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Acoustic Wave Filters In Solids, V. C. Hall
Acoustic Wave Filters In Solids, V. C. Hall
Proceedings of the Iowa Academy of Science
The purpose of the work was originally to extend work of Dr. G. W. Stewart on Acoustic Wave Filters in Air to the case where the transmitting medium is a solid. Due to the fact that transmission in solids consists of two types of waves, it is not possible to apply the original theory and recourse must be had, at least in the first instance, to experiment. The problem thus became one of finding an empirical formula which would aid in working out a special approximate theory for these filters.
On The Function Of The Paddle Of The Paddlefish, H. W. Norris
On The Function Of The Paddle Of The Paddlefish, H. W. Norris
Proceedings of the Iowa Academy of Science
There is a popular notion that the Paddlefish (Polyodon spathula) uses its paddle or snout as an organ of excavation in its search for food. Examination and consideration of the composition and texture of this organ ought to lead one to question the correctness of the popular opinion. The snout or rostrum of the common sturgeons may well be an organ of excavation, armed and protected as it is with bony plates, but the rostrum of the paddlefish is covered with a soft naked skin. Stockard (1907) has given us a very thorough and enlightening account of the …
Fish Foods In Relation To Fish Culture, Willis De Ryke
Fish Foods In Relation To Fish Culture, Willis De Ryke
Proceedings of the Iowa Academy of Science
The necessity for a solution to the fish culture problem was long ago felt in the crowded districts of Europe. The economic demand that food be produced for the ever increasing population of these districts resulted in directing attention to the comparatively waste small inland ponds and lakes, once plentifully inhabited by food fish but now almost completely exhausted. It was to meet this situation, then, that the pioneer fish culturists began working at methods to raise the waste waters to their former degree of productive usefulness in yielding food.
Vitamin Deficiency Studies : 1. The Relation Of Vitamin Deficiency To Muscle Fatigue In Rats, V. E. Nelson, F. M. Baldwin, Anna Gertrude Riggs, Marjorie Cunningham
Vitamin Deficiency Studies : 1. The Relation Of Vitamin Deficiency To Muscle Fatigue In Rats, V. E. Nelson, F. M. Baldwin, Anna Gertrude Riggs, Marjorie Cunningham
Proceedings of the Iowa Academy of Science
When the physiological performances of vitamin deficient rats are analyzed in conjunction with growth curves and other data, certain relationships are apparent. Fatigue curves produced by animals lacking vitamin B show progressive diminution in amplitude and endurance as the length of time on diet increases. These curves also show progressive loss of tonicity and an irregularity of contraction that seem very characteristic. Animals lacking vitamin A show similar curves which in amplitude and duration are roughly inversely proportional to the interval upon the diet but the decrease in tonicity is not so apparent. At the time the animals were used, …
Comparative Rates Of Oxygen Consumption In Marine Forms, Francis M. Baldwin
Comparative Rates Of Oxygen Consumption In Marine Forms, Francis M. Baldwin
Proceedings of the Iowa Academy of Science
The present paper presents data gathered by the writer in a study made on the rate of oxygen consumption in some of the marine fishes and invertebrates, and gives additional weight to a report by Professor Scott before the Society of Experimental Biology, XII, pp. 146-147.
The Losses Of Calcium From The Newton Experimental Field, Winfield Scott
The Losses Of Calcium From The Newton Experimental Field, Winfield Scott
Proceedings of the Iowa Academy of Science
Many experiment stations and many practical farmers have found lime beneficial to crop production. The kind of lime used has varied according to its accessibility. Some have used calcium oxide, some calcium carbonate, while others have used dolomite. Of recent years some of the experiment stations have advocated large applications of ground limestone rock, either as a carbonate or dolomite. The claim made by these stations is that the loss incurred by the larger application is not great enough to be of material value. In fact it is claimed that the loss is not great enough to pay the extra …
The Flora Of Pine Hollow, Dubuque County, Iowa, L. H. Pammel
The Flora Of Pine Hollow, Dubuque County, Iowa, L. H. Pammel
Proceedings of the Iowa Academy of Science
Dr. B. Shimek called my attention to making a state park out of Pine Creek Hollow or Pine Hollow as it is called and Dr. Thomas H. Macbride in his paper "Forestry Notes for Dubuque County" makes this comment on the Pine Hollow area in northwestern Dubuque county: "In Dubuque county the people of Liberty, New Wine, and Concord townships, have at hand in Pine Hollow, a park, the gift of nature, which centuries of human effort might hardly produce. Here are deep shades, rocky walls, trees and shrubs of every species indigenous to the soil, bubbling springs, with abundant …
Some Notes On Plants Of Whitehall, Michigan, L. H. Pammel, R. I. Cratty
Some Notes On Plants Of Whitehall, Michigan, L. H. Pammel, R. I. Cratty
Proceedings of the Iowa Academy of Science
During the latter part of August, 1920, the senior author spent a part of his vacation in the vicinity of Whitehall, Michigan. Whitehall is on Whitehall River at the head of Whitehall Lake, one of the numerous bays on the shore of Lake Michigan. At this and many other places on the shore of Lake Michigan, there are numerous sand dunes. The sand dunes at Whitehall are not nearly so fine as those at Muskegon, nor do they compare with those farther south in northern Indiana or eastern Illinois, on the shore of Lake Michigan.
Germination Studies Of Some Trees And Shrubs, L. H. Pammel, C. M. King
Germination Studies Of Some Trees And Shrubs, L. H. Pammel, C. M. King
Proceedings of the Iowa Academy of Science
The study of germination of seeds of trees and shrubs was continued during the years 1922 and 1923. The seeds considered were very lightly covered, and left upon the ground out of doors to winter; the season was moderate, both in temperature and in snowfall. The seeds seemed in excellent condition when lifted in the spring. Before they were planted in the greenhouse, all seeds were scratched, a small file being used to break the outer seed coat.
The Occurrence Of Juniperus Horizontalis In Floyd County Near Rockford, L. H. Pammel
The Occurrence Of Juniperus Horizontalis In Floyd County Near Rockford, L. H. Pammel
Proceedings of the Iowa Academy of Science
The occurrence of the prostrate Juniper (Juniperus horizontalis) in Iowa is so unusual that an account of the habitat and associates will be of interest. Some years ago Mr. C. L. Webster and Mr. H. Clark Brown of Charles City sent me some specimens of this savin which Mr. Brown said was native to this general region. Its occurrence was so unusual that I felt it might have been introduced. During July, 1922, the writer, Professor G. B. MacDonald and Mr. C. L. Webster visited the place and observed the plant, which covers an area of some ten acres on …
Notes On Introduced Plants, Robert B. Wylie
Notes On Introduced Plants, Robert B. Wylie
Proceedings of the Iowa Academy of Science
Unexpected results frequently follow the introduction of plants and animals into new regions. The transplanted organism often shows unusual vigor and may become a disturbing factor in the new home where it may not even perform the intended service. Since the introduced form frequently leaves behind its worst enemies or chief competitors it sometimes develops amazingly in the new environment.
Cuscuta In Iowa, G. L. Wittrock
Cuscuta In Iowa, G. L. Wittrock
Proceedings of the Iowa Academy of Science
The Cuscuta collection in the Grinnell herbarium has been critically revised with the aid of a new monograph by Freemen George Yuncker. Subsequently, the collection at the State College at Ames was critically reviewed. Grateful acknowledgment is made to those in charge of the herbarium for the privilege. The following paper may then be regarded as a record of the occurrence and distribution of Cuscuta in Iowa. We find eleven species in the state. According to Yuncker, the range of one other species includes the state of Iowa, but so far, no specimen from the state is on record. In …
Citation Of Authorities For Latin Names, Henry S. Conard
Citation Of Authorities For Latin Names, Henry S. Conard
Proceedings of the Iowa Academy of Science
To what extent is it significant to cite the names of authorities after the latin names of plants and animals? This is an old question but one which, it seems to me, is not yet fully settled. What is the best practice for you and for me? Three methods of citation are in current use. Some cite only the originator of the combination of genus and species, as in Bailey's Standard Cyclopedia of Horticulture (Nupar luteum, Sibth. and Smith). Others cite always the originator of the specific name, followed by the author of the combination when that is by another …
The Arborescent Flora Of Midwest Farmsteads, T. J. Fitzpatrick
The Arborescent Flora Of Midwest Farmsteads, T. J. Fitzpatrick
Proceedings of the Iowa Academy of Science
While the writer was making a canvass of Buffalo County, Nebraska, during August, 1922, for the purpose of eradicating the common barberry, he became interested in trees and shrubs usually planted in rural dooryards. Buffalo County is situated on the north bank of the Platte river, near the south-central part of Nebraska, in the semiarid region. The rainfall is about twenty-five inches per year as an average, with years of much less, as was the year 1922, when the amount was about nineteen inches.
Methods Of Modeling The Agaricaceae, Kathryn Gilmore
Methods Of Modeling The Agaricaceae, Kathryn Gilmore
Proceedings of the Iowa Academy of Science
As it is practically impossible to preserve the fleshy fungi in any way to retain their original shape and color, the following plans were developed in making a collection of models for Iowa Wesleyan College.
Equilibrium Between Strontium Bromide And Bromine In Aqueous Solutions Of Strontium Bromide, J. N. Pearce, J. V. O'Leary
Equilibrium Between Strontium Bromide And Bromine In Aqueous Solutions Of Strontium Bromide, J. N. Pearce, J. V. O'Leary
Proceedings of the Iowa Academy of Science
The study of the equilibrium between bromine and the uni-univalent bromides, more especially potassium bromide, in aqueous solution has been the subject of numerous investigations. It has become a generally accepted idea that an ionizable compound is formed of the type, KBr + Br2 = KBr’ Br2.
The Free Energy Of Dilution And The Activities Of The Ions Of Hydrogen Iodide In Aqueous Solutions, J. N. Pearce, A. R. Fortsch
The Free Energy Of Dilution And The Activities Of The Ions Of Hydrogen Iodide In Aqueous Solutions, J. N. Pearce, A. R. Fortsch
Proceedings of the Iowa Academy of Science
Because of their anomalous behavior solutions of strong electrolytes have long occupied the attention of numerous investigators. Many attempts have been made to provide a theoretical explanation of the abnormalities. Of the various solution properties the free energies of dilution and the activities of the ions have been especially studied. From calculations based on the assumption that a common ion at any given concentration has the same mobility regardless of the associated ion Lewis has concluded that the chlorides, bromides and iodides of hydrogen and of the alkali halides are equally dissociated in 0.10 M solutions.
Lake Huron Winter Beach Forms, Max Littlefield
Lake Huron Winter Beach Forms, Max Littlefield
Proceedings of the Iowa Academy of Science
In connection with a few days' field work on the delta of St. Clair River, the writer spent one day, December 25, 1922, on the Lake Huron beach of Point Edward, adjacent to and directly east of the head of St. Clair river and two miles north of Sarnia, Ontario.
1923 Little Tutor, Iowa State Teachers College High School
1923 Little Tutor, Iowa State Teachers College High School
Malcolm Price Laboratory School Yearbooks
The student yearbook of the Teachers College High School (later the Northern University High School, part of the Malcolm Price Laboratory School of the University of Northern Iowa).
The Structure Of Some Nectar Glands Of Iowa Honey Plants, William S. Cook
The Structure Of Some Nectar Glands Of Iowa Honey Plants, William S. Cook
Proceedings of the Iowa Academy of Science
The anatomical study of nectar glands was taken up at the suggestion of Dr. L. H. Pammel, who for many years has been interested in honey plants and their economic importance in Iowa. The structure of nectar glands has not received much attention from the present day botanist. He takes for granted that they are present; but that is about as far as he goes. Older botanists of the eighteenth century were much interested in the subject of nectar glands. Glands of many plants were studied thoroughly, that is as thoroughly as could be done with the equipment they possessed. …
Fall Term Commencement [Program], December 5, 1922, Iowa State Teachers College
Fall Term Commencement [Program], December 5, 1922, 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.
The Alumni News Letter, V6n4, October 1, 1922, Iowa State Teachers College
The Alumni News Letter, V6n4, October 1, 1922, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
The Alumni News Letter, V6n3, July 1, 1922, Iowa State Teachers College
The Alumni News Letter, V6n3, July 1, 1922, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
Spring Term Commencement [Program], May 30, 1922, Iowa State Teachers College
Spring Term Commencement [Program], May 30, 1922, 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.
Supplement To Alumni News Letter [V6n2] For April 1, 1922, Iowa State Teachers College
Supplement To Alumni News Letter [V6n2] For April 1, 1922, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
The Alumni News Letter, V6n2, April 1, 1922, Iowa State Teachers College
The Alumni News Letter, V6n2, April 1, 1922, Iowa State Teachers College
The Alumni News Letter
Contains news of the College and its alumni.
Winter Term Commencement [Program], March 7, 1922, Iowa State Teachers College
Winter Term Commencement [Program], March 7, 1922, 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.
Title Page - Front Matter
Proceedings of the Iowa Academy of Science
No abstract provided.
The Path Of A Rigid Electron Which Moves In A Magnetic Field Of Constant Strength Rotating With Constant Angular Velocity, E. O. Hulburt
The Path Of A Rigid Electron Which Moves In A Magnetic Field Of Constant Strength Rotating With Constant Angular Velocity, E. O. Hulburt
Proceedings of the Iowa Academy of Science
Equations of motion of a rigid electron in a uniformly rotating magnetic field of constant strength rotating with a frequency w/2π in the XZ plane are obtained. The reactions on the motion due to finite size, radiation from the electron and the field, and the variation of mass with velocity are neglected. If initially the velocity of the electron has components only along the X-axis or the Z-axis the path of the electron is a wavy curve inside an annular space whose axis is parallel to the Y-axis. If the initial velocity of the electron has components only …