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The Conductivity Of Cod Liver Oil, L. W. Butler Jan 1929

The Conductivity Of Cod Liver Oil, L. W. Butler

Proceedings of the Iowa Academy of Science

Experiments have been conducted on the conductivity of cod liver oil under different conditions. These experiments were carried out in a conductivity cell using brass plates placed in some instances about.003 inch apart and at other times at about.020 inch. The temperature of the oil was raised to approximately fifty degrees Centigrade and allowed to cool slowly to three or four degrees below zero Centigrade, readings on the conductivity being made at frequent intervals. The conductivity decreased as the temperature was lowered, the decrease becoming very rapid at the lower temperatures. When the temperature was raised, the conductivity increased, the …

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Peltier Effect In Single Crystals Of Bismuth, H. D. Fagan Jan 1929

Peltier Effect In Single Crystals Of Bismuth, H. D. Fagan

Proceedings of the Iowa Academy of Science

Some preliminary data on the Peltier Effect in bismuth single crystals have been obtained. The reference metal used is copper. The results so far obtained seem to be in fair agreement with the data computed from the thermal e.m.f. measurements of Boydston and Bridgman.

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Improved Apparatus For Growth Of Metal Crystals, A. G. Hoyem Jan 1929

Improved Apparatus For Growth Of Metal Crystals, A. G. Hoyem

Proceedings of the Iowa Academy of Science

Some preliminary data on the Peltier Effect in bismuth single crystals have been obtained. The reference metal used is copper. The results so far obtained seem to be in fair agreement with the data computed from the thermal e.m.f. measurements of Boydston and Bridgman.

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A Simple Refrigeration System For The Farm, L. V. Crum Jan 1929

A Simple Refrigeration System For The Farm, L. V. Crum

Proceedings of the Iowa Academy of Science

The object has been to find a cheap and efficient method of storing and insulating ice which might be used for cooling purposes on the farm. A large tank was filled with a solid cake of ice by adding a small amount of water each evening during cold weather. The cooling chamber consists of a small compartment directly beneath the metal base of the tank, and is well insulated from outside effects.

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X-Ray Diffraction By Organic Solutions, Alfred W. Meyer Jan 1929

X-Ray Diffraction By Organic Solutions, Alfred W. Meyer

Proceedings of the Iowa Academy of Science

Series of ionization diffraction curves of two organic solutions with varying concentrations were obtained using Mo Ka radiation. The solutions used were normal butyl alcohol with orthodimethyl-cyclohexane and normal ethyl alcohol with cyclohexane. The diffraction peaks were found to shift from the peak of one member to that of the other as the solution was changed from 100% of one member to 100% of the other. Also the width of the peak was found to vary in the same manner with the exception that the width was a maximum at a low percentage of the liquid, the peak of which …

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Resistance Change In A Magnetic Field Of Single Crystals Of Bismuth, Roy A. Nelson, G. R. Watson Jan 1929

Resistance Change In A Magnetic Field Of Single Crystals Of Bismuth, Roy A. Nelson, G. R. Watson

Proceedings of the Iowa Academy of Science

The work is a continuation of that of Schneider. Crystals were made from several different samples of bismuth and by two methods. The fractional change in a longitudinal field of about 3,000 gauss is found to be a minimum for 0 orientation and a maximum for 90. The crystals, however, fall into two classes, the reason for which has not been determined. The supposition of any considerable fissures along the cleavage planes appears unlikely.

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Molecular Structure Of Benzene, Cyclohexane And Their Derivatives - A Study In X-Ray Diffraction, G. W. Stewart Jan 1929

Molecular Structure Of Benzene, Cyclohexane And Their Derivatives - A Study In X-Ray Diffraction, G. W. Stewart

Proceedings of the Iowa Academy of Science

An examination by the x-ray diffraction ionization method was made of benzene, toluene, o-, m- and p-xylene, mesitylene, ethyl benzene and isopropyl benzene; cyclohexane, methyl cyclohexane, o-, m- and p-dimethyl cyclohexane; phenol, aniline, cyclohexanol and cyclohexanone; 2 hydroxy 1-3 dimethyl benzene and three isomers, o-, m- and p-toluidine, and o-, m- and p-cresyl methyl ether. The diffraction peaks are taken to be caused by the semi-orderly space arrangement of the molecules in the liquid, or cybotactic condition, and the distances of separation of the planes containing diffraction centers are computed by Braggs' diffraction law. Both assumptions …

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Diffraction Of X-Rays In Liquids: Effect Of Temperature, E. W. Skinner Jan 1929

Diffraction Of X-Rays In Liquids: Effect Of Temperature, E. W. Skinner

Proceedings of the Iowa Academy of Science

Using an x-ray spectrometer similar to that used by G. W. Stewart, experiments are being carried out on the effect of varying temperature on liquid scattering, temperatures varying from room temperature to near the boiling points being used. To date, two liquids, cyclohexane (27°C and 83.5°C) and heptyl (heptylic) acid (28° C and 193° C) have been examined. Results and conclusions are as follows.

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A Molecular Velocity Filter, John A. Eldridge Jan 1929

A Molecular Velocity Filter, John A. Eldridge

Proceedings of the Iowa Academy of Science

A method has previously been described by which the velocity of molecules could be measured. A qualitative combination of Maxwell's distribution law was obtained. A filter is being constructed which will have much greater resolving power and also greater sensitivity.

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Intensity Of Mercury Lines Excited By Positive Ions, C. Frische Jan 1929

Intensity Of Mercury Lines Excited By Positive Ions, C. Frische

Proceedings of the Iowa Academy of Science

Observations were made concerning the intensity of lines of the mercury spectrum as excited by positive ions. The results were compared with corresponding data on the electron spectrum given by previous observers. Intensity measurements were made with a microphotometer.

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The Evaluation Of The Musical Capacity Of Nursery School Children, Thomas F. Vance, Medora Grandprey Jan 1929

The Evaluation Of The Musical Capacity Of Nursery School Children, Thomas F. Vance, Medora Grandprey

Proceedings of the Iowa Academy of Science

The elements in the situation which focused attention upon the possibility of evaluating the musical capacity of nursery school children by a method which might have some approach to reliability were three-fold: an enrollment of thirty-one children, a number of which were almost invariably eager for and interested in the musical phase of the nursery school program; a teacher whose musical ability was considerably above the average, with a professional interest in a problem of this kind; and a psychologist on the staff also interested in the problem.

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Some Factors Involved In Motivation, Nira M. Klise Jan 1929

Some Factors Involved In Motivation, Nira M. Klise

Proceedings of the Iowa Academy of Science

The experiment which is reported was conducted during the fall and winter quarters at Iowa State College. An attempt to increase speed of tapping was made with nine different groups of college students, all of them as nearly identical as possible.

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A Study Of Antagonistic Habits, Martin F. Fritz Jan 1929

A Study Of Antagonistic Habits, Martin F. Fritz

Proceedings of the Iowa Academy of Science

A single rat given 6000 trials (50 trials per day) for a period of four months on a dual choke apparatus, showed no ability to reduce the time in turning from one learned stimulus (a light) to the opposite stimulus (no light). No evidence of insight was found but merely rote or mechanical learning. A human being would probably solve such a problem quickly by means of verbal cues. A possible interpretation that the old habit is not "torn down" but only inhibited or suppressed. Same results found with three other rats given 2000 trials each.

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The Project Method In Laboratory Psychology, R. H. Sylvester Jan 1929

The Project Method In Laboratory Psychology, R. H. Sylvester

Proceedings of the Iowa Academy of Science

Of course every experiment is a project, literally, but usually there are two outstanding weaknesses. One is the failure to connect the study closely with other courses and to bring general lecture and text-book material to bear upon the experiments. The other is the tendency to follow directions literally with eyes and hands, with but little real cerebration.

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Snake Notes, J. E. Guthrie Jan 1929

Snake Notes, J. E. Guthrie

Proceedings of the Iowa Academy of Science

During the past six years there has been a rather unusual opportunity at the Department of Zoology and Entomology of Iowa State College for the study of snakes in captivity. By capture, donation, exchange and purchase, many specimens of more than fifty species have at different times been occupants of our cages. Of these, twenty species were natives of this state and included all but a few rare species of our snake fauna.

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Segmentation In Earthworms, Resulting From Inability To Regenerate A Portion Of The Ventral Nerve Cord, F. L. Fitzpatrick, S. L. Stolba Jan 1929

Segmentation In Earthworms, Resulting From Inability To Regenerate A Portion Of The Ventral Nerve Cord, F. L. Fitzpatrick, S. L. Stolba

Proceedings of the Iowa Academy of Science

The first of the two following experiments was performed in 1927-1928. Thirty-five sexually mature earthworms (Lumbricidae) were put under the influence of ether. Anesthesia was resorted to so that the subjects would remain inactive during the subsequent operation. A tiny incision was made in the ventral body wall of each specimen, at a point just posterior to the clitellum. The ventral nerve cord was then severed with a fine pointed scissors. It will be noticed that the place of operation was posterior to the more important organs of the body. It was selected as such for the foregoing reason and …

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Relative Ability Of Anterior And Posterior Ends Of The Body To Regenerate In Earthworms, F. L. Fitzpatrick Jan 1929

Relative Ability Of Anterior And Posterior Ends Of The Body To Regenerate In Earthworms, F. L. Fitzpatrick

Proceedings of the Iowa Academy of Science

The following experiments were begun in July, 1928. They were anticipated to some extent by preliminary experiments performed in conjunction with Mr. E. I. Solomon, a major honors student at Coe College two years ago. Prof. T. H. Morgan carried out somewhat similar experiments on the regenerative powers of short pieces cut from the posterior ends of worms. (presumably Allolobophora foetida).

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Cliff Swallow Colonies In Iowa, W. F. Kubichek Jan 1929

Cliff Swallow Colonies In Iowa, W. F. Kubichek

Proceedings of the Iowa Academy of Science

Available literature on the Cliff Swallow (Petrochelidon lunifrons) indicates that at present this species is not as abundant as it was formerly and that no very large colonies have recently been reported from Iowa. A colony worth reporting is located five miles northwest of Oxford, Johnson Co., Iowa. A large barn with its wide eaves has served as a supporting structure for their mud nests for many years. The fact that most of the nests were on the east side of the barn was due, perhaps, to the proximity of a creek in the barnyard. On this side the writer …

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The European Starling In Iowa, W. F. Kubichek Jan 1929

The European Starling In Iowa, W. F. Kubichek

Proceedings of the Iowa Academy of Science

The first record of introduction of the European Starling (Sturnus vulgaris) into the Unitcd States was at Cincinnati, Ohio in 1872. However, the attempt to bring this old world bird into the country at this time was unsuccessful. Unable to adapt themselves to the new surroundings they soon all died, and it was not until 1890 when Eugene Scheifflin is credited with having released eighty of the birds in Central Park, N. Y. City, that a successful introduction was made.

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The Sex Ratio In Guinea Pigs, R. G. Schott Jan 1929

The Sex Ratio In Guinea Pigs, R. G. Schott

Proceedings of the Iowa Academy of Science

The relative proportions of the sexes appearing in a total of 2,014 guinea pigs in the colony of the Department of Genetics, Iowa State College, over a six-year period have been studied. The ratio of males for the 2,014 animals was 49.4%. This is a close approach to the expected 50:50 relationship of the sexes as postulated by the sex-chromosome mechanism. Considerable seasonal fluctuation in the ratios were observed, but these are not consistent throughout the period. Age of parents, litter size, and litter sequence have no marked effect on the sex ratio.

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The Inheritance Of Leg-Feathering In The Chicken, W. V. Lambert, C. W. Knox Jan 1929

The Inheritance Of Leg-Feathering In The Chicken, W. V. Lambert, C. W. Knox

Proceedings of the Iowa Academy of Science

The inheritance of leg-feathering in crosses of the Black Langshan (feathered) with the White Plymouth Rock and Buff Orpington breeds (non-feathered) has been found to be dependent upon two dominant duplicate factors (S1 and S2). This relationship has been verified from data secured from F2 and backcross generations. Of five F1 males used in these studies three proved to be heterozygous for both factors S1 and S2 and two for but one of these factors, while six F1 females proved to be heterozygous for both factors and ten for but one factor. …

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Autumn Term Commencement [Program], December 4, 1928, Iowa State Teachers College Dec 1928

Autumn Term Commencement [Program], December 4, 1928, Iowa State Teachers College

UNI Commencement Programs

The program of the commencement ceremonies, including a list of institutional leadership, a list of the departments by college, awards given at the ceremonies, and a list of undergraduate and graduate degree candidates.

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What Are We Teaching In Biology?, C. W. Lantz Dec 1928

What Are We Teaching In Biology?, C. W. Lantz

Science Bulletin

This subject in order to be of real value must be an actual study of plants and animals. I have observed in my teaching that pupils, when given recognition characters of trees, may be able to pass a satisfactory examination on these characters, but fail to recognize the trees they describe when they see them in the field. They have simply memorized words that mean nothing to them.

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Stress Pertinent Facts In Health Teaching, Belva W. Swalwell Dec 1928

Stress Pertinent Facts In Health Teaching, Belva W. Swalwell

Science Bulletin

In the past, much of the health information which high school pupils acquired was handed down to them traditionally. They listened to what their elders had to say and seldom questioned the validity of it. Assertions to the effect that a buckeye carried in one's pocket would prevent rheumatism; that a piece of salt fat pork bound about the neck would counteract diphtheria; or that some malodorous substances would, if breathed, ward off certain communicable diseases were considered as truths and were passed on to the next generation. Since health is now taught in our high schools by teachers adequately …

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Highway Signs In Science Teaching, Winifred Gilbert Dec 1928

Highway Signs In Science Teaching, Winifred Gilbert

Science Bulletin

Let me assume that the General Science teachers of the state have been well prepared for their work and that at the present time they are more or less efficient teachers. Still there is the ever present task of keeping up with the curricular and learning studies that are going on in the field of General Science. New texts are appearing, yearly, new studies on content and methods seem to be on the increase and it takes rather nimble stepping on the part of the teacher to keep pace.

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Science Bulletin, Vol.1 No.2, December 1928 [Complete Issue] Dec 1928

Science Bulletin, Vol.1 No.2, December 1928 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

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A Correspondent Reminds Us . . . Dec 1928

A Correspondent Reminds Us . . .

Science Bulletin

A correspondent reminds us that some teachers of science leave the impression in the class that our present knowledge of science was given to the world ready made or grew out of the presses that printed the text.

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Editorially Speaking Dec 1928

Editorially Speaking

Science Bulletin

We greatly appreciate the friendly comments on the first issue of the SCIENCE BULLETIN from our readers; and we have tried to answer your questions. In these first issues we are of necessity "feeling our way in the dark". You only, friendly reader, can give us light.

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Laboratory Equipment And Experiments For Determinations Of Density, L. Begeman Dec 1928

Laboratory Equipment And Experiments For Determinations Of Density, L. Begeman

Science Bulletin

Laboratory experiments in Density require the following apparatus: beam balances, meter sticks, graduates, calipers, tumblers, test tubes, and hydrometers. There should be as many of each as possible· in order to reduce the amount of group work. The objects for study should include pieces of lead, zinc, marble, paraffin, beeswax, glass stoppers, shot, gasoline and solutions of salts such as blue vitriol.

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Hydrostatics, L. Begeman Dec 1928

Hydrostatics, L. Begeman

Science Bulletin

The teacher may introduce this subject to the class by reference to the meaning of "pressure" as used in mechanics. Explain to them that the gauge pressure in a steam boiler or auto tire refers to the number of pounds pressure on each square inch of inner surface. Sometimes a problem will make it clear.

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