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The Effect Of Sodium Nitrate And Water Applications To Apple Trees Suffering From Drouth On Some Chemical Constituents Of The Fruit, H. H. Plagge

Proceedings of the Iowa Academy of Science

Storage tests on apples indicated that orchard applications of nitrate of soda had an unfavorable influence on storage capacity. As this effect appeared to be greatly restrained by drouth in 1930, experiments were carried on in 1931 to determine specifically the effect of differential treatments of nitrate of soda and water to trees suffering from dry weather.

Self-Parasitism In Achlya Racemosa Hildb., Myrle M. Burk

Proceedings of the Iowa Academy of Science

In cultures of Achlya racemosa Hildb. oospores in the oogonium were completely absorbed by hyphae arising from antheridia or from the wall dividing the oogonium and stipe.

A Comparison Of Glass And Quinhydrone Electrodes For Determining The Ph Of Some Iowa Soils, Harold L. Dean, R. H. Walker

Proceedings of the Iowa Academy of Science

A comparison was made of glass and quinhydrone electrodes for determining the pH of some Iowa soils. Particular attention was given to the "QH error" and the "QH electrode error," and also to any changes in the hydrogen-ion concentration of the soil as it is permitted to stand in contact with water. The modified bulb, silver-silver chloride type of glass electrode and the ordinary type of platinum electrode with quinhydrone were employed in making the determinations.

Some Laboratory Experiments That Can Be Better Performed In The Library, C. J. Lapp

Proceedings of the Iowa Academy of Science

Using matched groups of students, experiments have been performed on the relative learning over specific skills in physics of groups working in a library vs. a similar group working in the laboratory. Several distinct cases stand out in which the library method appears to be the more effective.

A Revised List Of The Orthoptera Of Iowa, Herbert Knutson, H. E. Jaques

Proceedings of the Iowa Academy of Science

The first list of Iowa Orthoptera was entitled "A Preliminary Catalogue of the Orthoptera of Iowa." This was published by C. E. Bessey in the Seventh Biennial Report of the Iowa State College in 1877. The list included about forty species.

Modifications Induced In The Plumage Of Passer Domesticus (Linnaeus) By Experimental Hyperthyroidism, Dorothea Starbuck Miller

Proceedings of the Iowa Academy of Science

Experimental hyperthyroidism was induced in normal and castrated male and female sparrows by injection of crystalline thyroxin into the breast muscle. Definite color modifications occur in the regenerating feathers of various regions, particularly in the chestnut brown contour feathers and the black breast feathers of the male. The color of the modified male plumage resembles the female type more than that of the normal male, although the plumage of the female also shows pigment changes. It is possible that the thyroid may be involved in the control of sexual dimorphism in feather pattern.

College Catalog 1934-1935, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

College Calendar for the Year 1935-36 ... 5
State Board of Education ... 6
Officers of Administration ... 7
Officers of Instruction .... ... 8
Other Officers and Assistants ... 16
Faculty Committees ... 19
General Information
Historical Sketch ... 22
Buildings and Grounds ... 22
Enrollment and Registration ... 25
Fees ... 25
The College Dormitories ... 27
Accredited Rooming Houses ... 27
Employment of Students ... 28
Student Organizations ... 28
Control of Extra-Curricular Activities ... 29
Placement Bureau ... 29
General Regulations
Entrance Requirements ... 31
Admission with Advanced Standing ... 32
Advisers and …

The General Morphology Of The Elasmobranch Hypophysis, H. W. Norris, Jack Maxfield

Proceedings of the Iowa Academy of Science

The terms hypophysis and pituitary are used loosely and interchangeably by many if not most writers on endocrine organs. By "pituitary" the writers of this paper understand an assemblage of two diverse elements: an epithelial hypophysis derived from the buccal ectoderm of the embryo and a pars nervosa originating from the infundibulum of the brain. The junction and fusion of these two parts form the pituitary proper. It is with such an interpretation that we shall use the terms hypophysis and pituitary.

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

Proceedings of the Iowa Academy of Science

No abstract provided.

Table Of Contents

Proceedings of the Iowa Academy of Science

No abstract provided.

In Memoriam: Wesley Greene; Clyde E. Ehinger; Joseph Edward Guthrie, A. T. Erwin, Frank C. Pellett

Proceedings of the Iowa Academy of Science

No abstract provided.

Legal Relationships Of Trees And Shrubs In Iowa, H. D. Harrington

Proceedings of the Iowa Academy of Science

The purpose of this paper is to review in a general way the laws that exist in this state affecting woody plants and to give some suggestions of how these laws work out in certain definite cases. A word of explanation seems in order as to why one with no particular legal training should attempt a subject of this kind.

Host Plants Of Cuscuta Glomerata, H. L. Dean

Proceedings of the Iowa Academy of Science

In a previous paper (1934) the writer listed eighty-three species of host plants of Cuscuta Gronovii Willd. for West Virginia. Later six additional hosts for this species were added, as a result of greenhouse experiments at the State University of Iowa, making a total of eighty-nine host plants observed by the writer for this species.

The Distribution And Life History Of The Trillium Nivale Riddell, John N. Martin

Proceedings of the Iowa Academy of Science

The Trillium nivale, commonly called the Snow Trillium, is the earliest of the vernal wild flowers in Iowa and probably throughout its range (Fig. 1). Records kept over a period of years at the Ledges State Park in Boone County, Iowa, show that the Snow Trillium begins flowering in that vicinity between the 10th and 25th of March. At its northernmost limit it is in full flower during April. Its ability to develop and flower under low temperatures is one of its remarkable features. The ground is still partly frozen or barely thawed about its corm when the Snow Trillium …

A Photoelectric Colorimeter: Its Application In The Measurement Of The Concentration Of Colored Substances In Solution, F. M. Turrell, Louis Waldbauer

Proceedings of the Iowa Academy of Science

The concentration of plant substances such as the chlorophylls and carotenes can most readily be quantitatively measured by colorimetric methods. Colorimetry also offers a rapid method for the quantitative determination of organic substances such as sugars, oxidases, and inorganic ions as magnesium, iron and phosphates, in which colors can be developed when in combination with certain other ions in solution. The personal equation in such measurements has long been known to contribute a source of error where such methods have been used. An extended bibliography of which part 2 of this paper is composed, has several references which show that …

Additions To The Lichen Flora Of Emmet County, B. O. Wolden

Proceedings of the Iowa Academy of Science

Since the publication of a preliminary list of the mosses and lichens of Emmet County in 1919, no special effort was made to add to the list of lichens, but a few additional species were picked up incidentally while collecting other plants and those are recorded here. Most of these additions were found in 1927-28. The original list contained 49 species and varieties to which have since been added 18, making a total of 67.

Structure Of The Libriform Fibers In The Roots And Crowns Of Alfalfa And Sweet Clover, John N. Martin

Proceedings of the Iowa Academy of Science

In addition to the middle lamella there are two layers, primary and secondary, in the walls of the libriform fibers. The primary layer is composed of strands of fibrils helically oriented around the fiber almost at a right angle to the fiber axis. The secondary layer is composed of a number of lamellae each of which is composed of fibrils that run parallel to the axis of the fiber.

The Germination Of Sweet Clover And Alfalfa Seed In Relation To Various Conditions Of Temperature And Moisture, John N. Martin

Proceedings of the Iowa Academy of Science

Seeds have been stored in constant low temperatures, constant room temperatures, and in fluctuating temperatures, both in dry and wet, and alternating dry and wet conditions. The experiments which have now run a number of years show that moisture is not necessary for hard seeds to become permeable. The change from hardness to a condition of permeability depends upon the fluctuation of temperature over a relatively long period of time. Seeds stored where the temperature fluctuates as in unheated sheds tend to become permeable each spring and if stored over a period of years under such conditions probably lose much …

Nutritional Physiology Of Certain Dioecious Plants, W. F. Loehwing, L. C. Bauguess

Proceedings of the Iowa Academy of Science

Further study has been made of the metabolic expression of sex in shoots of typical dioecious hemp plants. Results obtained show significant differences in metabolism of corresponding shoot regions of the two sexes before as well as after the development of sexual dimorphism.

Life History Of Two Plastic Species Of Polygonum; Their Economic Role, Ada Hayden

Proceedings of the Iowa Academy of Science

The fruits of Polygonum coccineum Muhl. and P. natans A. Eaton constitute an important source of food for waterfowl. Both species, particularly P. coccineum, commonly invade crops. Both are widely distributed in Iowa, and have been observed in the field in several forms and varieties: P. natans forma genuinum (A. Eaton) Stanford, and forma Hartwrightii (Gray) Stanford; P. Coccineum forma terrestrae (Willd.) Stanford, forma natans (Wiegand) Stanford, and var. pratincola (Greene) Stanford. The several forms of either species may occur on the single rootstock growing in dry ground bordering ponds. Each species has been converted from terrestrial to aquatic form …

Fungi Associated With Tree Cankers In Iowa: Ii. Diaporthe, Apioporthe, Pseudovalsa And Their Related Conidial Stages, Joseph C. Gilman, G. L. Mcnew

Proceedings of the Iowa Academy of Science

Twelve species of Diaporthe are reported for the state. Of these twelve, eight are associated with tree cankers, three are on shrubs and one is on an herbaceous host, Asclepias. Of the related genera, Apioporthe and Pseudovalsa are represented with one and two species respectively. Unconnected species of Phomopsis are recorded on Acer, Malus, Salix, Pinus, Juniperus, Cosmos, Plantago and Solanum.

Alegria - A Popping Seed Used In Mexico As A Substitute For Pop Corn, A. T. Erwin

Proceedings of the Iowa Academy of Science

Amaranthus caudatus L., var. leucospermus Th. Observations of the author regarding Alegria, which is used as a substitute for popcorn in the maize region of southern Mexico. Taxonomic characters of plant, popping quality of species of Amaranthus used for this purpose and character of endosperm.

Spores Of The Genus Selaginella In The United States, Roger M. Reeve

Proceedings of the Iowa Academy of Science

Micro- and megaspores of the genus Selaginella were studied. These were found to carry diagnostic characters which can be used as an aid in determining the taxonomic relationships and identification of the species. Fossil Selaginella spores from Pleistocene deposits have been identified.

The Relative Solubility Of Soil Phosphorus In Different Solvents, H. C. Millar, F. B. Smith, P. E. Brown

Proceedings of the Iowa Academy of Science

Various investigators have shown that carbon dioxide is important in the soil in making the plant food elements available. As a result attempts have been made to use solvents which are similar to carbon dioxide in their solubility effects on soil phosphorus. In many cases, the available phosphorus as measured by these solvents has correlated rather well with crop responses to phosphate fertilizer in the field, but the correlation is not perfect in all soils.

Effect Of Fluorides On Some Organic Constituents Of Blood And Physical Measurements Of Bone, D. A. Greenwood, C. A. Kempf, V. E. Nelson

Proceedings of the Iowa Academy of Science

The effects of excessive amounts of fluorine on the animal organism have attracted the attention of a large number of investigators recently. This interest in fluorine is associated with the fact that mottled enamel has been correlated with the presence of excessive amounts of fluorides in drinking water and, furthermore, by the fact that certain phosphatic mineral supplements are known to contain fluorine. The authors have been interested in the fluorine problem, since the discovery by Ostrem, Nelson, Greenwood, and Wilhelm (1) of mottled enamel in Iowa, due to the presence of excessive fluorides in the drinking waters in certain …

The Reaction Of Potassium Amide In Liquid Ammonia With Diarylbromethenes, George H. Coleman, William H. Host

Proceedings of the Iowa Academy of Science

The behavior of certain diarylchloroethenes with potassium amide in liquid ammonia has been reported previously. A rapid reaction occurs and the ethenes are changed with the loss of hydrochloric acid to tolanes. Thus 1, 1-di-p-tolyl-2-chloroethene forms p. p'-dimethyltolane. A series of such para substituted compounds was studied and as anticipated only symmetrical tolanes were obtained.

Hydroxyfurans And Their Biological Significance, W. F. Hoehn, C. H. Werkman, H. Gilman

Proceedings of the Iowa Academy of Science

Hydroxyfurans, particularly the mono- and di-β-substituted types (prepared from furans and by ring closure procedures) have been examined biologically, particularly for their growth stimulation effects on bacteria, yeasts and various higher plants. A discussion is included of the synthetic procedures and the proof of structure of the variously substituted hydroxyfurans.

The Hydrolysis Of Silk Fibroin By Steam, Eunice Walde, Rachel Edgar

Proceedings of the Iowa Academy of Science

Although steam is used in many of the processes of silk fabrication as well as in maintenance, the literature records nothing of the hydrolytic effects of steam on this protein.

Oxidation Of Pyrazolines Obtained From Unsymmetrical Dibenzalacetones, Ralph H. Manley, L. Chas. Raiford

Proceedings of the Iowa Academy of Science

When the hydrazone of an unsymmetrical dibenzalacetone rearranges to the isomeric pyrazoline two products are theoretically possible. The identification of these products is somewhat difficult. In previous work in this Laboratory¹ the pyrazolines have been oxidized by aqueous alkaline permanganate solution and the substituted pyrazole and benzoic acids, respectively, separated and identified. The yields are small due to the fact that the permanganate is known to degrade some members of both these groups further.² In the present work the ketones used contained substituted vanillal residues, and the oxidation was done in pyridine solution. The yields were much higher …

Heavy Water Obtained By The Combustion Of Dried Biological Specimens, H. L. Keil, A. W. Ralston, M. T. Kelley, W. E. Catlin, W. H. Jennings, J. Straley, H. Gilman

Proceedings of the Iowa Academy of Science

Dry, finely divided plant and animal tissues were oxidized by passage over hot copper oxide; the aqueous condensates were first distilled from potassium permanganate and then alone. If necessary, oxidation and distillation were repeated until there was no significant change in density. Densities were determined by a modification of the submerged magnetic float procedure, and the accuracy was one part per million. The specimens examined were practically all of the chief organs of cattle; yeasts; dairy products; and some parts of plants like corn and melons. The study is being extended to other biological specimens, normal and pathological.