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Notes On Two Strawberry Slugs, Empria Fragarae Rohwer, Empria Maculata Norton, R. L. Webster

Proceedings of the Iowa Academy of Science

The literature of economic entomology has many references to slugs that feed on strawberry foliage, discussed for the most part under the name of Harpiphoriis maculatus Norton, but also as Monostegia ignota Norton. That there were two common species of these slugs affecting strawberry plants was shown by the work of F. W. Mally (1889). During the five years 1910- 1914 inclusive, the writer has studied both these species in the insectary at Ames. The present paper is based on a study of the literature, as well as from additional notes of the writer. S. A. Rohwer, of the U. …

Distributional Notes On Some Iowa Pentatomoidea, Dayton Stoner

Proceedings of the Iowa Academy of Science

During the past two summers the writer has been enabled, through the co-operation of the Iowa Geological Survey, to visit various parts of the state for purposes of collecting both mammals and insects. In the course of this collecting, some species of Pentatomoidea not before recorded from Iowa have been secured and, in addition, distributional records of a number of species have been added. Considerable collecting has been done in the vicinity of Iowa City also and this has resulted in some new additions to and increased the known distribution of the state fauna in this group.

The Behavior Of Legume Bacteria In Acid And Alkaline Media, Raymond C. Salter

Proceedings of the Iowa Academy of Science

Several investigators have noted a very marked difference in the resistance of various legumes to soil acidity. Vast areas of cultivated land in the United States show an acid reaction, and as lime is expensive in some localities it has been suggested that much can be saved by the choice of acid tolerant crops. Red clover, crimson clover, soy bean, cowpea, hairy vetch, lupine and serradella have been reported as acid tolerant, while on the other hand, alfalfa, one of our most useful forage crops, is found to be very sensitive to acid.

How A Tree Grows, Fred Berninghausen

Proceedings of the Iowa Academy of Science

Professor Ebermeier of Munich, Germany says: "When the leaves take carbonic acid from the air they break it up and force its carbon into new chemical compounds which are then stored away as new material in the tree. The forest is the most highly organized portion of the vegetable kingdom." No man can really know the forest without feeling the gentle influence of one of the kindest and strongest parts of nature. It is the most helpful friend of man.

A Handy Device For Staining Slides, E. Laurence Palmer

Proceedings of the Iowa Academy of Science

The simple staining apparatus illustrated in the accompanying diagram was devised to take the place of the more expensive staining jars sold by most of the scientific supply houses. Besides the cheapness of the outfit, which fits into any tumbler, there is the added advantage that all of the slides being stained may be removed from the jar at once and may be rinsed while still in the frame. Fourteen slides may be inserted into the frame at one time, which is four more than the average staining jar holds.

Pioneer Plants On A New Levee - Ii, Frank E. A. Thone

Proceedings of the Iowa Academy of Science

A year ago the writer presented before the meeting of the Academy at Iowa City a paper under the above title describing the vegetation appearing during the first growing season on a newly built embankment in Des Moines. It was his intention to make this the first of a series of studies following the development of the flora on this area until a permanent balance of power had been established.

Notes On The Weeds Of California, L. H. Pammel

Proceedings of the Iowa Academy of Science

During the month of August, 1915, the writer and Mrs. Pammel spent a month visiting California. Our journey took us over the Western Pacific railroad from Salt Lake City. This railway passes over the Sierra divide and down the Feather River canyon, down the Yuba and Sacramento flood plains, thence into San Francisco. At several points along the line stops were made and some collecting was done. From San Francisco we went over the Southern Pacific to Big Trees, Santa Cruz, Monterey, Santa Barbara and Los Angeles —from the latter point over the Santa Fe to San Diego and return …

Notes On Some North American Conifers Based On Leaf Characters, L. W. Durrell

Proceedings of the Iowa Academy of Science

Leaf characters, unlike stem characters, are as a rule subject to such variations that they form an unreliable basis of comparison between plants. Conifer leaves on the contrary, because of their simplicity as compared with other leaves, show a large degree of uniformity, particularly in those characters seen in cross section.

The Formalin Treatment For Controlling Oat Smut, John A. Krall

Proceedings of the Iowa Academy of Science

Five million dollars is a conservative estimate of the annual loss incurred by the oat smut disease in Iowa. That this loss can be controlled is indicated by the following statements from farmers over the state of Iowa.

Late Potato Blight Epidemics In Iowa As Correlated With Climatic Conditions, A. T. Erwin

Proceedings of the Iowa Academy of Science

At least three pronounced outbreaks of the late blight of the potato, Phytophthora infestans, have occurred in Iowa within the past forty-five years. These were in 1885, 1903, and 1915. The northern limits of the region generally designated as the corn-belt seems to represent in a general way the southern limits of this disease under normal climatic conditions. This is indicated by the fact of its frequent occurrence in the region just north of us.

The White Waterlily Of Iowa, Henry S. Conard

Proceedings of the Iowa Academy of Science

Most of the known species of waterlily (Nymphaea Sm.) are extremely variable. The student feels obliged to recognize certain extreme forms as species. These are often restricted geographically. But where their habitats are connected by continuous land areas, the intermediate country is usually populated by a series of waterlilies which grade insensibly from one extreme to the other. The commoner white waterlilies of North America illustrate these conditions.

Fall Term Commencement [Program], December 7, 1915, 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.

Quarterly News Letter To The Alumni, December 1, 1915, Iowa State Teachers College

Quarterly News Letter to the Alumni

A quarterly publication to keep graduates of the Iowa State Teachers College informed on the happenings on campus and of fellow alumni.

Quarterly News Letter To The Alumni, September 1, 1915, Iowa State Teachers College

Quarterly News Letter to the Alumni

A quarterly publication to keep graduates of the Iowa State Teachers College informed on the happenings on campus and of fellow alumni.

Summer Term Commencement [Program], July 13, 1915 And August 24, 1915, 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.

Courses Of Study And Program Of Recitations, 1915-1916, Iowa State Teachers College

UNI Schedule of Classes

A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the Iowa State Teachers College.

Quarterly News Letter To The Alumni, July 1, 1915, Iowa State Teachers College

Quarterly News Letter to the Alumni

A quarterly publication to keep graduates of the Iowa State Teachers College informed on the happenings on campus and of fellow alumni.

Spring Term Commencement [Program], May 25, 1915, 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.

College Catalog And Circular 1915, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents:

Calendar for 1915-1916 ... 6
Officers of Administration ... 7
Officers of Instruction ... 7
Faculty Committees 1915-1916 ... 16
Plan of Organization ... 19
General Regulations ... 19
Faculty Regulations ... 21
Order and Deportment ... 21
Credits and Scheduling ... 21
Extension Service ... 22
Exchange of Students ... 23
Expenses and Fees ... 23
College Organizations ... 25
Training in Actual Teaching ... 26
Public Lectures and Entertainments ... 26
Boarding and Lodging ... 28
Requirements for Admission ... 30
The College Degree Courses ... 32
Department Courses ... 40
The Diploma Courses ... …

Quarterly News Letter To Alumni, April 1, 1915, Iowa State Teachers College

Quarterly News Letter to the Alumni

A quarterly publication to keep graduates of the Iowa State Teachers College informed on the happenings on campus and of fellow alumni.

Winter Term Commencement [Program], March 2, 1915, 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.

Summer Term, Nineteenth Annual Session, 1915, Iowa State Teachers College

UNI Schedule of Classes

A listing and schedule of the courses being taught as well as policies and procedures concerning attending classes at the Iowa State Teachers College.

Quarterly News Letter To Alumni, January 21, 1915, Iowa State Teachers College

Quarterly News Letter to the Alumni

A quarterly publication to keep graduates of the Iowa State Teachers College informed on the happenings on campus and of fellow alumni.

An Attempt To Detect A Change In The Heat Conductivity Of A Selenium Crystal With A Change In The Illumination, L. P. Sieg

Proceedings of the Iowa Academy of Science

Modern electron theories indicate that the electrical and thermal conductivities of good conductors should stand in very close agreement with each other. One of the first theoretical developments was that of Drude. While perhaps, it will not be necessary to rewrite his formula here, we can at least state that he determined on purely theoretical grounds that the ratio of the thermal to the electrical conductivities for good conductors should he a function only of the absolute temperature. This theoretical formula has had excellent verification in the work of Jaeger and Disselhorst, who worked with most of the common metals. …

Notes On Iowa Pentatomoidea, Dayton Stoner

Proceedings of the Iowa Academy of Science

The average person usually refers to almost any· kind of insect as a "bug" but, employing the latter term in its proper sense, it represents the common name of an insect which belongs to one of the largest and best represented groups in North America. All bugs belong to the order Hemiptera which name is derived from the character of the fore wings though wings are not present in all members of the order.

Some Unique Niagaran Cephalopods, A. O. Thomas

Proceedings of the Iowa Academy of Science

Among the paleontological collections at the State University of Iowa are some unique cephalopod remains. It is the purpose of this paper to call attention to a few of them and it is hoped that at some later time the rich Niagaran fauna of which these are a part shall receive more extensive treatment.

The Effect Of Change Of Lamp Voltage On Vision, Wm. Kunerth

Proceedings of the Iowa Academy of Science

If must be apparent to anyone who has tried to read or study by the light of an incandescent lamp that there is occasionally such a great change in the impressed voltage as to be decidedly objectionable. These changes may be due to a turning on or off of a great number of lamps at the same instant, or to the closing or opening of a circuit containing a relatively big power consuming agent.

1915 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.

Title Page - Letter Of Transmittal, James H. Lees

Proceedings of the Iowa Academy of Science

No abstract provided.

A Comparative Study Of The Weeds Of Central Iowa, Northern Minnesota And Wisconsin, L. H. Pammel

Proceedings of the Iowa Academy of Science

During a short trip made by the writer in northern Minnesota from Cass Lake to Duluth in Minnesota, St. Croix, Wisconsin, and Taylors Falls, Minnesota, some observations were· made on the introduced plants. The route covered was over the Northern Pacific from Minneapolis to Walker and Cass Lake; from Cass Lake over the Great Northern Railway to Duluth, and via the Northern Pacific to St. Croix Falls, Wisconsin.