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Some Proboscidian Remains Found In Henry County, H. E. Jaques

Proceedings of the Iowa Academy of Science

Rather frequent discoveries of the remains of at least two species of the extinct elephant-like animals which inhabited this continent during the Pleistocene have been made in Henry County. These specimens have been found in several parts of the county, and have usually been limited to tusks and teeth. A number of bones have been found but in most cases in such condition as to make identification difficult. At least two of these finds are sufficiently noteworthy to deserve some permanent record.

A Laboratory Optical Pyrometer: Notes On Its Design And Operation, Wm. Schriever

Proceedings of the Iowa Academy of Science

The writer was confronted with the problem of measuring the temperature of a tungsten wire enclosed in an evacuated tube. A thermocouple could not be used because it would be certain to apply unknown torques to the wire and also to disturb the temperature distribution along the wire. An optical or radiation method of temperature measurement would overcome both of these difficulties. An optical pyrometer suitable for accurate temperature determinations and flexible enough to be of general use in a physical laboratory is not on the market at the present time. This led the writer to the task of designing …

Measurements Of The Minimum Audible Intensity Of Sound For Tones Of High Frequency, C. E. Lane

Proceedings of the Iowa Academy of Science

Many investigators have worked on the problem of determining the minimum amount of sound energy necessary for audible perception, but most of the investigations have been concerned with sounds of ordinary frequency and very little attempt has been made to make such a determination in absolute units near the upper limit of the range of audition. The mechanical difficulty of securing tones of sufficient intensity at these high frequencies is great, and, furthermore, it is not so easy to ascertain the amount of sound energy given out from the sounding apparatus at these values of frequency as at lower values.

A Single Band Acoustic Wave Filter, G. W. Stewart

Proceedings of the Iowa Academy of Science

Theoretical considerations lead to the conclusion that a single band acoustic wave filter can be made in a manner analogous to the electric wave filter and also that in the acoustic case there should be a repetition of the band at high frequencies. The accompanying drawing shows the results of experiments with two filters whose dimensions also are indicated.

A Note On Kater's Reversible Pendulum, L. P. Sieg

Proceedings of the Iowa Academy of Science

In one of our laboratory classes recently, in connection with a routine experiment with Kater's pendulum, certain of the students were confronted with the situation in which, although the periods of vibration from each of the two knife edges were practically identical, the distance between the knife edges was by no means equal to the length of the equivalent simple pendulum. None of the treatises on dynamics available offered any help in their difficulty. In all the discussions it was virtually stated that when the periods from the two knife edges were equal the distance between knife edges was equal …

The Absorption Of Light Passing Through Deep Slits As A Function Of The Length And Depth Of The Slits And Of The Wave Length Of The Light, L. P. Sieg, A. T. Fant

Proceedings of the Iowa Academy of Science

As indicated by Rayleigh, practically every slit is a "Deep" slit, and a "Thin" slit can be obtained only with the greatest difficulty. Rayleigh used for the latter a fine scratch in a thin silver film deposited upon glass. In the present work experiments were made with a series of slits with steel jaws, varying in depth from that of the thin safety razor blades to approximately 2.5 cm. The intensity of the transmitted light was experimentally determined as a function of the width and depth of the slits, and of the wave length of the light. For narrow slits, …

The Tactual Analog Of Stroboscopy, L. E. Dodd

Proceedings of the Iowa Academy of Science

The subject of coincidences has application in stroboscopy, or the stroboscopic effect, in vision, and in the phenomenon of musical beats in audition. By means of a suitable mechanical device it applies also to the tactual sense. There may thus be produced tactual, as well as musical and optical beats.

The Blackening Of A Photographic Plate As A Function Of Intensity Of Monochromatic Light And Time Of Exposure, P. S. Helmick

Proceedings of the Iowa Academy of Science

By an empirical modification of Hurter and Driffield's and Ross formulae, it has been possible to express the blackening of a photographic plate exposed to monochromatic light as a function of intensity of light and time of exposure with an accuracy within the limits of the experimental data at hand. By means of monographic charts the constants of the equations can be computed by semi-graphical methods.

The 1921 Outbreak Of The Clover-Leaf Weevil In Iowa, H. E. Jaques

Proceedings of the Iowa Academy of Science

Early in the spring of 1921 it became apparent that many clover meadows were suffering severely from some trouble. The entire stand was killed in an occasional field while in others patches throughout the fields were killed or the plants were very much stunted. At first it was thought by many to be winter-killing but it was soon found to be insect injury due to the work of the Clover-leaf Weevil, Hypera punctata Fab., and one or more species of cut worms. It was thought in some quarters that the matter was further complicated by the presence of a fungus …

Analysis Of Certain Smooth Muscle Responses, B. M. Harrison, Francis M. Baldwin

Proceedings of the Iowa Academy of Science

The fact that smooth muscles differ fundamentally in their structure from the cross-striated form, and that they possess distinctive physiological properties, especially in their toxicity, rhythm and rate of response, has made them the object of rather extended investigations. It is not necessary here to review extensively the literature dealing with the various points of attack contributory to an understanding of the responses of such elements. The present paper is a preliminary report of an attempt to analyze the responses of smooth muscles when subjected to different conditions, and especially when immersed in solutions of computed strengths of the alcohols, …

Distribution Of The European Elm Scale, Albert Hartzell

Proceedings of the Iowa Academy of Science

On May 27, 1919, an American elm on the Iowa State College grounds at Ames was found to be infested with European elm scale (Gossyparia spuria). Since the above date several other Iowa records have been added to our list and a considerable amount of information has been obtained regarding the distribution of this species in the United States and Canada through correspondence with State Entomologists, the U. S. Bureau of Entomology and Agricultural Experiment Station workers in states in which scale was thought likely to occur.

The Readjustment Of The Peripheral Lung Motor Mechanism After Bilateral Vagotomy, T. L. Patterson

Proceedings of the Iowa Academy of Science

It has been shown by Carlson and Luckhardt (1) in crucial experiments (1 to 2 hours) that destruction of the medulla or section of the vagi in the frog leads immediately to a permanent hypertonus or incomplete tetanus of the lung neuro-muscular mechanism, which makes the lung practically non-functional and useless as a respiratory organ. The present work however, was undertaken with the idea of ascertaining whether this hypertonic condition observed by these authors is permanent or temporary.

The Use Of Common Names For Plants, B. Shimek

Proceedings of the Iowa Academy of Science

A plea is frequently made by lovers or amateur students of plants for the use of so-called common (or vernacular) names for our species. Sometimes it is voiced also by secondary school teachers of botany, and last year it was included in one of the official reports of this Academy. The writer has received a number of written and verbal complaints aimed at the use of scientific names only, in papers treating of the plants of our state, and every other botanist in the state undoubtedly has had similar experience. In view of these circumstances it seems worthwhile to note …

The Genus Ceanothus L. In Iowa, B. Shimek

Proceedings of the Iowa Academy of Science

The low shrubs known as New Jersey Tea, belonging to the Genus Ceanothus, were once very abundant throughout Iowa, occurring chiefly on the prairies, and sometimes in dry, open woods and along the borders of drier thickets. On account of their long, tough roots they interfered with the breaking of the prairie, and the commoner species, C. americanus, known as "shoestring" or "red-root," was by no means popular with the pioneers. Perhaps for this reason, and because they were so common, these attractive shrubs were seldom cultivated in this state.

The Teaching Of Plant Pathology, L. H. Pammel

Proceedings of the Iowa Academy of Science

I am sorry that Doctor Melhus because of sickness is unable to be with you to present the subject of plant pathology from the standpoint of a special teacher. I have not had time to get a paper ready for you and what I shall say will be entirely informal and not necessarily a connected discourse. In recent years I have given little attention to the subject of plant pathology at Ames, feeling it is in good hands. During my early career at Ames I had some experience in giving some training to students in this subject.

Studies On The Germination Of Some Woody Plants, L. H. Pammel, C. M. King

Proceedings of the Iowa Academy of Science

The following brief study is a continuation of those previously reported to the academy. In the past these papers have been published in the Report of the Academy. One paper is in the hands of the Secretary. It is hoped to finally report on the germination of all of the native woody plants of Iowa, as well as the germination of a few exotics. In a study of the germination of these plants one is apt to notice striking characters that cannot well be described. For instance, the young dogwood plants have an aspect peculiar to the family. For the …

Alcohols As Factors Altering Fatigue Processes In Frog Muscle, Francis Marsh Baldwin

Proceedings of the Iowa Academy of Science

In a recent paper experiments were cited which indicate that developing sea-urchin eggs when subjected to suitable concentrations of various liquid-soluble substances, i.e., the higher alcohols, show unmistakable rhythms of susceptibility and resistance according to the phase of physiological activity at the specific time of treatment. Such observations constitute additional evidence that a very intimate relation or correlation exists between the general physiological condition of the egg, and the physical state of its plasma-membrane. The present paper is a preliminary report of experiments conducted in the light of recent advances to analyze the effects of various concentrations of the alcohols …

Studies Of The Phycomycetes Of Iowa, J. M. Raeder

Proceedings of the Iowa Academy of Science

Numerous papers and valuable collections of the Fungus Flora of the state have been contributed by earlier botanists. Due to the effort of such men as Halsted, Bessey, Arthur, Hitchcock, Holway and Pammel, a collection of over 200,000 specimens of the fungi of the state is assembled in the herbarium of Iowa State College and other prominent herbaria in America. These collections are listed and described in various papers which are scattered in numerous publications over a period of a half century. It is obvious, then, that in order that such material be of value to students of mycology, it …

Index

Proceedings of the Iowa Academy of Science

No abstract provided.

Fall Term Commencement [Program], November 30, 1920, 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, V4n4, October 1, 1920, Iowa State Teachers College

The Alumni News Letter

Contains news of the College and its alumni.

Summer Term Commencement [Program], August 19, 1920, 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 News Letter [V4n3], July 1, 1920, Iowa State Teachers College

The Alumni News Letter

Contains news of the College and its alumni.

The Alumni News Letter, V4n3, July 1, 1920, Iowa State Teachers College

The Alumni News Letter

Contains news of the College and its alumni.

Spring Term Commencement [Program], June 1, 1920, 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 1920, Iowa State Teachers College

UNI Programs and Courses Catalogs

Table of Contents

Calendar for 1920-1921 ... 3
Officers of Administration and Instruction ... 4
General Information ... 30
Residence, Student Health, Assembly ... 34
Expenses and Fees ... 35
Free Scholarships ... 37
Extension Service ... 37
Acceptance of Credits from Other Institutions ... 37
College Organizations ... 38
Faculty Organizations ... 39
Training in Actual Teaching ... 39
Public Lectures and Entertainments ... 39
Boarding and Lodging ... 40
Employment of Students ... 41
Twelve Weeks Normal Training ... 41
School Credits in Lieu of Certificate Examinations ... 41
Examinations for Teachers Certificates ... 42
Department Certificates ... …

The Alumni News Letter, V4n2, April 1, 1920, Iowa State Teachers College

The Alumni News Letter

Contains news of the College and its alumni.

Winter Term Commencement [Program], March 9, 1920, 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 Localization Of Sound By Wave Phase In The Open Ear, Henry M. Halverson

Proceedings of the Iowa Academy of Science

Wave phase localization may be studied under normal conditions; ie, without the aid of conductors to the ears. Our apparatus consists of two telephone receivers connected in series from the same source. If the receivers are so energized as to produce a pure tone, the observer, by closing one ear and moving the head carefully from one source to the other, (the side of the head parallel to the axis of the receivers) will experience a series of "highs" and "lows" in intensity. These points of maximum and minimum intensity correspond exactly to the points of reinforcement and interference as …

What Constitutes Voice?, C. I. Erickson

Proceedings of the Iowa Academy of Science

General mechanism of voice production.