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Condensations With Alkylene Bromides, H. F. Lewis, Charles Fordyce Jan 1925

Condensations With Alkylene Bromides, H. F. Lewis, Charles Fordyce

Proceedings of the Iowa Academy of Science

Various butylene bromides were condensed with aniline and the products of reaction studied. Among the products were the corresponding butylenes, the substituted diphenyl-ethylene-diamines and other products of unknown composition. The report given was merely a preliminary report. Other aromatic amines were used, notably the 1-aminoanthraquinone and the 2-aminoanthraqumone.

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Conductance In Liquid Hydrogen Sulfide Solutions, G. N. Quam, J. A. Wilkinson Jan 1925

Conductance In Liquid Hydrogen Sulfide Solutions, G. N. Quam, J. A. Wilkinson

Proceedings of the Iowa Academy of Science

Hydrogen sulfide has been found to act more like an organic solvent than as an inorganic one in the character of the substances that are soluble in it. As a result, most of its solutions are nonconductors, but it has been found that the halides of the phosphorous family do conduct, with the exception of bismuth which forms an insoluble compound with the hydrogen sulfide. With the other elements of the family the amount of conductance increases with the atomic weight of the element, the antimony chloride being of the order of 10,000 times that of the phosphorus.

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Some Soil And Moisture Relationships Of Sweet Gum And River Birch In Southern Maryland, F. B. Trenk Jan 1925

Some Soil And Moisture Relationships Of Sweet Gum And River Birch In Southern Maryland, F. B. Trenk

Proceedings of the Iowa Academy of Science

While engaged during the late summer of 1924 in the gathering of data for yield tables in stands of sweet gum (Liquidambar stryaciflua L.) and river birch (Betula nigra L.), in one of the southern counties of Maryland, the attention of the writer was attracted to the striking occurrence of pure stands of these species on adjacent tracts of land, with no apparent cause for the sharp line of demarcation between the two types of forest. Suspecting that some difference in soil structure or soil moisture, or possibly both, might offer an explanation for this rather …

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Germination Of Some Pines And Other Trees, L. H. Pammel, C. M. King Jan 1925

Germination Of Some Pines And Other Trees, L. H. Pammel, C. M. King

Proceedings of the Iowa Academy of Science

In 1917 the authors began a study of the germination of trees and shrubs native to Iowa, for the purpose of extending our knowledge of the life history of some of our common woody plants. In scanning the literature we found that writings upon the early and juvenile forms of shrubby plants native to Iowa very scant. In succeeding papers we extended the study to include species of other sections of the country as well as a few exotic genera.

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Optical Constants Of Single Crystal Bismuth, L. H. Rowse Jan 1925

Optical Constants Of Single Crystal Bismuth, L. H. Rowse

Proceedings of the Iowa Academy of Science

The index of refraction and extinction index of bismuth for a ray reflected from a natural cleavage surface (perpendicular to main crystallographic axis) are measured by means of a Stokes' analyser. The values so obtained are compared with the values for the polycrystalline metal.

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Proceedings Of The Thirty-Ninth Annual Meeting Of The Iowa Academy Of Science, Held At Cedar Falls, May 1-2, 1925: Minutes Of The Meeting; Staff & Committee Reports Jan 1925

Proceedings Of The Thirty-Ninth Annual Meeting Of The Iowa Academy Of Science, Held At Cedar Falls, May 1-2, 1925: Minutes Of The Meeting; Staff & Committee Reports

Proceedings of the Iowa Academy of Science

No abstract provided.

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Economical Filtration In Deep X-Ray Therapy, Scott W. Smith Jr. Jan 1925

Economical Filtration In Deep X-Ray Therapy, Scott W. Smith Jr.

Proceedings of the Iowa Academy of Science

A problem in deep x-ray therapy is to deliver to a deep seated malignant tumor, a sufficiently large dose of x-rays to affect the malignancy without permanent injury to the skin and intervening tissue. To accomplish this it is necessary to obtain a very penetrating beam of x-rays.

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Title Page - Front Matter Jan 1925

Title Page - Front Matter

Proceedings of the Iowa Academy of Science

No abstract provided.

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Hydrogen Sulphide Production By Bacteria, Frederick W. Mulsow, Frederick S. Paine Jan 1925

Hydrogen Sulphide Production By Bacteria, Frederick W. Mulsow, Frederick S. Paine

Proceedings of the Iowa Academy of Science

There are some conflicting reports, in the investigation that has been reported, of the ability of different organisms to evolve hydrogen sulphide from various sulphur-containing compounds. One report quite at variance with a majority of others is that of Tanner (1917) who has reported more exhaustive investigation than any other worker, unless it be Sasaki and Otsuka 2 (1912). Tanner, using four per cent of peptone, brand not stated, reports several organisms as producing hydrogen sulphide that other investigators report as negative. Among these are B. paratyphosus A, B. dysentery, B. aerogenes, and Staphyloccus albus. Much of the variation reported, …

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Teaching The Elementary Course In Bacteriology, R. E. Buchanan Jan 1925

Teaching The Elementary Course In Bacteriology, R. E. Buchanan

Proceedings of the Iowa Academy of Science

The objectives to be emphasized in courses in bacteriology in the probable order of importance for the elementary course are: A. Vocational Practical Utilization in vocation. B. Health. With some student groups rank first. C. Citizenship. Social-Civic. D. Avocationa. Of minor importance in bacteriology in most cases.

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Notes On Iowa Fungi - 1924, G. W. Martin Jan 1925

Notes On Iowa Fungi - 1924, G. W. Martin

Proceedings of the Iowa Academy of Science

Resting spores of Empusa muscae, the so-called "fly cholera" fungus, were described in 1881 by Winter from Germany. Since then they have been diligently sought for by a number of competent investigators, but were not again reported until 1923, when Miss Goldstein described them as occurring abundantly on house flies in the vicinity of New York. The latter author regards them as true chlamydospores, formed under dry conditions after.conidial discharge has ceased to be possible, and apparently found them only on old flies which had long ceased to di charge conidia. She found the resting spores to be thick …

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Vanadium Oxytrichloride As A Solvent, F. E. Brown, J. E. Snyder Jan 1925

Vanadium Oxytrichloride As A Solvent, F. E. Brown, J. E. Snyder

Proceedings of the Iowa Academy of Science

Vanadium oxytrichloride is a liquid from below -15° to about 125°. This is an excellent range for a solvent. The liquid is light yellow in color and has a density of about 1.8. It is easily hydrolyzed. The solubilities of about 80 substances have been determined. No inorganic compound is more than very sparingly soluble in vanadium oxytrichloride. Elements of the chlorine and sulfur families are soluble. Most organic compounds are readily soluble.

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Quantitative Measurements In The Transmission In Solid Acoustic Wave Filters With Varying Physical Dimensions, H. F. Olson Jan 1925

Quantitative Measurements In The Transmission In Solid Acoustic Wave Filters With Varying Physical Dimensions, H. F. Olson

Proceedings of the Iowa Academy of Science

The object of these experiments was to test the transmission of solid acoustic wave filters with the view to the establishment of empirical formulas to be used in future designs. The length of sections, the conductivity into the branch lines, and the volume of the branch lines were altered in the case of low-frequency-pass-filters. In all cases the variations produced effects that are analogous to those found with acoustic wave filters in fluids. But more than this, so far as a test has been made, the cut-off frequency is in agreement with the Stewart theory for fluids. This means that …

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Some Additional Observations On Sphenodon Punctatum In Captivity, Warren N. Keck Jan 1925

Some Additional Observations On Sphenodon Punctatum In Captivity, Warren N. Keck

Proceedings of the Iowa Academy of Science

In the Proceedings of the Iowa Academy of Science, Vol. XXX, 1925, pp. 151-115, appeared an article by Wendell Krull on certain habits of Sphenodon punctatum which be observed about this animal in captivity. Since September, 1924, the writer has been caring for two of the same specimens upon which Mr. Krull made his observations. The reptiles have been kept under exactly the same conditions as those under which Mr. Krull made his observations so that any changes in habits are not due to changes of conditions. While most of my observations and notes coincide very well with Mr. Krull's, …

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Certain Body Temperature Changes In The Snapping And Painted Turtles, F. M. Baldwin Jan 1925

Certain Body Temperature Changes In The Snapping And Painted Turtles, F. M. Baldwin

Proceedings of the Iowa Academy of Science

Experiments performed at Iowa Lakeside Laboratory during the past summer indicate that both forms show fluctuations of from 3 to 6 degrees F. in the so-called non-critical ranges of their environment (50-80 degrees F.). When subjected to a rapid environmental drop the rectal readings show a somewhat greater lag than when cooled more slowly. In both procedures a check in drop is noted at about 40 degrees F. (4.5 degrees C.) and there is maintained for a considerable interval of time.

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Chromosome Studies Of Zea Mays L., R. G. Reeves Jan 1925

Chromosome Studies Of Zea Mays L., R. G. Reeves

Proceedings of the Iowa Academy of Science

Kuwada (1911, 1915, 1919) was the first investigator who did extensive work on the cytology of maize. He states that the number of bivalent chromosomes varies in different varieties, in different plants of the same variety, and even in different cells of the same plant. In each variety one number is much more prevalent than any other, and this number varies from nine to twelve in the different varieties which he studied. He concludes that twelve is the most frequent number of bivalent chromosomes in most varieties of sweet corn.

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Some Wound Responses Of Citrus Leaves, Robert B. Wylie Jan 1925

Some Wound Responses Of Citrus Leaves, Robert B. Wylie

Proceedings of the Iowa Academy of Science

The general wound response of the foliar organs of Citrus was studied using leaves of a large potted lemon tree. This plant stood at the southeast corner of a building, outdoors, during the experimental period and received full sunshine a large part of the day. Following wounding an interval of about ten days elapsed before there was a division of the living cells beneath the collapsed dead tissue. The cicatrice, which was not complete until the close of the third week following wounding consisted of eight to ten layers of cells.

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The Mississippian-Pennsylvanian And Pennsylvanian-Pleistocene Unconformities In Lucas County, Iowa, A. L. Lugn Jan 1925

The Mississippian-Pennsylvanian And Pennsylvanian-Pleistocene Unconformities In Lucas County, Iowa, A. L. Lugn

Proceedings of the Iowa Academy of Science

The object of this paper is to make accessible quantitative data on the magnitude of the Mississippian- Pennsylvanian and Pennsylvanian-Pleistocene unconformities in south-central Iowa. This data is here presented by permission of the State Geologist, Dr. G. F. Kay.

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Molding Sand In Eastern Iowa, John E. Smith Jan 1925

Molding Sand In Eastern Iowa, John E. Smith

Proceedings of the Iowa Academy of Science

Molding sand is found on and near the bluffs east and southeast of the larger stream valleys or of large curves in these valleys. It is also found on the upland in interstream areas in Benton, Cedar and in a few other counties. It occurs chiefly in deposits believed to be eolian and some of these are in the form of ancient dunes now covered with soil. Part of the molding sand in some of these old dunes is a residual mixture.

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A Phenomenon In Vision Similar To Refractory Phase, Roland C. Travis Jan 1925

A Phenomenon In Vision Similar To Refractory Phase, Roland C. Travis

Proceedings of the Iowa Academy of Science

It has been found that under conditions of dark adaptation, there exists a rather definite relationship between the three variables, the intensity of the stimulus, dark adaptation, and a visual phenomenon similar to refractory phase of spinal reflexes. Three experiments were made in ascertaining this relationship.

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Iowa Placement Examinations, George D. Stoddard Jan 1925

Iowa Placement Examinations, George D. Stoddard

Proceedings of the Iowa Academy of Science

The Iowa Placement Examinations in English, French, chemistry, and mathematics are designed primarily for entering college students. Each examination appears in two series: an Aptitude Examination which measures specific capacity in the various branches, and a Training Examination which measures objectively previous performances in the subject. Each examination was prepared through cooperation of the Psychology Department and the Department represented by the specific subject. Their primary purpose is to provide an adequate criterion for the sectioning of classes on the basis of ability.

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Temporal Precision In Motor Rhythm, Robert Holmes Seashore Jan 1925

Temporal Precision In Motor Rhythm, Robert Holmes Seashore

Proceedings of the Iowa Academy of Science

The object of this research in motor rhythm is two-fold; (1) the analysis and comparison of factors involved in rhythmic perception and action by means of a battery of 12 psychophysical tests, whose results are treated statistically and individually, and (2) the development amd standardization of a new test for temporal accuracy in motor rhythm, which may be used in conjunction with present measures of musical talent. A graphic record of an observer's tapping in time with a recurrent rhythm pattern is obtained by means of a phonograph chronograph, and is then measured for regularity. In contrast to numerous very …

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The Protein Requirements Of Practically Mature Fattening Cattle, C. C. Culbertson, John M. Evvard Jan 1925

The Protein Requirements Of Practically Mature Fattening Cattle, C. C. Culbertson, John M. Evvard

Proceedings of the Iowa Academy of Science

A number of tests have been carried on at the Iowa Agricultural Experiment Station with fattening two-year-old steers. These steers have been fed during the fall and winter months in dry lot, usually for 120 days.

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The Influence Of Carbon Dioxide Upon The Quality And Keeping Properties Of Butter And Ice Cream, F. F. Sherwood Jan 1925

The Influence Of Carbon Dioxide Upon The Quality And Keeping Properties Of Butter And Ice Cream, F. F. Sherwood

Proceedings of the Iowa Academy of Science

It is quite generally believed that oxygen of the air enclosed in butter and ice cream is responsible for some of the undesirable changes taking place. If it were true that appreciable oxidation takes place due to the presence of oxygen in the enclosed air, it would be very desirable to replace the air with some other gas. Recently attempts have been made to replace the air normally incorporated in butter and ice cream by carbon dioxide gas. The work herein reported represents an attempt to determine the influence of carbon dioxide upon the quality and keeping properties of butter …

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An Unusual Oölite Near Hayfield, Frederick County, Virginia, A. S. Furcron Jan 1925

An Unusual Oölite Near Hayfield, Frederick County, Virginia, A. S. Furcron

Proceedings of the Iowa Academy of Science

A microscopic study of this peculiar sediment has been made from two small specimens sent to the author by Dr. A. W. Giles of the University of Virginia. The samples were collected from the base of the Romney formation of Devonian age. The rock is dark, compact and fine textured consisting of angular grains of quartz and flattened oölites usually less than one millimeter in diameter.

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Sedimentary Processes On Volcanic Islands, Chester K. Wentworth Jan 1925

Sedimentary Processes On Volcanic Islands, Chester K. Wentworth

Proceedings of the Iowa Academy of Science

The fundamental geologic structures of Hawaii are wholly igneous in origin. With the building of the volcanic piles up to wave base sedimentary processes commence and these are enormously augmented when volcanic accumulation reaches above the level of the sea. Nearly all the known sedimentary processes are exemplified.

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Objective Study Of Speed And Accuracy In Typing, Luton Ackerson Jan 1925

Objective Study Of Speed And Accuracy In Typing, Luton Ackerson

Proceedings of the Iowa Academy of Science

A preliminary report of an attempt to determine a valid criterion-measure of speed and accuracy in typing practice among high school pupils.

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The Occurrence Of Hickories In Iowa In Relation To Soil Types, Fred B. Trenk Jan 1925

The Occurrence Of Hickories In Iowa In Relation To Soil Types, Fred B. Trenk

Proceedings of the Iowa Academy of Science

The data of ecology reveals a very close relationship between soil types and the species of plant which will be normally found on them. Silviculturists have lately applied methods of ecology quite intensively to a study of the habits and associations of trees, and in these studies the physical and chemical properties of soils occupy a position of prominence. Silviculturists recognize some ten or twelve ecological factors influencing the occurrence and distribution of sylva. These are quite commonly known to foresters as the "Silvicultural Characteristics of Trees." Among the most important of these factors is the one of soil quality.

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Culture Studies Of Psilocybe Coprophila, Katherine Gilmore Jan 1925

Culture Studies Of Psilocybe Coprophila, Katherine Gilmore

Proceedings of the Iowa Academy of Science

Psilocybe coprophila, Fr. has been investigated. It is found to be a heterothallic species producing two strains of primary rnycelium, the union of which is necessary to the production of a secondary mycelum with clamp connections, or of basidiocarps. The capacity for the formation of certain abnormalities of the pileus is inherent in some strains and transmitted from generation to generation.

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The Action Of Certain Oxidizing Agents In Sulfite And Its Determination, W. S. Hendrixson Jan 1925

The Action Of Certain Oxidizing Agents In Sulfite And Its Determination, W. S. Hendrixson

Proceedings of the Iowa Academy of Science

The oxidation of sulfite in acid solution by dichromate, bromate and permanganate was found to be incomplete, the oxidant used being several per cent short of that required in each case to change sulfite ion completely into sulfate ion. This is probably clue to the formation of dithionate, which is not further oxidized. Iodate behaves very differently.

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