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A Statistical Test Of Experimental Technique, George W. Snedecor
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.
The Color Of Meats And Of The Munsell Color Charts Compared, A. A. Benedict
The Color Of Meats And Of The Munsell Color Charts Compared, A. A. Benedict
Proceedings of the Iowa Academy of Science
At the present time the most common method of measuring the color of meats consist in a comparison of the surface with a Munsell Color Disc, or a Munsell Color Chart. This method is considered quite satisfactory by some authorities, but its reliability is seriously questioned by others. This paper is a continuation of the work reported at the Academy meeting a year ago. A great many more readings have been made in which cuts were used that varied quite widely in quality. Also, a comparison has been made between the various Munsell Color Charts, and between cuts of meat …
Some Recent Developments In High Pressure Windows, Robert Wilson, Thos. C. Poulter
Some Recent Developments In High Pressure Windows, Robert Wilson, Thos. C. Poulter
Proceedings of the Iowa Academy of Science
The field of optical studies at high pressures has been limited to a range of a few thousand atmospheres not because glass would not withstand a higher pressure but because the proper window support had not been used in order to utilize the maximum strength of the glass.
Magnetization Of Electrolytic Nickel Films, E. P. T. Tyndall, H. E. Malmstrom
Magnetization Of Electrolytic Nickel Films, E. P. T. Tyndall, H. E. Malmstrom
Proceedings of the Iowa Academy of Science
The magnetic properties of nickel films electrolytically deposited on brass tubes are determined by the method previously described for Iron and Cobalt films (Phys. Rev. 30, 681 (1927); 35 292 (1930). Films about 130 rnμ thick attain a magnetization of about 380 c. g. s. units in a field of 200 gauss, a value about equal to that for bulk nickel. As in Iron and Cobalt the coercive force is high, but the remanence is somewhat less than was found for iron and cobalt.
Absorption Spectrum Of Vitamin A Concentrates, Jay W. Woodrow, J. B. Philipson
Absorption Spectrum Of Vitamin A Concentrates, Jay W. Woodrow, J. B. Philipson
Proceedings of the Iowa Academy of Science
This is a continuation of the work previously reported by Woodrow and Cunningham (Phys. Rev., vol. 35, p. 125, Jan. 1930) on the absorption spectrum of several common sources of vitamin A. Through the kindness of Dr. Morton of the University of Liverpool, it has been possible to investigate the absorption spectra of much more concentrated sources of vitamin A. Slight changes which have been made in the arrangement of the photoelectric spectrophotometer have given more dependable results, partly because they have greatly reduced the destruction of the vitamin A by the ultra-violet light used in taking the measurements. Prominent …
The Effect Of Gas-Pressure On Tesla-Luminescence, G. M. Wissink
The Effect Of Gas-Pressure On Tesla-Luminescence, G. M. Wissink
Proceedings of the Iowa Academy of Science
In investigating the tesla-luminescence of cod-liver oil, it was observed that the nature of the luminescence would change very rapidly with the pressure. This effect was noticed for the cod-liver oil vapor, for carbon-dioxide and for air. In the case of air it was found that there was an abrupt change from a pinkish glow at about 4 mm. pressure to a bright orange at about 2 mm. The actual value of the pressure at which this effect took place has not as yet been accurately determined. A preliminary spectroscopic study of the luminescence has shown that bands which are …
Factors Influencing The Electrical Resistance Of The Potato, E. C. Mccracken
Factors Influencing The Electrical Resistance Of The Potato, E. C. Mccracken
Proceedings of the Iowa Academy of Science
Extensive experimentation upon the electrical resistance of raw potatoes has given the following results: (1) the resistance of a uniformly shaped section varies inversely as its cross-sectional area; (2) the resistance is independent of the applied voltage; (3) the resistance of sections taken from a relatively homogeneous part of the tuber varies directly with the length; (4) the cortical layer lengthwise of the potato has the least resistance, the resistances of internal medullary area, the external medullary area, and the outer skin following in the order named. No investigation was made upon the resistance of the cortical layer transverse to …
Velocity Of Ultra-Sonic Waves In Vapor, George E. Thompson
Velocity Of Ultra-Sonic Waves In Vapor, George E. Thompson
Proceedings of the Iowa Academy of Science
The velocity of sound waves having a frequency of 107,500 cycles per second has been measured in water vapor and in ether vapor. The waves are generated by a quartz crystal oscillator and velocities measured by an interference method similar to that used by Pierce. The sound chamber is made air tight. After thorough exhaustion of the chamber with an air pump the vapor is introduced through a stop cock which connects the chamber with a glass bottle containing vapor. The sliding joint, through which the rod carrying the sound reflector passes, is made air tight by means of a …
A Statistical Study Of Industrial Science Students Of The Class Of 1926, Gertrude M. Cox
A Statistical Study Of Industrial Science Students Of The Class Of 1926, Gertrude M. Cox
Proceedings of the Iowa Academy of Science
This study was carried through with three main objectives in view, 1. To find the relationship between the Iowa State College Aptitude Test (as a whole and in parts), the social and memory tests, work done in high school, and work done in college. 2. To determine the percentage of students; (a) who remained in college (b) who were dropped from college either by their own request or by the request of the scholarship committee. 3. To see if it is possible to determine which high school students should be allowed to enter Iowa State College.
Judging Children's Literature, Ivy C. Husband
Judging Children's Literature, Ivy C. Husband
Proceedings of the Iowa Academy of Science
This study is the outgrowth of the work being done by the Institute of Character Research at the State University under Professor Edwin D. Starbuck. The Institute is publishing a series of guides to literature: lists of books which have a definite character value in and of themselves. These books are ranked, graded, and assigned "situations" indicating the type of situation and attitude toward it which will probably impress the reader.
A Sound Wave Analysis Of Tlingit Speech, Ray E. Miller
A Sound Wave Analysis Of Tlingit Speech, Ray E. Miller
Proceedings of the Iowa Academy of Science
The sound waves from a phonograph record of a Tlingit Indian's speech were photographed on the Metfessel strobo-photograph. The curves on the strobo-photograph film were traced onto a reduced musical-scale chart by means of an especially designed transcribing machine. The analysis, which was limited to the frequency of vibration and duration of the sounds, was made under two main headings: (1) intervals, and (2) intonations.
Mean Free Path Of Gases By A Direct Method, John A. Eldridge
Mean Free Path Of Gases By A Direct Method, John A. Eldridge
Proceedings of the Iowa Academy of Science
Apparatus consists of a brass tube partitioned into chambers. Partitions contain small holes which are exactly aligned. Gas is introduced at a pressure of several millimeters at one end; a vacuum is maintained in other chambers by rapid pumping and the molecular beam passing through the aligned holes is measured by impact upon a vane suspended from a quartz fiber. Introduction of a gas in one of intermediate chambers deflects away a definite proportion of the beam giving a direct measure of the mean free path.
Bird Records Of Two Winters, 1920-1922, In The Upper Missouri Valley, T. C. Stephens
Bird Records Of Two Winters, 1920-1922, In The Upper Missouri Valley, T. C. Stephens
Proceedings of the Iowa Academy of Science
The writer has published three papers in the Proceedings of this Academy dealing with the winter bird life in the Missouri River region during the years from 1916 to 1920. More recently Mr. Chas. J. Spiker has published a paper on the same subject dealing with the years from 1922 to 1926. The present paper is intended to bridge the gap between these two periods and to place in permanent form a few very interesting and important records of the bird life in the region dealt with.
Some Needed Bird Observations In Iowa, Walter W. Bennett
Some Needed Bird Observations In Iowa, Walter W. Bennett
Proceedings of the Iowa Academy of Science
Since Dr. Rudolph M. Anderson wrote "The Birds of Iowa" in the year 1907 there have been many changes in conditions over the state. Population has greatly increased, rural districts have become much more thickly settled, sloughs have been drained, woods have been felled, and spots of untouched wild prairie are now a curiosity. These have greatly changed our bird life. So have other influences. Surprising it is that Dr. Anderson's splendid book, which is still the authoritative publication for the state, has so well stood the test of time, yet twenty-three years since its issuance cannot do other than …
The Psychology Of Division, H. A. Jeep
The Psychology Of Division, H. A. Jeep
Proceedings of the Iowa Academy of Science
Recent attempts to clarify the subject of long division point to the fact that it is difficult. All data considered, we may say that it is the hardest block in the elementary school curriculum. Long division is especially difficult for the fourth-grader. It is apparent that the multiplicity of skills accounts for much of the learning difficulty. Because there are no infallible rules to follow, long division approaches the problem solving situation. In a sense, every example in long division tends to become a distinct problem in itself.
Two Cases Of Abnormal Incisors In White Rats, J. E. Guthrie
Two Cases Of Abnormal Incisors In White Rats, J. E. Guthrie
Proceedings of the Iowa Academy of Science
In some class work done in the Department of Zoology and Entomology recently several white rats were used. These animals were procured from the Chemistry Section of the Iowa Experiment Station. The rats were all adult males and had been fed mainly on a diet of soft food.
A Study Of Variation In The Markings Of Chauliognathus Pennsylvanicus De G. And Chaulioganthus Marginatus Fab., Etelka Rockenbach
A Study Of Variation In The Markings Of Chauliognathus Pennsylvanicus De G. And Chaulioganthus Marginatus Fab., Etelka Rockenbach
Proceedings of the Iowa Academy of Science
The family Cantharidae includes among its more common members the soldier-beetles, belonging to the genus Chauliognathus. Of the fourteen species of this genus known to occur in North America, the two species herein considered, are the only ones at all common in the central and eastern United States.
The 1929 Distribution Of White Grubs In Iowa, H. E. Jaques
The 1929 Distribution Of White Grubs In Iowa, H. E. Jaques
Proceedings of the Iowa Academy of Science
The farmcrops of Iowa pay a heavy toll annually to insects. While many species figure in this loss to the farmers, a comparatively small number of species are responsible for a very large percentage of the total destruction. White grubs, the larval form of the May beetle, find place among these most destructive forms and if taken over a considerable period of years should likely be ranked most expensive of all.
Notes On Vertebrates Of Iowa Prairies, Geroge O. Hendrickson
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.
The Influence Of Intelligence And Other Factors On The Type Of Punishment Administered To Children, E. G. Lockhart
The Influence Of Intelligence And Other Factors On The Type Of Punishment Administered To Children, E. G. Lockhart
Proceedings of the Iowa Academy of Science
This report is based on the answers given by twenty-five hundred children in certain Iowa public schools to a brief questionnaire viz: 1. Have you ever been punished at home? (underscore the right word) Yes, often; Seldom; Once only; Never. 2. How were you punished at home? By scolding; slapping; whipping; other ways -_______________________ 3. Have you ever been punished at school? Yes, often; Seldom; Only once; Never. 4. How were you punished at school? Scolding; Slapping; Keeping in; Whipping; Other ways ___________________ 5. If you were a parent or a teacher how would you punish a child? (underscore your …
Some Home-Made Teaching Models, J. E. Guthrie
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
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.
Title Page - Front Matter
Proceedings of the Iowa Academy of Science
No abstract provided.
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.
In Memoriam: George Luther Smith; Henry Albert; D. S. Fairchild; George Bennett, James H. Lees, L. H. Pammel, Florence Sinclair Chapin
In Memoriam: George Luther Smith; Henry Albert; D. S. Fairchild; George Bennett, James H. Lees, L. H. Pammel, Florence Sinclair Chapin
Proceedings of the Iowa Academy of Science
No abstract provided.
Factors Influencing The Production Of Acetic Acid From Corn Stalks By Thermophilic Bacteria, C. H. Werkman, R. H. Carter
Factors Influencing The Production Of Acetic Acid From Corn Stalks By Thermophilic Bacteria, C. H. Werkman, R. H. Carter
Proceedings of the Iowa Academy of Science
No abstract provided.
Studies On Nitrogen Fixation In Some Iowa Soils, R. H. Walker
Studies On Nitrogen Fixation In Some Iowa Soils, R. H. Walker
Proceedings of the Iowa Academy of Science
No abstract provided.
Study Of The Weeds Of Alfalfa Fields Of Iowa, A. L. Hershey, L. H. Pammel
Study Of The Weeds Of Alfalfa Fields Of Iowa, A. L. Hershey, L. H. Pammel
Proceedings of the Iowa Academy of Science
During the past few years a study has been made of the weeds occurring in the alfalfa fields of Iowa, and of their effect upon crop production. The work reported here was clone in the summers of 1928 and 1929.
Notes On Iowa Grasses, Robert P. Adams
Notes On Iowa Grasses, Robert P. Adams
Proceedings of the Iowa Academy of Science
In presenting this list of Iowa Grasses, no claim is made of reporting any species new to the state. The list does include, however, a number of rarer forms, species that are very local in habitat or in distribution and several strays and introductions that are perhaps worthy of mention. There have been a number of systematic lists of Iowa grasses published heretofore. None of them have emphasized to any great extent the habitat, the ecological side of their distribution. It is to stress this phase of grass study, that the present paper is written. Grasses furnish valuable criteria of …
Additional Notes On Iowa Mosses — 1929-1930, Betty Blagg
Additional Notes On Iowa Mosses — 1929-1930, Betty Blagg
Proceedings of the Iowa Academy of Science
Since the meeting of the Iowa Academy of Science in May, 1929, several additions have been made to the collections of H. S. Conard, B. O. Wolden, and Betty Blagg. In order to prevent an inconveniently large number of moss lists, the additions of all three collectors have been combined into one list. Only those new to the state are included although a number of species have been added to all three collections which have been reported for Iowa only once.