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Springtails As Economic Insects, Harlow B. Mills

Proceedings of the Iowa Academy of Science

Springtails, or Collembola, are minute soft bodied insects which, although the number of species is small, sometimes attract attention by the numbers in which, under favorable conditions, they appear. They have been somewhat overlooked by workers in the different phases of biology; no doubt a natural consequence of their small size (1-4 mm.), and inconspicuous, retiring habits. They generally live in organic debris, or wherever there is sufficient moisture to support their existence. But for a part of one family, in which there is a poorly developed tracheal system, the respiration in this order is cutaneous and the skin must …

Index

Proceedings of the Iowa Academy of Science

No abstract provided.

Biology In High Schools Of Iowa, George O. Hendrickson

Proceedings of the Iowa Academy of Science

Within recent years Zoology and Botany as separate subjects have nearly disappeared from the curricula of the public High Schools of Iowa. A course known as Biology has taken their places. In an attempt to learn the nature of High School Biology the author secured sample textbooks, laboratory manuals and figures concerning adoptions from the leading publishers of school books.

1930 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.

Astronomy, E. J. Cable

Science Bulletin

In the field of general science, astronomy offers projects for practical as well as very useful knowledge. One of the greatest values is its appeal to the intellect. Astronomy attempts to unravel the secrets of nature, not only on our planet, but also in the vastness of space around us that is within reach of man's powerful instruments. It acquaints man with what is going on around him as well as with what is happening in regions far removed from everyday experiences and personal contacts. Astronomy tries to make man feel "comfortable" and at "home" in his universe.

Further Studies On The Nitrate Assimilating Power Of Soils, Ray A. Pendleton, Frederick B. Smith

Proceedings of the Iowa Academy of Science

In a paper read at the meeting last year it was pointed out that when a soluble form of organic matter was added to soils which were incubated in tumblers, a considerable quantity of nitrate nitrogen could be used by the micro-organisms of the soil. The amount of nitrate nitrogen assimilated was in a measure determined by the amount of nitrate present at the beginning, the form and amount of organic matter used, and the length of incubation period. Two percent of straw furnished sufficient carbon for the assimilation of 10 mgm. per 100 gms. of soil in one week, …

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

Proceedings of the Iowa Academy of Science

No abstract provided.

Soil Bacteriology As A Science, P. E. Brown

Proceedings of the Iowa Academy of Science

Soil Bacteriology or Soil Microbiology as it is often called is the science which treats of the microorganisms in soils, their character, life-history and functions and their relationship to the fertility or crop-producing power of the soil.

A Study Of The Membracidae Known To Occur In Iowa, Don W. Hookom

Proceedings of the Iowa Academy of Science

The writer has collected Membracids in several localities for some time, and also has exchanged specimens with collectors in this and other parts of the country. The specimens have been classified and are in the collection of Iowa Wesleyan College. The writer has compared his list with those listed by Dr. W. D. Funkhouser, authority on Membracidae at the University of Kentucky in his World catalog of Membracidae, and those listed by Herbert Osborn in the Iowa Academy of Science Proceedings of 1891.

College Catalogue 1929-1930, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

Calendar for 1930-31 ... 5
Officers of Administration and Instruction ... 6
Faculty ... 7
General Information ... 25
The School Plant and Location ... 25
History of the Institution ... 25
Extra-Curricular Activities ... 25
Expenses ... 28
Information of Special Interest to New Students ... 26
Expenses and Fees ... 28
Scholarships ... 30
Employment of Students ... 30
Loans ... 31
The Placement Bureau ... 31
Plan of Organization ... 32
Entrance Requirements ... 33
Advisers and Amount of Work ... 34
Absences and the Making up of Work ... 35
Grades and Scholarship …

A Statistical Test Of Experimental Technique, George W. Snedecor

Proceedings of the Iowa Academy of Science

The phrase "experimental technique" is used in a largely inclusive sense in this paper. A more precise title would be "A Statistical Test of Homogeneity." The reason for the more flexible phrase will be apparent, I trust, as the argument progresses.

Notes On Vertebrates Of Iowa Prairies, Geroge O. Hendrickson

Proceedings of the Iowa Academy of Science

During the past five years while the author was engaged primarily in a survey of insects his attention has been drawn occasionally to the vertebrate inhabitants of prairies of Iowa. One of the most frequently visited tracts is four acres of upland two miles north of Ames.

Some Home-Made Teaching Models, J. E. Guthrie

Proceedings of the Iowa Academy of Science

Models are of great value in teaching certain biological subjects. Nearly every teacher feels the need of certain models not obtainable from dealers. With practice and a fair degree of skill, these may be made for the occasion.

Comparative Growths Of Infusoria-Free And Normal Lambs, E. R. Becker, R. E. Everett

Proceedings of the Iowa Academy of Science

The digestive tracts of all ruminants are normally inhabited by Protozoa. It has been held by some that these are harmful; by others that they may be helpful in the digestion of cellulose and protein. Experiments in defaunating lambs by the use of copper sulphate indicated that the infusoria are not of importance, nor necessary for normal digestion in lambs.

Proceedings Of The Forty-Fourth Annual Meeting Of The Iowa Academy Of Science, Held At Ames, May 2 And 3, 1930: Minutes Of The Meeting; Staff & Committee Reports

Proceedings of the Iowa Academy of Science

No abstract provided.

The Status Of The Biological Sciences In The High Schools Of Iowa, C. W. Lantz

Proceedings of the Iowa Academy of Science

In the germination tests of alfalfa seed in the spring of 1930, one seed was discovered with two embryos. They were both normal in all structures, equal in size and behaved normally in germination. Multiple embryo sacs in the ovules of alfalfa are frequent, but it has been supposed that not more than one is able to mature and function. The presence of two embryos is evidence that two embryo sacs may mature and function.

Exhibits As An Aid In Teaching, O. B. Read

Science Bulletin

Complaint is often made that science subjects are difficult to teach. Many feel they are so abstract that there is nothing tangible with which to start. Since most of our industrial products are now very closely controlled by physical principles and chemical processes, it ought not to be difficult in the study of these subjects to arouse interest by calling attention to their uses in the industrial process.

Science Bulletin, Vol.2 No.4, December 1929 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Living Material In The Laboratory, O. R. Clark

Science Bulletin

Living plants and animals serve as valuable aids in stimulating interest in the biology course and, during that part of the year when field trips are impossible, provide material for the study of habits and the relation of organisms to their environment. Laboratory conditions are of course artificial but they should be made as nearly natural as it is possible to make them.

Teaching The History Of Science

Science Bulletin

Science has contributed more to our comfort, well being, and happiness than any other branch of knowledge. The other branches of knowledge are now taking the scientific method for the solving of their problems. Is it not important that science teachers should find some place in their teaching to teach some of the history of the development of science?

Winter Bird Study

Science Bulletin

What birds are to be found in your vicinity during the winter months? We would like to have observers from different parts of Iowa report to us a list of the winter birds they find, giving us the date of observation and the locality. We will be glad to publish your reports.

Title - Masthead

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Science Bulletin, Vol.2 No.3, November 1929 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Insects And Man, Roy L. Abbott

Science Bulletin

Biologically speaking, insects may be called a highly successful group, and much of this success is due to their adaptability to the conditions of their environment. They are found everywhere, and eat almost everything. All of the large groups of insects are world-wide in their distribution, though the most widely distributed are the beetles.

The Purple Pen, Volume 2, Number 1, November 1929 [Download Entire Issue]

Purple Pen

No abstract provided.

Some Illogical Logic, Richard Shane

Purple Pen

No abstract provided.

Science Minded, Harold E. Murphy

Science Bulletin

When we are trying to be "air minded " and "peace minded" why not go a little further and be 'science minded"? The aeronautic field has as its champion, Colonel Lindberg; the Peace Federation has as its champion, Ishbell McDonald; but where is the youthful champion of the field of chemical science? In this day of scientific advancement, a champion is surely needed to bring t h e achievement of chemical science to the people. Someone has said, "Science is the Creator's chest of tools. Human progress is man's learning to use these tools."

Title - Masthead

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Science Bulletin, Vol.2 No.1, September 1929 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Insects And Man, Roy L. Abbott

Science Bulletin

Mrs. Jiggs, in the cartoon, "Bringing up Father," frequently calls her husband an insect. This is a flagrant misuse of the term as an insect never has fewer nor more than six legs. It may be wingless as are the bedbugs, two winged as are all flies, or four winged as the grasshoppers, but no normal insect ever has more or less than six legs and by this one positive character you may know them.