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In Memoriam: Fred C. Werkenthin; Chalmers Colin Norwood, John N. Martin, Ben Hur Wilson

Proceedings of the Iowa Academy of Science

No abstract provided.

Proceedings Of The Thirty-Sixth Annual Session Of The Iowa Academy Of Science, Drake University, Des Moines, April 28 And 29, 1922: Minutes Of The Meeting; Staff & Committee Reports

Proceedings of the Iowa Academy of Science

No abstract provided.

A Chemical Classification Of The Activities Of Soil Microorganisms, Paul Emerson

Proceedings of the Iowa Academy of Science

At the present time it may be said that the process of decomposition with its resultant complex chemical changes taking place in the soil is controlled primarily by the activities of micro-organisms and that Soil Fertility is mainly dependent upon these microscopic forms.

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

Proceedings of the Iowa Academy of Science

No abstract provided.

Iowa Microlepidoptera, A. W. Lindsey

Proceedings of the Iowa Academy of Science

After writing my last paper on the Lepidoptera of Iowa, viz., "Some Iowa Records of Lepidoptera," I still had in my possession a considerable number of specimens of Tineoidea and all of the Phycitinae which I had taken in the state. I attempted to work up this material during my last few months as curator of the Barnes collection at Decatur, Illinois, and succeeded with most of the Tineoidea. The subfamily Phycitinae of the Pyralidae is in such great need of careful revision that I feel safer in omitting it entirely at present, though I have identified a few species …

Brood A Of The May Beetles Extends Its Range In Iowa, H. E. Jaques

Proceedings of the Iowa Academy of Science

Among the well-known insect pests with which the farmer must contend are the May beetles which in the larva stage, as white grubs, do heavy damage to the grasses, corn, potatoes, strawberries and garden crops. There are about one hundred species of May beetles known to occur in the United States all of which belong to the genus Phyllophaga. Forbes in examining 114,493 May beetles in Illinois found 34 species, but less than half of these were sufficiently abundant to be of serious economic importance.

A Study Of The White Marked Tussock Moth, Susannah Poulter

Proceedings of the Iowa Academy of Science

Early in the winter of 1921-22 it was observed that egg masses of the white marked tussock moth, Hemerocampa leucostigma Smith and Abbot were unusually abundant. Taking advantage of this opportunity it was planned to make a careful study of the life history of that interesting insect. This insect is of considerable economic importance in that the larvae when abundant defoliate trees of various species.

The Founders Of The Art Of Plant Breeding, Fred C. Werkenthin

Proceedings of the Iowa Academy of Science

The paper by Prof. Werkenthin on History of Plant Breeding was one of the assigned topics in the course given at Iowa State College on the History of Botany. The subject matter is so admirably treated that it has seemed wise to publish this as a posthumous paper. It was the last paper prepared by him, finished only a few weeks before he was taken sick.

A Comparative Study Of The Red-Seeded And Common Dandelion, June Berry

Proceedings of the Iowa Academy of Science

To the casual observer the dandelions which prove so serious a pest in lawns and elsewhere, appear to be of only one species. Upon closer investigation, it is found that there are two common species, the Common Dandelion, Taraxacum taraxacum (L) and the Red-seeded Dandelion, Taraxacum erythrospermum (Andrz). These two species are the most easily distinguished by their seeds which are an olive brown and dark red color respectively.

Studies Of Yeast V - Is Bios A Single Substance, Ellis I. Fulmer, V. E. Nelson

Proceedings of the Iowa Academy of Science

In previous communication (Journal of Biological Chemistry, March, 1922) Fulmer and Nelson showed that the water extract of alfalfa is much richer in the yeast growth stimulant, Bois, than is the 95 per cent alcoholic extract of the same material. In the work here described two extracts were prepared as follows from alfalfa which had been previously extracted with ether. Extract A was an extract by long extraction with absolute alcohol. Extract B was an extract prepared by long extraction of the absolute-alcohol-extracted material with water. Both extracts showed optimum concentrations for maximum stimulation and were about equally potent. Combinations …

Methods Of Teaching Parasitology, Herbert R. Werner

Proceedings of the Iowa Academy of Science

The fact that animal parasites are important as disease producing agents has been known for a great many years. Thought, consideration, study, and emphasis on the question of parasitism have come in waves; at times it was looked upon as one of the most important factors to be dealt with, while at other times or periods it has received almost no attention and parasites have been looked upon as more or less unimportant as disease producing agents. But the necessity for the protection of our livestock from disease has grown, being governed largely by the supply and demand, together with …

1921 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.

Notes On The Mammals Observed In Marshall County, Iowa, Ira N. Gabrielson

Proceedings of the Iowa Academy of Science

Few specific locality records for mammals in central Iowa have ever been published. The following brief notes, therefore, have been prepared for the purpose of making available for future workers on Iowan mammalogy the information I am able to give. This list is not complete but comprises only such notes and specimens as came to my hands in one way or another during three years' residence.

College Catalog And Circular 1921, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

Calendar for 1921-1922 ... 5
Officers of Administration and Instruction ... 6
General Information ... 32
Residence, Student Health, Assembly ... 35
Expenses and Fees ... 36
Free Scholarships ... 38
Extension Service ... 38
College Organizations ... 39
Faculty Organizations ... 39
Training in Actual Teaching ... 40
Public Lectures and Entertainments ... 40
Boarding and Lodging ... 40
Employment of Students ... 42
Twelve Weeks Normal Training ... 42
School Credits in Lieu of Certificate Examinations ... 42
Examinations for Teachers Certificates ... 42
Department Certificates ... 42
Bureau of Recommendations ... 42
Degree Curriculums …

Bird Banding And Incidental Studies, Dayton Stoner

Proceedings of the Iowa Academy of Science

While the phenomena connected with bird migration have been studied for more than two thousand years much is yet to be learned of this most interesting and still more or less obscure characteristic of our "feathered bipeds." In attempting to throw some light upon their movements new methods have been devised and, in a degree, perfected. Until recently it has been the aim of ornithologists to study the migratory habits of species or even of larger zoological groups; but of late an effort has been made to study individuals of a species by marking the birds in some permanent manner …

The Genus Ceanothus L. In Iowa, B. Shimek

Proceedings of the Iowa Academy of Science

The low shrubs known as New Jersey Tea, belonging to the Genus Ceanothus, were once very abundant throughout Iowa, occurring chiefly on the prairies, and sometimes in dry, open woods and along the borders of drier thickets. On account of their long, tough roots they interfered with the breaking of the prairie, and the commoner species, C. americanus, known as "shoestring" or "red-root," was by no means popular with the pioneers. Perhaps for this reason, and because they were so common, these attractive shrubs were seldom cultivated in this state.

College Catalog And Circular 1920, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

Calendar for 1920-1921 ... 3
Officers of Administration and Instruction ... 4
General Information ... 30
Residence, Student Health, Assembly ... 34
Expenses and Fees ... 35
Free Scholarships ... 37
Extension Service ... 37
Acceptance of Credits from Other Institutions ... 37
College Organizations ... 38
Faculty Organizations ... 39
Training in Actual Teaching ... 39
Public Lectures and Entertainments ... 39
Boarding and Lodging ... 40
Employment of Students ... 41
Twelve Weeks Normal Training ... 41
School Credits in Lieu of Certificate Examinations ... 41
Examinations for Teachers Certificates ... 42
Department Certificates ... …

The Major Vegetation Of Lake Okoboji, Robert B. Wylie

Proceedings of the Iowa Academy of Science

The major vegetation of Lake Okoboji consists chiefly of submersed seed plants. The algae are always in evidence and play an important part in the life of the lake since they are used as food by many lower animals, but with the exception of Chara they are seldom conspicuous and never large.

A Study Of Sociality In The Madreporaria, Gertrude Van Wagenen, H. J. Wehman

Proceedings of the Iowa Academy of Science

The type of sociality found in the Madreporaria is necessarily primitive. While we were making this study two criteria of sociality have been adopted and applied: first, the proximity of one corallite to another; second, organic communication between associated polyps and corallites. As the two criteria indicate, sociality is examined from the standpoint of morphology of hard parts. This is necessary because of the extent of the field covered, the absence of live specimens, and the inclusion of fossils.

1920 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.

Table Of Contents

Proceedings of the Iowa Academy of Science

No abstract provided.

The Address Of The President - The Taxonomic Unit, T. C. Stephens

Proceedings of the Iowa Academy of Science

The retiring president is expected to follow the custom of addressing the Academy upon some subject of general interest. Fortunately, custom does not require that such an address shall embody one's own research or investigation; but it may consist of a survey, or of reflections of a general nature. It so happens that certain fields in which I have been somewhat interested have brought me to a study of the problem of the taxonomic unit in biology.

Recent Army Worm And Variegated Cutworm Outbreaks In Iowa, H. E. Jaques

Proceedings of the Iowa Academy of Science

The 1919 and 1920 outbreaks of Army worms within our state were by no means new experiences for Iowa. Previous heavy losses from this pest, however, date back so many years that the younger generation of farmers knew them only by tradition. With older men, the memories of their experiences seem to have been somewhat confused so that many stories were related that were but in part in keeping with the history and habits of the Army worm. With all classes there seemed to be an unwarranted fear of the insect and exaggerated ideas of its ability to travel, reproduce …

Cladocera Of The Okoboji Region, Frank A. Stromsten

Proceedings of the Iowa Academy of Science

The following list of Cladocera is a continuation of the list published in the Proceedings of the Iowa Academy of Science for 1917. It represents the species collected during the summer of 1919, from June 24 to September 1.

Copepoda Of The Okoboji Region, Frank A. Stromsten

Proceedings of the Iowa Academy of Science

BRANCH= ARTHROPODA, Class: Crustacea, SUBCLASS: ENTOMOSTRACA, Order: COPEPODA, Suborder: Eucopepoda, Group: GNATHOSTOMA, FAMlLY:CENTROPAGIDAE, Genus Diaptomus

Susceptible And Resistant Phases Of The Dividing Sea-Urchin Egg When Subjected To Various Concentrations Of Lipoid-Soluble Substances, Especially The Higher Alcohols, Francis Marsh Baldwin

Proceedings of the Iowa Academy of Science

That dividing Arbacia eggs show periods of varying susceptibility and resistance when exposed to chemical substances and to various physical conditions has been proved by numerous investigations. When eggs from a single fertilized lot were placed at regular successive intervals after fertilization in cyanide containing sea-water (m/100 to m/200), Lyon found that they were highly resistant to poisoning fifteen or twenty minutes after fertilization, while eggs exposed to the same solution at the time of cytoplasmic division were promptly killed. Later, after the first division had been completed, the resistance to poisoning again returned, followed by a second susceptible period …

The Relative Position Of The Maxima Contractions Of The Amphibian Muscle When Subjected To Various Ranges In Temperature, Ralph L. Parker

Proceedings of the Iowa Academy of Science

In the regular laboratory work in muscle-nerve physiology, it was noted that records obtained by subjecting frog muscles to various ranges of temperature did not exactly agree as to positions of maxima contractions with statements found in the texts, especially that of Howell. At the suggestion of Dr. F. M. Baldwin a fairly large series of experiments has been carried out to determine the relative positions of maxima contractions of the gastrocnemius muscle of the frog under varying temperature conditions, and to compare the results thus obtained with those of other investigators.

A Study Of The Phylogeny Of The Anteoninae, F. A. Fenton

Proceedings of the Iowa Academy of Science

A study of the biology of insect parasites and their relationships with that of their hosts offers a most attractive and productive field for research, and as yet, comparatively speaking, but little has been done in this field. This is particularly true with the Hymenoptera, and the writer has been interested in working out the biology of the Anteoninae, one of the parasitic groups of this order. These insects are parasitic on three families of the Homoptera, namely, the Cicadellidae, and Fulgoridae, commonly known as leafhoppers, and the Membracidae or treehoppers.

A Biological Reconnaissance Of The Okefinokee Swamp In Georgia: The Fishes, E. L. Palmer, A. H. Wright

Proceedings of the Iowa Academy of Science

From the earliest days of North American ichthyology to the present the fishes of South Carolina and North Carolina have received particular attention and in more recent times according to one author Florida fishes have attracted more general interest than those of any other state in the Union. Georgia forms by contrast have received scant attention and often have come into ichthyologic literature by inclusion in the range of northern species known from Florida or of southern species known from South Carolina and northward.

An Intensive Ornithological Survey Of A Typical Square Mile Of Cultivated Prairie, Arthur R. Abel

Proceedings of the Iowa Academy of Science

The present paper is a report on an intensive ornithological survey of a typical section of prairie farm land in northwestern Iowa. In making the survey several objects were in view. Besides merely making a census, it was hoped that some light might be thrown on the relation of birds to various crops, the effect of constant tillage on bird life, etc. It was thought that the exact data accumulated now would furnish a basis for comparison at a future time. With some such means of measuring the actual increase or decrease of the bird population, we will be in …