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In Memoriam: Bird Thomas Baldwin; J. M. Fulton; John Littleton Tilton; Flora May Tuttle; M. F. Arey; Abram Owen Thomas; Joseph A. Treganza; Louis H. Pammel, George D. Stoddard, Charles Keyes, Henry S. Conrad, E. J. Cable, James H. Lees, B. Shimek

Proceedings of the Iowa Academy of Science

No abstract provided.

The Production Of Kynurenic Acid From Tryptophane Derivatives, Clarence P. Berg

Proceedings of the Iowa Academy of Science

Tryptophane, when administered to certain animals, is converted into kynurenic acid. Use has been made of this fact in the study of possible cleavage of tryptophane derivatives in the alimentary tract and in the body proper.

Ultra Violet Absorption Spectra Of Carotene And Vitamin A, Jay W. Woodrow, J. B. Philipson

Proceedings of the Iowa Academy of Science

Using a sensitive photo electric spectrophotometer, carotene derived from carrots and dissolved in an oil, has been found to exhibit an absorption band in the region 325-330 Mμ. An absorption band in this region has been shown by Morton & Heilbron to be characteristic of vitamin A in fats derived from animal sources. The appearance of this band in carotene from a vegetable source, establishes an even closer relationship between these two growth-promoting factors.

Exchange Of Oestrous And Corpus Luteum Hormones In Parabiotic Female Rats, Robert T. Hill

Proceedings of the Iowa Academy of Science

Normal female rats in parabiosis have a tendency to run oestrous cycles independent of each other. Though sufficient hormones are exchanged to disturb somewhat the oestrous cycles of each twin member this interference does not result in synchronized cycles. During pregnancy of one of the twins the oestrous cycle of the non-pregnant animal is almost entirely inhibited by the action of the corpus luteum hormone from the pregnant member. This same phenomenon persists after parturition as long as the mother nurses her litter, which must be due to the activity of the hormone of corpus luteum of lactation. Also the …

Instinct Or Intelligence In The Great Golden Digger?, Roy L. Abbott

Proceedings of the Iowa Academy of Science

"

To know everything and to know nothing according as it acts under normal or exceptional conditions: that is the strange antithesis presented by the insect race." So said that profound student of insects, Fabre, after an immense amount of experimentation. No one has written so entertainingly about insects as has this great Frenchman; few have equaled and none excelled him in the wealth and variety of his observations upon them. But he was trained as a physicist and a mathematician and consequently, brought into his biological studies the viewpoint of the inorganic sciences.

Index

Proceedings of the Iowa Academy of Science

No abstract provided.

Further Observations On The Behavior Of Vanillin Substitution Products: (A) The Perkin Reaction; (B) The Preparation Of Substituted Vanillic Acids, L. Chas. Raiford, Victor S. Webster, Dwight J.. Potter

Proceedings of the Iowa Academy of Science

When the carbonyl group is joined directly to carbon and hydrogen (aldehydic) or to carbon and carbon (ketonic) it reacts with phenylhydrazine to give the corresponding phenylhydrazone. When the radical is joined directly to nitrogen and hydrogen, as in formanilide, the products are aniline and formylphenylhydrazine. Substitution productions of formanilide behave similarly. If the radical is joined directly to nitrogen and nitrogen, as in diphenylurea, the products are aniline and a semicarbazide. The corresponding thiourea behaves similarly, and gives a thiosemicarbazide. If the reaction with the thioureas is carried out in the presence of a desulphurizing agent, guanidine derivatives are …

Organic Matter And The Life Of The Green Plant, Norman Ashwell Clark

Proceedings of the Iowa Academy of Science

Along with the development of the conception of vitamins for animals there was introduced the corresponding idea of the necessity of unknown organic substances for plants. These accessory substances, termed auximones, were claimed to be essential for the growth and development of all chlorophyll producing plants. By the use of Lemna major it was found at Iowa State College that this claim was not valid, and that these plants would grow and reproduce successfully in a medium composed of highly purified inorganic salts. The presence of organic matter, however, stimulated the reproduction, and the effect of organic substances has been …

The Velocites Of Hydrolysis Of The Three Monomethoxy-Diphenyl Ketimines, James B. Culbertson, Amel L. Bresson

Proceedings of the Iowa Academy of Science

The 2- and the 3-methoxy-diphenyl ketimines have been prepared employing the general method of Moureu and Mignonac. The 4-methoxy-diphenyl ketimine had been prepared previously.

Reaction Of Some Carbonyl And Thiocarbonyl Compounds With Phenylhydrazine, L. Chas. Raiford, W. T. Daddow

Proceedings of the Iowa Academy of Science

When the carbonyl group is joined directly to carbon and hydrogen (aldehydic) or to carbon and carbon (ketonic) it reacts with phenylhydrazine to give the corresponding phenylhydrazone. When the radical is joined directly to nitrogen and hydrogen, as in formanilide, the products are aniline and formylphenylhydrazine. Substitution productions of formanilide behave similarly. If the radical is joined directly to nitrogen and nitrogen, as in diphenylurea, the products are aniline and a semicarbazide. The corresponding thiourea behaves similarly, and gives a thiosemicarbazide. If the reaction with the thioureas is carried out in the presence of a desulphurizing agent, guanidine derivatives are …

The Rock Shelters Of Allamakee County, Iowa, A Preliminary Survey, Ellison Orr

Proceedings of the Iowa Academy of Science

Among the rock formations of Allamakee county is one to which the geologists have given the name of Jordan Sandstone. This rock first begins to show above the Mississippi river at McGregor, Iowa. At Waukon Junction, nine miles above, there is a fine exposure from the station up to and above "The Painted Rock" showing its characteristic buttresses, caves, fissures and over-hanging ledges. At New Albin it has risen to more than two hundred feet above the river.

Two New Infusoria (Protozoa) From Iowa, Robert L. King

Proceedings of the Iowa Academy of Science

Test truncated pyriform, widest at the base where it is fixed by a short stalk, truncated at the apical end where there is a definite, free, lip-like border; circular in cross section. Three or four corrugations at the widest part of the base. Body oval or spherical fastened to the base of the test, usually protruding from the test but not completely filling it. Tentacles slightly knobbed, numerous, scattered over the protruding surface of the body. Macronucleus central, oval; micronucleus not observed. One, two or three contractile vacuoles, requiring 12-20 minutes at 22° C. for a complete cycle.

Retrogressive Changes In The Ovaries Of Rana Clamitans Tadpoles Following X-Ray Treatment, William T. Levine

Proceedings of the Iowa Academy of Science

The ovaries of Rana clamitans larvae show marked degenerative changes after x-ray treatment with lethal doses. These animals live from three to four weeks after exposure and death is usually accompanied by characteristic pathological changes in the epidermis and viscera. The ovary becomes smaller and in young animals its further development is arrested. The oogonia are most resistant to x-rays and exhibit very little change but the growing young eggs are completely disintegrated probably by changes in their chemical composition. The larger auxocytes also degenerate by a process of vacuolization and finally appear as cells of a fibrous skeletal structure. …

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

Proceedings of the Iowa Academy of Science

No abstract provided.

Quantitative Analysis Of Lettuce Ash, Louise Wendt, John A. Wilkinson

Proceedings of the Iowa Academy of Science

As early as 1864 Wolff brought out the need for a systematic tabulation of plant ash analyses and in his book published the best data available at that time. He reported CaO, MgO, K₂0, Na₂O, Fe₂O₃ , PO₃ , SO₃ , SiO₂ and Cl. But he gave neither the number of analyses nor the source of the samples. Similar data are given by both Leach and Sherman.

Organomagnesium Compounds Containing Solubilizing Amino Groups, Henry Gilman, Stanton A. Harris, Chuan Liu

Proceedings of the Iowa Academy of Science

There is an uncommon demand, particularly in cancer and related studies, for organomagnesium compounds which contain amino groups to increase the solubility of products and also endow them with certain desirable physiological properties. With this in mind a series of Grignard reagents is being prepared, the members of which contain the -MgX group attached to carbon in a molecule having a basic group like -NR₂ or in a substituted pyridine, quinoline, etc., grouping. Such RMgX compounds are formed from the corresponding RX compounds with somewhat less ease than from RX compounds having no basic grouping; however, they appear to …

Science Bulletin, Vol.3 No.4, December 1930 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

The Nature Of Adaptations, O. R. Clark

Science Bulletin

In the October number of this bulletin, in a discussion of the influence of environment upon the growth and development of plants, the statement was made that, on the whole, plants are quite well adapted to the conditions under which they grow. As to the manner by which this ''fitness” has arisen there are some differences of opinion and, in the opinion of the writer, a great many misunderstandings. This is a question to which no ''cut-and-dried'' answer can be given but to which a fundamental principle of biology may be applied.

Title Page

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Science Bulletin, Vol.3 No.3, November 1930 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Plant Disease, C. W. Lantz

Science Bulletin

Many educated people do not realize that a plant may be diseased as truly as a human being; at least they have little conception of the nature and significance of plant disease. In an agricultural state such as Iowa this is an important question and some time can very profitably be given to the study of plant disease either in the biology course or in the agriculture course.

Textbooks On General Science

Science Bulletin

Many requests have come to us for information concerning elementary and high school science textbooks. The kind most often mentioned have been those on general science. We are therefore printing below a list of such books, with a brief statement of content in each case.

The Effects Of Weight Cutting, H. Earl Rath

Science Bulletin

During the last decade, wrestling has increased rapidly as a high school as well as a college sport. About this time of year in those high schools where wrestling is listed as an interclass or interschool sport, the coach is anxiously looking over the material available and trying to mentally arrange them into groups according to the classes in which they will have to compete.

Question Box, R. W. Getchell, Roy L. Abbott, L. Begeman

Science Bulletin

Will you give suggestions how to organize and conduct a science club?

How may a habitat for frogs, snakes, etc. be made?

What is a Planetarium? Will you describe one?

Carbon Dioxide: Experiments For General Science, O. B. Read

Science Bulletin

It is quite generally thought that an elaborate equipment of test tubes, flasks, beakers, dishes and desks are needed for any experiment involving chemistry. There are, however, many simple and instructive experiments that may be tried with only common household apparatus.

About Static Electricity, L. Begeman

Science Bulletin

Static charges of electricity occur in two forms, viz.: positive charges and negative charges. We now know that a negative charge consists of an aggregate of small particles called electrons and that a positive charge consists of an aggregate of small particles called protons. These electrons and protons may with equal correctness be considered particles of matter or particles of energy.

The Purple Pen, Volume 3, Number 1, November 1930 [Download Entire Issue]

Purple Pen

No abstract provided.

Shell Shocked, Harland Hanson

Purple Pen

No abstract provided.

An Adventure Among The Masterpieces Of Alfred Lord Tennyson, Hazel Robinson

Purple Pen

No abstract provided.

Environment As A Factor In The Growth And Distribution Of Plants, O. R. Clark

Science Bulletin

The form and appearance of plants and the activities which they carry on are due in large part to the inherited characteristics of their ancestors. The influence which heredity exerts should be clearly and forcefully presented to students. At the same time the expression of the hereditary traits may be greatly modified by the conditions under which! the plants grow.