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Back Matter

Purple Pen

No abstract provided.

Aftermath, Jane Becknell

Purple Pen

No abstract provided.

Joy, Irma Dovey

Purple Pen

No abstract provided.

Bachelor's Row, Ted Martens

Purple Pen

No abstract provided.

Friends, Irma Dovey

Purple Pen

No abstract provided.

Science Bulletin, Vol.2 No.6, February 1930 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Charley's Death, Irving Hart Jr.

Purple Pen

No abstract provided.

Household Insects, Roy L. Abbott

Science Bulletin

It was said above (see November Bulletin) that practically every animal is attacked by one or more kinds of insects. Man constitutes no exception to this statement, and it is my purpose in this article to deal with a few of the insects commonly found in or around our homes. Perhaps the most familiar of all household insects is the housefly.

A Classified Bibliography Of References For General Agriculture, Winfield Scott

Science Bulletin

III. FORAGE CROPS

A. Legumes.

Mechanisms Of Addition And Substitution Reactions Of Furfural And Derivatives, Henry Gilman, G. F. Wright, J. B. Dickey, A. P. Hewlett

Proceedings of the Iowa Academy of Science

In a complete series of substitution reactions (such as halogenation, nitration, mercuration, etc.,) of furfural and its derivatives, it appears that substitution is preceded by addition. For example, in bromination, two atoms of bromine first add to give a relatively unstable intermediate which then loses hydrogen bromide. These preliminary additions may be 1, 2- or 1, 4- or 1, 6- additions depending upon reactants and upon experimental conditions. Accompanying some of these transformations are ring fission and ring closure, and rearrangements involving unsaturated linkages. Typical illustrations of these changes were presented.

Iowa State Teachers College Program Of Recitations, Winter 1929-1930, 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.

The Change Of Phase On Reflection Of Light From The Silvered Interfaces Of An Etalon, E. Hobart Collins

Proceedings of the Iowa Academy of Science

In making wavelength determinations to the accuracy of one-thousandth of an Angstrom with a Fabry and Perot Etalon it is necessary to know the wavelength of the line to one-tenth of an Angstrom, the thickness of the etalon and the change of phase on reflection of the light from the interfaces of the etalon. This change of phase is a function of the wavelength, varies with the metal, the way it is deposited and with the surface upon which it is deposited. A separate determination must be made for each etalon. This change of phase is usually expressed as a …

Science Bulletin, Vol.2 No.5, January 1930 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

Table Of Contents

Proceedings of the Iowa Academy of Science

No abstract provided.

Iowa Plants Notes, Iv, R. I. Cratty

Proceedings of the Iowa Academy of Science

In three former papers the writer has listed numerous plants new to our state, or noteworthy for other reasons. As might be expected a large number of these have been introduced from other portions of the United States or from foreign countries. Some of these plants may prove to be merely waifs, never becoming a permanent part of our flora, but this is a matter which only time can decide. Even some of our southern immigrants are steadily creeping northward, and are proving that they can withstand our severe northern winters, while some old world species find our rich soil …

Notes On Iowa Mosses Ii, Lucy M. Cavanagh

Proceedings of the Iowa Academy of Science

The object of this paper is to note, with comments and corrections, certain published lists of Iowa mosses. A short paper by the late Dr. Charles E. Bessey is, so far as the writer is able to find, the first published list of Iowa mosses.

Simultaneous Development Of The Seed Coat And Embryo In The Seeds Of Sweet Clover, John R. Watt

Proceedings of the Iowa Academy of Science

Sweet clover is one of our leading forage crops. Its value as such is materially decreased by the large per cent of impermeable seeds which do not germinate the first year. This increases the expense of seeding. Furthermore, such seeds may germinate in later years and the plant become a weed.

Single Spore Isolation, W. H. Davis

Proceedings of the Iowa Academy of Science

During the past generation, Bacteriologists and Plant Pathologists have developed a technique for isolating unicellular forms of life. The purposes of these isolations have been to study the life history, polymorphism, physiology, parasitism and finally the classification of organisms. A brief historical review of these methods of isolation, especially those of single spores, might aid investigators in their researches and stimulate them to construct better apparatus and employ a superior technique.

Heliantheae Of Iowa Ii, M. Rae Johns

Proceedings of the Iowa Academy of Science

The first paper on Heliantheae of Iowa included the genera Galinsoga, Eclipta, Actinomeris, Parthenium, Polymnia, Ambrosia, Iva, and Xanthium. This list was made up of the introduced, the doubtful, and some of the obnoxious weed species of the Tribe Heliantheae. The review covered the history and the distribution of the species in the United States and in Iowa. In the descriptions of the species, emphasis was laid on the minute details of the floral structures in the effort to bring out the distinctive and possibly hitherto unnoted features that mark the species.

A Large Fragment Of Proboscidian Tusk Found Near Glenwood, Iowa, And Notes Of Similar Finds, Paul Rowe

Proceedings of the Iowa Academy of Science

In September, 1929, Mr. Howard Miller showed the writer a partly exposed tusk which he thought was a petrified log. It was dug out on October 7th, and found to be 6 feet long, 7¾ inches by 6 inches at the big end, and over 5 inches in diameter at the broken end. It lay in the bed of some tiny glacial or post-glacial stream. Most of it fell to fragments when moved. At a point 1½ miles west the author has found 7 proboscidian teeth and some other bones in the present stream bed.

Ice Caves, John E. Smith

Proceedings of the Iowa Academy of Science

The locations, structure and meteorologic conditions favorable to forming ice and to its wasting away are considered in this paper.

Problems Suggested By An Uncertainty Principle In Acoustics, G. W. Stewart

Proceedings of the Iowa Academy of Science

At the suggestion of Professor A. Lande the principle adopted is Δv. At = 1, where v is the intrinsic frequency of an acoustic signal and At is its time duration. Applying this principle one finds that it is consistent with experiments on the change in v in the vibrato and the failure to detect it by ear, with recorded tests on minimum perceptible differences in frequency, and with the minimal time for tone perception.. The problems suggested by the principle are: (1) Variations in At and Av by an artificial vibrato with aural observations of detectable Av, (2) redetermination …

On The Conductivity Of Cod Liver Oil, L. W. Butler

Proceedings of the Iowa Academy of Science

Further experiments have been conducted on the conductivity of cod liver oil under varying conditions. All experiments on the variation of conductivity with temperature have shown that the conductivity increased with the temperature. By plotting the logarithm of resistance against temperature, straight lines were obtained over considerable ranges of temperatures. The breaks in these curves were apparently quite sharp but did not occur at the same temperatures with different trials even though oil from the same bottle was used. The resistance became very unstable at temperatures around 85°C.

Twelve Hundred Miles Of Winter Birds, Chas. J. Spiker

Proceedings of the Iowa Academy of Science

During January of the present year (1930) I had occasion to drive from New Hampton, Iowa, to Canastota, New York, a distance in direct line of perhaps not over a thousand miles, but with the inclusion of side trips and an occasional detour, about two hundred miles was added. I left New Hampton at noon, January 16th, and arrived at Canastota the evening of January 25th. A list of the birds seen enroute was closely kept. Most of those observed were seen from the road as I was driving along, but some were added when I would stop for a …

The Iowa Piano Camera: Some Preliminary Findings, Laila Skinner

Proceedings of the Iowa Academy of Science

Objective analysis of the voice and many musical instruments can be made by simply photographing the sound wave and measuring time, intensity and timbre from the records. Piano performances cannot be studied in this way because of complexities produced in the sound waves when notes are played simultaneously.

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.

Freak Color Inheritance In Graham's Watersnake, J. E. Guthrie

Proceedings of the Iowa Academy of Science

The genus Natrix, found in both hemispheres, comprises about 15 North American species and sub-species. They are rough-scaled, non-venomous serpents living in the vicinity of water and producing living young, often in large broods. They are closely related to the garter snakes. Some of them are commonly known as "'Water moccasins." The different species usually range between two and four feet in length. They are especially abundant in the southern states. Among the smaller species of the genus is one known as Graham's watersnake Natrix grahamii (Baird and Girard). It seldom reaches a yard in length and appears not to …

Some Peculiarities Of The Plagiostome Ear, H. W. Norris

Proceedings of the Iowa Academy of Science

1. External pore (leading to labyrinth. Willughby (?) , 1686. 2. Endolymphatic pouch (doubtfully homologous to endolymphatic sac) lying in the parietal fossa. Monro, 1785. 3. Muscle of parietal fossa (inserted on endolymphatic pouch). Weber, 1820. 4. Utriculus divided into anterior and posterior sections, not directly connected with each other. Retzius, 1878, 1881. 5. Otoconia instead of otoliths. Breschet, 1838. These peculiarities were discovered many decades ago; most of them are in general ignored by present day comparative anatomists and writers of laboratory manuals.

The Alumnus, V14n1, January 1930, Iowa State Teachers College

The Alumnus

Inside This Issue:
-- A History of the Alumni News Letter
-- Annual Banquet Breaks Record
-- Sixty-Nine Awarded Diplomas at Fall Term
-- Greatest Homecoming Is Colorful Event
-- A Memorial Envisioned For This Great Teacher
-- Alumni Launch Plans To Build Theater
-- New Items of the College
-- Basketball Ascends Sports Throne
-- Grid Squad Ties Second Place in Conference
-- Alumni News
-- Marriages
-- Births
-- Deaths
-- A Laboratory of Life