

Proceedings of the Iowa Academy of Science

In a preliminary study of the phenomena of localization by the method of temporal difference of arrival of sound at the two ears, we find results which so nearly coincide with results obtained by Stewart (1) and by Halverson (3) who studied the problem by means of continuous sounds of varying phase relations at the ears, that we feel justified in presenting here the phase-theory as a time-theory in sound localization.

Notes On Iowa Fungi - 1925, G. W. Martin

Proceedings of the Iowa Academy of Science

Further notes on Iowa Amanitas

Molecular Space Array In X-Ray Diffractioin Halos In A Liquid: The Case Of Liquid Normal Primary Alcohols: The Cybotatic State, G. W. Stewart, Roger M. Morrow

Proceedings of the Iowa Academy of Science

For more than a decade (Debye and Scherrer, Nachr. Gesell. Göttingen (1916), p. 6) the X-ray circular diffraction halo in liquids has been known. Doubtless numerous times the suggestion has been made (vide Hewlett, Phys. Rev. 20 (1922), p. 688, and others) that there is in the liquid a spacial arrangement of molecules, probably as fragmentary crystals. But definite evidence of such a structure has been lacking.

The Field Of Protozoology In The Agricultural College, Elery R. Becker

Proceedings of the Iowa Academy of Science

There are many reasons why colleges of agriculture should offer an unusually fertile field for scientific exploitation by the protozoologist. It seems to me that the situation is a reciprocal one. In the first place, the agricultural college and the field it serves stand to benefit by any contributions made toward a solution of the many problems relating to agriculture in which the protozoa play a greater or less part. Secondly, the protozoologist will find in the numerous branches of agriculture not only a wealth of possibilities for valuable and interesting research, but also every promise of obtaining positive results, …

Some Errors In The Use Of Physico-Chemical Concepts In Physiology Of Bacteria, R. E. Buchanan

Proceedings of the Iowa Academy of Science

Several erroneous concepts as to the application of certain of the so called laws of physical chemistry to bacteriology are current in the literature pertaining to the physiology of bacteria.

The Influence Of Hydrogen Ion Concentration And Electrolytes Upon The Turbidity, Sensitivity And Settling Rates Of Certain Pleistocene Clays, Hoyt C. Graham, J. N. Pearce

Proceedings of the Iowa Academy of Science

The relative turbidity of the permanent colloidal suspensions from the different strata have been measured by means of a specially constructed tyndallmeter. The amount of clay which can be held in water suspension has been found to depend upon the stratum from which the clay was obtained, upon the hydrogen ion concentration, and upon the concentration of the electrolyte present in the suspension. In so far as the work has proceeded, we have found that the turbidity attainable is greater for the oxidized and leached strata than for the gumbotil; furthermore, for any one stratum, the maximum permanent turbidity is …

Photometric Measurements Of The Reflection Factor Of Cotton And Linen Household Materials, Earl C. Mccracken

Proceedings of the Iowa Academy of Science

By means of a specially constructed reflectometer measurements have been made on the variation of the reflection factor with different methods of laundering of both cotton and linen household materials. Results show that the method of washing has a decided effect upon the permanency of the whiteness as indicated by the total reflection factor. It was found that special precautions had to be observed in the taking of this particular type of data.

Psychology Of Drill Organization In Arithmetic Textbooks, O. S. Lutes

Proceedings of the Iowa Academy of Science

Six arithmetic textbook series have been analyzed with respect to the following eight fundamental aspects of their drill provisions.

An Apparently Very Old Prehistoric Camp Site, Ellison Orr

Proceedings of the Iowa Academy of Science

In the summer of 1924 the writer found along the Wisconsin shore of the Mississippi river, during a period of very low water, at a place about two miles south-east of Waukon Junction, Iowa, many small fragments of pottery, flint chips, and a couple of arrow heads.

Measurement Of The Quality Of Water, Jack J. Hinman Jr.

Proceedings of the Iowa Academy of Science

If the problem of the measurement of the quality of water were as simple as it was once held in the judicial opinion of the Mississippi jurist Doctor Mason tells about, (1) there would not be the slightest excuse for this paper. It was the opinion of the court that any ordinary mortal could judge for himself whether or not a water was satisfactory for drinking purposes.

The Adsorption Of Hydrogen, Ethylene And Ethane By Tin Oxide, Sylvia M. Goergen, J. N. Pearce

Proceedings of the Iowa Academy of Science

The adsorption of hydrogen, ethylene and ethane by tin oxide has been studied at several temperatures. Calculations of the adsorption magnitudes have been made on the assumption that helium is not adsorbed. The tin oxide used has been found to be very stable and is easily reproducible. The problem is being extended to include the study of the catalytic influence of the oxide upon the velocity of the reaction: C₂H₄ + H₂ ⇔ C₂H₆.

Notes On The Occurrence Of Oolitic Limestone In The Otis Beds Of The Devonian, Kenwood, Iowa, Glenn S. Dille

Proceedings of the Iowa Academy of Science

A very prominent outcrop of the Otis limestone occurs along the valley of Indian creek at a point known as Horse Thief Cave, about one-half mile south of the town of Kenwood, Iowa. At this place the exposed beds contain the characteristic Spirifer subumbonus Hall.

Experimental Test Of Maxwell's Distribution Law, J. A. Eldridge

Proceedings of the Iowa Academy of Science

While objections have been raised to all the proof of Maxwell's distribution law there is probably little question it represents approximately the statistical distribution of velocities among the molecules of a gas. It is remarkable, however, that a direct experimental verification had never been made until Stern and Gerlach showed that the law was substantially followed when silver atoms were evaporated from a silver wire. A somewhat closer verification is being attempted by a similar method using as the gas cadmium vapor at low pressure. There are several applications of such a "velocity filter" to problems of kinetic theory.

Direct Determination Of Thomson Coefficients In Single Crystal Zinc Rods, L. A. Ware

Proceedings of the Iowa Academy of Science

The Thomson coefficients for single crystal zinc as a function of the orientation of the principal crystal axis are being directly determined by Nettleton's method. For a rod with an orientation angle of approximately 45° the coefficient shows a rise with increasing temperature over the range 50-250° C.

The Mode Of Vibration Of The Human Vocal Cords, Wolfgang Metzger

Proceedings of the Iowa Academy of Science

Observation: Some of the models of the larynx used since the experiments of Johannes Mueller (when observed through the stroboscope) show transverse and alternate vibration. The question arises as to whether this is the mode of vibration of the real vocal cords or whether they rather vibrate synchronously and more in the lateral than in the transverse direction, as was assumed before.

General Bodily Tonus Of Stutterers And Non-Stutterers, Leo B. Fagan

Proceedings of the Iowa Academy of Science

Using an apparatus devised to measure muscular tonus as indicated by the resistance offered to an unexpected blow against the back of the free swinging hand, the muscular tone of stutterers and non-stutterers was studied under several conditions. For stutterers the conditions were (1) silence, (2) stuttering, (3) normal unobstructed speech; for non-stutterers (1) silence, (2) normal speech.

Histopathology Of The Thyroid Of The Guinea Pig In Experimental Scurvy, Katherine R. Day

Proceedings of the Iowa Academy of Science

Chronic scurvy was induced in guinea pigs by a diet of dried foods supplemented by 0.25 cc to 5 cc orange juice given daily per os by means of a pipette. Animals of as nearly the same age and weight as possible were selected. The sexes were divided equally between control and experimental groups.

College Circular [Catalog] 1927, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

Calendar for 1927-28 ... 5
Officers of Administration and Instruction ... 6
Faculty ... 7
General Information ... 45
Expenses and Fees ... 46
Scholarships ... 48
Extension Service ... 48
College Organizations ... 48
Faculty Organizations ... 49
Training in Actual Teaching ... 49
Public Lectures and Entertainments ... 50
Boarding and Lodging ... 50
Employment of Students ... 51
Twelve Weeks Normal Training ... 52
School Credits in Lieu of Certificate Examinations ... 52
Examinations for Teachers Certificates ... 53
Bureau of Recommendations ... 53
Advisers and Amount of Work ... 53
Credits, Grades, Grade …

Correlation Of Neatness And Scholarship In Physics, George E. Davis

Proceedings of the Iowa Academy of Science

353 reports, written by 33 students in three laboratory sections of junior physics, were graded as to neatness. The average neatness grade and the term laboratory grade for each student were used in a correlation study. For each of the three laboratory sections the correlation coefficient was positive. The coefficient for all 33 students was + 0.27. Although the number of students graded was small, we may conclude that in general we may expect neatness and high grades in physics to be associated. Exceptions to the rule and a low correlation coefficient both definitely indicate that neatness of written reports …

The Relation Of Certain Medical And Physical Data To Scholastic Success, Frederic S. Beebee

Proceedings of the Iowa Academy of Science

The purpose of this study is to find what factors, if any, in physical development, habits, medical history, medical examination, and physical efficiency are of significance in relation to scholastic standing. It is based on the records of two groups of 1925-1926 male freshmen. The first group was composed of those men receiving the highest grade-point averages in the entire class of nearly 700. The other group was composed of those men in the class receiving the lowest grade-point averages during the same period. The group receiving high averages numbered fifty-two. The group receiving low averages numbered fifty-four. As selected, …

Title Page - Front Matter

Proceedings of the Iowa Academy of Science

No abstract provided.

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

Proceedings of the Iowa Academy of Science

No abstract provided.

Cedar River At Cedar Rapids, Iowa, C. O. Bates, H. R. Hendricks

Proceedings of the Iowa Academy of Science

For thirty-seven years we have noted with regret the gradual increase in the pollution of our river, in fact the increase has been quite rapid during recent years. During that time the inhabitants on the banks have increased three-fold while the amount of pollution that is put into the river has increased probably three-thousand-fold. A third of a century ago the Chlorine as Chlorides was three parts per million, the normal amount for unpolluted water in this region; now it is ten. A half a century ago when the Cedar Rapids water works were first built, raw water was put …

Observations Of Plant Diseases In Iowa From 1924-1926, Joseph C. Gilman, D. R. Porter

Proceedings of the Iowa Academy of Science

The diseases of plants especially those diseases due to the invasion of parasites are always markedly influenced by the environment and therefore any discussion of their occurrence in a stated period must also involve a discussion of the weather during that period. According to the reports of Reed,¹ the season of 1924 was characterized by a dry, cool spring, a rainy June and a cool summer. August was normal in temperature but with frequent heavy rains and September was unusually and persistently cool.

An Electrical Stimulus Which Can Be Accurately Measured, Thomas H. Howells

Proceedings of the Iowa Academy of Science

The difficulty encountered in the past with any technique involving the use of an electrical stimulus has been that of obtaining a stimulating current which could at once be easily varied and accurately measured. In order to make it possible to vary the necessarily high voltage involved, an induction coil or transformer was usually used as the source of electrical current. Since these instruments have an alternating current output it is therefore difficult to obtain a meter capable of measuring the very small current that can be used as a stimulant. The ordinary A. C. meters are not adapted for …

A Study Of The Unsuccessful College Student, E. O. Finkenbinder

Proceedings of the Iowa Academy of Science

This study attempts to discover (1) by the use of tests, the student's mental ability, (2) by observation of him at work, the type of procedure he employs in his study, (3) by the analysis of his daily routine, his economy of energy expended, and (4) by the analysis of his college grades in comparison with his ability, which subjects are most successfully carried by him, best fitted to his type of mentality and habits of study.