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The Interfacial Tensions Of Mineral Oil Against Various Aqueous Solutions At 40°C, W. G. Eversole, Dallas S. Dedrick

Proceedings of the Iowa Academy of Science

A new and highly improved apparatus for the direct measurement of interfacial tensions by the drop weight method has been devised. By means of an automatic recording device, measurements may be conveniently made on larger volumes and at slower dropping speeds than were heretofore possible. This is particularly valuable when measuring interfacial tensions between liquids containing surface active solutes.

Nitrogen Trichloride And Grignard Reagents, George H. Coleman, Marion A. Buchanan

Proceedings of the Iowa Academy of Science

Nitrogen trichloride reacts with Grignard reagents to produce primary amines, ammonia, and a small amount of secondary amines. No tertiary amine was isolated. The percentage yield of these products obtained in a typical reaction with n-butyl magnesium chloride were as follows: n-butyl amine 35%, ammonia 15%, and di-n-butyl amine 3%.

The Composition Of The Unsaturated Fatty Acids Of Animal Tissues, H. G. Smith

Proceedings of the Iowa Academy of Science

Very little information is available as to the composition of the unsaturated fatty acids of animal tissues, especially as regards the location of the double bonds. This is a report of preliminary experiments on the fatty acids of beef heart muscle and liver. The unsaturated acids were separated by two methods, crystallization of the bromine derivatives and fractional distillation of the methyl esters. The method of Armstrong and Hilditch was used for the oxidation of the unsaturated acids and the results obtained up to this time indicate that the first double bond nearest the carboxyl group is in the 9:10 …

The Micro Determination Of Citric Acid By The Thunberg Methylene Blue Method, Adrian C. Kuyper

Proceedings of the Iowa Academy of Science

The method depends on the specific property of citric acid as a hydrogen donator in accelerating the decolorization of methylene blue by an enzyme found in cucumber seed. It gives reliable results only when enzyme extracts are prepared in the same way and used at the same age. Sodium, calcium and hexose-diphosphate do not interfere unless present in concentrations higher than those found in the blood. Oxalic acid does interfere because it changes the minimum amount of citrate necessary for maximum speed of decolorization. The sensitivity is directly proportional to the amount of methylene blue present in the reaction tube.

Effect Of Air Pressure On The Vibration Of Quartz Crystals, George E. Thompson

Proceedings of the Iowa Academy of Science

A quartz crystal which controls an oscillator is placed in a chamber which may be evacuated. The output of the oscillator increases as the air pressure is reduced.

A Study Of The Mathematical Disabilities Of Students Pursuing First Year College Physics, W. R. Lueck

Proceedings of the Iowa Academy of Science

This study is in progress at the present time and hence the report is concerned only with such aspects as have been completed. The Compass Survey Test in Arithmetic (Advanced Examination) and the Douglass Diagnostic Test in Elementary Algebra were given to 282 students pursuing freshman physics in five colleges. The disabilities indicated by these tests were classified and tabulated. In addition to the above, the daily, weekly, and other tests given by the instructors in these colleges to the students concerned were obtained and the disabilities indicated thereon were classified and tabulated. Each student also solved a selected list …

The Color And Intensity Of The Chemiluminescence Of Solid Sodium, R. M. Bowie

Proceedings of the Iowa Academy of Science

The fact that solid sodium reacts with the moisture in the air to produce a faint glow has been known for years. The color of the light was said to be greenish and its intensity extremely low; however, no measurements had been made. In this article, a method is described for determining its intensity by means of a photoelectric cell. The determination of the spectrum of the light as obtained both by filters and spectrographically is described. The intensity was found to vary from 3.57 to 10.5 x 10^-7 lumens per square inch of metal surface while the spectrum …

An Investigation Of The Basic Factors Of Aesthetic Value In Costume Design, Wilhelmina E. Jacobson

Proceedings of the Iowa Academy of Science

The general object of this investigation is to determine experimentally the basic factors underlying beauty in costume. The problem has three stages: (1) the determination of what factors of aesthetic value are involved in costume design; (2) which of these factors are basic; and (3) why they are basic.

A Study Of Fifty Home Libraries With Special Reference To Their Function In Child Development, Gertrude Hill Nystrom

Proceedings of the Iowa Academy of Science

A random sampling of fifty home libraries was made in a city of 6,000 population. The mothers were interviewed in their homes, and their libraries were examined by a person trained in library science and child study. Emphasis is given to the child development materials found in the homes, including child study books and magazines, and children's books and magazines. The evaluation of the reading materials is both quantitative and qualitative. Results are tabulated according to nativity of parents, occupational class, educational status of parents, and number of children in the family. Large charts present the core of the results …

A Study Of The Tenebrionidae Of Southeastern Iowa, Owen J. Smith

Proceedings of the Iowa Academy of Science

In his study of the Iowa Tenebrionidae the writer has classified specimens collected throughout the state both by students of Iowa Wesleyan College and by himself. These specimens are in the collection of Iowa Wesleyan College.

The Ancient House People Of The Brush Creek Region, In Northeastern Utah, Albert B. Reagan

Proceedings of the Iowa Academy of Science

The Brush creek region is on the southeastern tip of the Uintah mountains, east of Green River, in northeastern Utah. Here, and in the Greendale district over the mountains to the northwestward, a house building people built their houses in the ages long ago. However, they were not the first people in the region; for they had been preceded by the Basket Makers who left their crudely made, square-shouldered pictographs of human beings on the cliff walls, and by an earth-lodge Puebloan people who left at least six earth-lodge villages to attest their having been in the region.

Measurement Of Mean Life Of Cadmium 2^3p1 By Thermal Motion Of Excited Atoms During Life Time, H. D. Koenig

Proceedings of the Iowa Academy of Science

Since the experiments of Dunoyer in 1914 some interest has developed in an experiment to show the diffusion of excited atoms in various types of resonance lamps. None of these have been successful due to the short life time of the excited states in the vapors selected. Since experiments made in this laboratory indicate a long life for the Cadmium 2³P₁ state, an attempt was made to measure the life of this state by the motion of the excited atoms in a unidirectional beam shot from a gun of the boiler type, and excited by passing through …

The Spectrum Of Mercury Excited By Canal-Ray Impact, Carl Frische

Proceedings of the Iowa Academy of Science

The spectrum of mercury is excited by hydrogen canal rays. The velocity of the canal rays is regulated by the voltage applied to a discharge tube and the canal-ray particles are allowed to shoot through a small hole in the cathode. Spectrograms were taken at voltages ranging from 1000 to 12,000 volts and the general characteristics of the spectra were studied. The spectra thus excited had very much the same characteristics as the electron spectrum just below ionization with the exception that several spark lines appeared at the lower voltages. The spark lines became more prominent as the voltage was …

The Alumnus, V15n1, January 1931, Iowa State Teachers College

The Alumnus

Inside This Issue:
-- School Bell Calls Alumni To Annual Dinner
-- Iowa's First "Superior School" Teachers Honored At Annual College Dinner as Former Students
-- Sixty-One Enter Ranks Of Alumni At Fall Term
-- Faculty String Quartet Draws High Praise
-- Debaters Meet Foreign School For First Time
-- Fourteenth Conference Attracts Alumni
-- Fall Play Is Seventeen Scene Extravaganza
-- Grand Scale Benefit for Memorial Theatre
-- Iowa Teachers, Their Problems and Opportunities
-- News Items of the College
-- Cagers Open Season With Decisive Victory
-- The Varsity Football Squad of 1930
-- Stiff Schedule Seasons Gridders …

College Catalogue 1930-1931, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

Calendar for 1931-32 ... 5
Officers of Administration and Instruction ... 6
Faculty ... 7
General Information ... 25
Historical Sketch ... 25
Buildings and Grounds ... 25
Enrollment ... 28
Expenses ... 28
Employment of Students ... 30
Loans ... 30
Student Organizations and Activities ... 31
The Lecture Course ... 32
The Placement Bureau ... 32
Entrance Requirements ... 33
Admission with Advanced Standing ... 34
Advisers and Amount of Work ... 35
Absences and the Making up of Work ... 35
General Requirements for Graduation ... 36
County Certificates ... 37
State Certificates ... …

The Story Of Iowa, Thomas P. Christensen

Iowa Book Gallery

A history of the state of Iowa up through the 1920s, written especially for children.

Trenton Limestone In Iowa, Charles Keyes

Proceedings of the Iowa Academy of Science

Of late, stratigraphic taxonomy and correlation take on new trend from that to which the last generation is accustomed. They neither go to the paleontological extreme in which the life-zones are regarded as passing around the globe like the successive skins of an onion, nor do they severely restrict themselves to the lithologic, or "mapping unit" extreme, in which faunas are largely, if not entirely, ignored. As in so many cases in science generally the truth really lies somewhere midway between the extremes. But the new trend has altogether different basis from that presumed for the old. It is diastatic …

Analysis Of Intensity In Piano Playing, D. A. Rothschild

Proceedings of the Iowa Academy of Science

By means of the Iowa Piano Camera, which gives an objective record of movement of the keys of the piano, and a vacuum tube volt-meter, which measures changes in intensity on the decibel scale, we are able to measure changes in the action, and intensity changes of the piano, that is, we are able to study the relation of the intensity changes of the piano to that of the action.

Influences On Learning Of Tests Composed Of True And False Statements And Direct Questions, E. O. Finkenbinder

Proceedings of the Iowa Academy of Science

Eighty points in psychology were written in each of the four types of questions, mentioned in the title, and presented to 92 college students at three different times within six weeks to see which type of question would be attended by the greatest amount of learning and also which would be retained best. There were four groups of students. Each had all four types of questions, but no two groups had any one of the questions in the same type. If one group had a true statement of a given question, another group had that same point presented in a …

The Oxidation Of Nitrogenous Material In Contaminated River Water, Ben H. Peterson, John Hann

Proceedings of the Iowa Academy of Science

A study is made of the rate of oxidation of the nitrogenous material in water taken from the Cedar River above, within and below the city of Cedar Rapids. Some of the carbonaceous material is first oxidized, requiring all of the dissolved oxygen if the sample is highly polluted. If sufficient dissolved oxygen remains, the free ammonia is converted to nitrite form accompanied by a change of the organic nitrogen to ammonia. When nearly all the nitrogen is in nitrite form, further oxidation to nitrate nitrogen occurs.

1931 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.

Some Misunderstood Slime-Mold Species, Ella Baskerville

Proceedings of the Iowa Academy of Science

The slime-molds with which this discussion is concerned belong in the order Trichiales in the classification of Macbride, in the sub-order Calonemineae of that of Lister. Whatever name we give the group, it is characterized by being endosporous, limeless or nearly so, with spores pallid or yellowish. A capillitium is present, often abundant, with roughened or sculptured walls.

Photosynthesis In Corn, W. E. Loomis, K. H. Burnett

Proceedings of the Iowa Academy of Science

Studies on the photosynthetic efficiency of corn conducted in the Department of Botany at Ames have several indications.

The Adsorption Of Negative Ions By Colloidal Suspension Of Aluminum Hydroxide, Ben H. Peterson, Floyd H. Trimble

Proceedings of the Iowa Academy of Science

The adsorption of Ferricyanide and Oxalate ions by colloidal aluminium hydroxide at concentrations below and above the coagulation values is measured. The plot of the amount adsorbed as a function of the total concentration of the electrolyte shows three characteristic "breaks." The results are of the same general type as obtained by Storks in the adsorption of the Chromate ion by the same suspension. The adsorption is considered as of two types; first, a neutralization of the positive charges on the colloidal particle, followed by surface adsorption by the coagulated particle. The second "break" is due to a combination of …

The Velocites Of Hydrolysis Of Mono- And Polyhydroxy-Diphenyl Ketimines, James B. Culbertson, James L. Nauman

Proceedings of the Iowa Academy of Science

The velocities of hydrolytic decomposition of the three monohydroxy-diphenyl, the resorcyl phenyl and the phloroglucinyl phenyl ketimine hydrochlorides have been measured. As a result of these measurements it has been found that the phenolic group in the 2- and 4-positions in the monohydroxy diphenyl ketimines gives rise to a marked retardation of the hydrolysis velocity compared with that of diphenyl ketimine, while the velocity of the 3-hydroxydiphenyl ketimine was even faster than that of the diphenyl ketimine.

Competition For Marks, John W. Charles

Proceedings of the Iowa Academy of Science

This study compares the marks of lower class men with those of upper class men in the same courses. It was found that Freshmen experience greater difficulty in comparison with their older classmates than any other class does. Seniors fall slightly below the standards set by Juniors.

The Vibrato As Produced On String Instruments, Scott N. Reger

Proceedings of the Iowa Academy of Science

This study is concerned with the production of the vibrato on the violin, viola, and violincello. Comparisons are made with the voice vibrato throughout. The methods of producing the string vibrato physiologically and mechanically are considered.

An Analysis Of Fifty Delinquent Boys' Feelings Of Inferiority And Superiority, Edwin C. Johnson

Proceedings of the Iowa Academy of Science

By the use of tests a group of boys showing decided inclinations toward feelings of superiority or inferiority was selected from the Iowa Boys Training School at Eldora. The members of this group were interviewed, and the boys' own stories obtained. Comparisons were made with the judgments of the teachers and the case records. An analysis of the resulting pictures suggests definite lines for further investigation.

Collecting Contests As A Means Of Increasing Student Interest In Biological Subjects, H. E. Jaques

Proceedings of the Iowa Academy of Science

For some twenty years the author has been organizing contests among his students in Botany, Zoology, Bird Study, Tree Study and Entomology as a means of encouraging a greater interest in field work with better observation and more intelligent understanding. Some of the schemes employed may at first glance seem childish. That the plan gets results is attested by the working knowledge of plants and animals acquired by these students and what they have been able to do with this knowledge as teachers, research workers and in other fields since leaving college.

Experiments With The Winogradsky Spontaneous Culture Test On Iowa Soils, Arthur W. Young, R. H. Walker

Proceedings of the Iowa Academy of Science

Winogradsky in 1925 developed the spontaneous culture method for studying the occurrence and activities of the aerobic non-symbiotic nitrogen fixing organisms in the soil. Using this method in conjunction with the silica gel method he was able to determine the nitrogen fixing power of the soil and the relative number of soil micro-organisms which will grow on the surface of the spontaneous culture plates. These organisms Winogradsky believed represented the aerobic non-symbiotic nitrogen fixing organisms of the soil and members of the Azotobacter genus were very prevalent in the colonies which developed.