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Transient Aphasia As A Common Element In Speech And Reading Defects, Geo. A. Kelly Jan 1931

Transient Aphasia As A Common Element In Speech And Reading Defects, Geo. A. Kelly

Proceedings of the Iowa Academy of Science

Transient aphasia characterizes mental fatigue. It was thought that it might also characterize those individuals whose rate and comprehension in silent reading is low in comparison with their intelligence. A test was devised which required a series of equivalent mental operations at two-second intervals, in order to reveal momentary aphasic periods. College freshmen whose rate and comprehension in silent reading was below the average for their level of intelligence failed to perform 20% of the operations; those whose reading scores were consistent with their intelligence failed to perform 11.9% of the operations and those whose reading scores were high in …

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Basic Differences In Pitch, Intensity, And Time Between Good And Poor Voices During Speech, Elwood Murray, Joseph Tiffin Jan 1931

Basic Differences In Pitch, Intensity, And Time Between Good And Poor Voices During Speech, Elwood Murray, Joseph Tiffin

Proceedings of the Iowa Academy of Science

This investigation involves the photography of pitch, intensity, and duration changes in about 80 poor speaking voices and 60 good speaking voices to ascertain basic differences that will indicate procedures for remedial purposes. The voices studied were the best and the poorest among 970 freshmen at the University of Iowa as rated and described by speech pathologists of the university staff. By means of a procedure worked out by Tiffin and others, a synonymous intensity, a pitch, and duration record of each syllable is photographed on a single strip of sensitized paper six inches wide.

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Bilateral Ovaries In Raptorial Birds, With Notes On Kidney Structure, F. L. Fitzpatrick Jan 1931

Bilateral Ovaries In Raptorial Birds, With Notes On Kidney Structure, F. L. Fitzpatrick

Proceedings of the Iowa Academy of Science

Zoological textbooks generally state that right and left ovaries develop in the embryonic bird, but that only the left ovary persists in the majority of adults.

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Personal Attitudes Of Delinquent Boys In Iowa, J. L. Reusser Jan 1931

Personal Attitudes Of Delinquent Boys In Iowa, J. L. Reusser

Proceedings of the Iowa Academy of Science

A test of Personal Attitudes by Sweet was given to 423 delinquent boys in the Iowa Training School at Eldora, and to 419 public school boys of approximately the same age and grade. The attitudes measured are Self-Criticism, Criticism of the Average Boy, Feeling of Difference, Feeling of Superiority and Inferiority, Deviation from the Group Idea of the Right, and Social Insight. The delinquent boys were found to be more critical of the average boy, to feel themselves nearer to the ideal than most boys, to have less insight into the feelings of boys in general, than the non-delinquent.

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Two New Infusoria (Protozoa) From Iowa, Robert L. King Jan 1931

Two New Infusoria (Protozoa) From Iowa, Robert L. King

Proceedings of the Iowa Academy of Science

Test truncated pyriform, widest at the base where it is fixed by a short stalk, truncated at the apical end where there is a definite, free, lip-like border; circular in cross section. Three or four corrugations at the widest part of the base. Body oval or spherical fastened to the base of the test, usually protruding from the test but not completely filling it. Tentacles slightly knobbed, numerous, scattered over the protruding surface of the body. Macronucleus central, oval; micronucleus not observed. One, two or three contractile vacuoles, requiring 12-20 minutes at 22° C. for a complete cycle.

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Retrogressive Changes In The Ovaries Of Rana Clamitans Tadpoles Following X-Ray Treatment, William T. Levine Jan 1931

Retrogressive Changes In The Ovaries Of Rana Clamitans Tadpoles Following X-Ray Treatment, William T. Levine

Proceedings of the Iowa Academy of Science

The ovaries of Rana clamitans larvae show marked degenerative changes after x-ray treatment with lethal doses. These animals live from three to four weeks after exposure and death is usually accompanied by characteristic pathological changes in the epidermis and viscera. The ovary becomes smaller and in young animals its further development is arrested. The oogonia are most resistant to x-rays and exhibit very little change but the growing young eggs are completely disintegrated probably by changes in their chemical composition. The larger auxocytes also degenerate by a process of vacuolization and finally appear as cells of a fibrous skeletal structure. …

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Nitrate Assimilation By Soil Bacteria, F. B. Smith, Dorothy Schlots Jan 1931

Nitrate Assimilation By Soil Bacteria, F. B. Smith, Dorothy Schlots

Proceedings of the Iowa Academy of Science

It has long been known that straw or strawy manure when added to the soil may bring about a reduction in the nitrate content of the soil due to a stimulation of certain biological processes. The conclusion has been drawn that the nitrate may disappear as a result of denitrification, nitrate reduction or nitrate assimilation.

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Anaerobic Nitrogen Fixation In Some Iowa Soils, W. Hillman Willis, R. H. Walker Jan 1931

Anaerobic Nitrogen Fixation In Some Iowa Soils, W. Hillman Willis, R. H. Walker

Proceedings of the Iowa Academy of Science

Data secured by various investigators have proven quite conclusively that the aerobic nitrogen-fixing bacteria of the genus Azotobacter are not active or even present in soils more acid than pH 6.0. Many of the soils in Iowa are more strongly acid than this, and while no Azotobacter have been found in them, some nitrogen fixation certainly occurs. It appears, therefore, that some other organisms or groups of organisms must be responsible.

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A Few Records Of Birds Infrequently Seen In Southeastern Iowa, H. E. Jaques, Pete Parks Jan 1931

A Few Records Of Birds Infrequently Seen In Southeastern Iowa, H. E. Jaques, Pete Parks

Proceedings of the Iowa Academy of Science

The following few bird notes are based on observations sufficiently rare that it seems they should be permanently recorded in the biological literature of the state.

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Late Fall And Winter Bird Records, 1926 To 1930, In The Upper Missouri Valley, Wm. Youngworth Jan 1931

Late Fall And Winter Bird Records, 1926 To 1930, In The Upper Missouri Valley, Wm. Youngworth

Proceedings of the Iowa Academy of Science

These records are intended to be a continuation of the winter bird lists of the Upper Missouri Valley, started in 1916 by Dr. T. C. Stephens, of Morningside College. Later Mr. Charles J. Spiker, of New Hampton, Iowa, published the winter records from 1922 to 1926, and the present paper begins at the latter year.

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Residual Effects Of Some Germicides Used In Sterilizing Legume Seeds, Dean A. Anderson, R. H. Walker Jan 1931

Residual Effects Of Some Germicides Used In Sterilizing Legume Seeds, Dean A. Anderson, R. H. Walker

Proceedings of the Iowa Academy of Science

In legume inoculation studies mercuric chloride is frequently used as a germicidal agent for sterilizing the legume seeds. While it is an effective disinfectant its use is often attended with objectionable results because of failure to remove all of the mercuric chloride from the seeds with the result that organisms surrounding the seeds may be killed thus preventing inoculation. In the course of some recent legume inoculation studies this difficulty became very apparent and as a result the extent of the toxic effect was investigated.

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Experiments With Dry Dust Cultures For The Inoculation Of Legume Seeds, R. H. Walker, G. B. Killinger Jan 1931

Experiments With Dry Dust Cultures For The Inoculation Of Legume Seeds, R. H. Walker, G. B. Killinger

Proceedings of the Iowa Academy of Science

Within the past few years a number of commercial concerns have produced a dry dust type of culture for the inoculation of legume seeds. Field experiments have been conducted to test the value of these cultures for the inoculation of soybeans. The results showed that the dry dust cultures did not give satisfactory inoculation. Greenhouse experiments have also shown that the inoculation of legume seeds sometime in advance of the planting date, as is recommended by the producers of the dry dust manufacturers, is undesirable.

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Officers, Past Presidents, And Members, Iowa Academy Of Science Jan 1931

Officers, Past Presidents, And Members, Iowa Academy Of Science

Proceedings of the Iowa Academy of Science

No abstract provided.

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Fertility Variations In Tetraploid Tomatoes With Different Genetic Origins, E. W. Lindstrom Jan 1931

Fertility Variations In Tetraploid Tomatoes With Different Genetic Origins, E. W. Lindstrom

Proceedings of the Iowa Academy of Science

By a very simple technique it has become possible to double the chromosome number of the tomato plant practically at will. Tetraploid forms thus derived are affording critical opportunities to ascertain the fundamental relation between chromosomes and hereditary characters, especially characters involving fertility (or sterility) of flower and fruit.

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Some Recent Contributions To Our Understanding Of Corn Diseases, I. E. Melhus Jan 1931

Some Recent Contributions To Our Understanding Of Corn Diseases, I. E. Melhus

Proceedings of the Iowa Academy of Science

There is probably no other disease problem of greater significance economically than that of corn. Hence, the purpose of this paper is to sketch briefly the progress that has been made in this study and to point, in a general way, to some phases of the problem that are immediately before us. Because of its complexity and the misconception as to its significance, a beginning in this field was tardy. Our method of attack on the corn problem seems to be passing through the characteristic successive stages of investigation. These stages may be traced as beginning with observation of the …

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Title Page - Front Matter Jan 1931

Title Page - Front Matter

Proceedings of the Iowa Academy of Science

No abstract provided.

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Linear Order Of Four Genes On The First Chromosome Of The Tomato, E. W. Lindstrom Jan 1931

Linear Order Of Four Genes On The First Chromosome Of The Tomato, E. W. Lindstrom

Proceedings of the Iowa Academy of Science

Genetic tests for linkage have shown that four pairs of hereditary factors belong on the first chromosome of the tomato. They are: 1. Tall - dwarf growth habit. Genes Dd. 2. Smooth- peach (pubescent) fruit. Genes Pp. 3. Oblate (or round) - ovate fruit shape. Major genes Oo. 4. Simple- compound flower cluster. Genes Ss.

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Water Softening By Base Exchange, Edward Bartow Jan 1931

Water Softening By Base Exchange, Edward Bartow

Proceedings of the Iowa Academy of Science

According to a map of the United States on which the hardness of water is shown, Iowa is one of nine states which are classed as having the hardest water. The states besides Iowa are Florida, Indiana, Illinois, South Dakota, Nebraska, Kansas, Oklahoma, and Arizona. These states for the most part are the best agricultural states. The hard water, however, makes them less desirable as places of residence.

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The Micro-Climate Of Zea Mays In Central Iowa, J. M. Aikman Jan 1931

The Micro-Climate Of Zea Mays In Central Iowa, J. M. Aikman

Proceedings of the Iowa Academy of Science

During the past two years a project on the ecology of Zea mays has been carried on in an attempt to study the corn plant under average field conditions in Central Iowa. Important activities of the plant were followed throughout the growing season to establish the trend, in order that deviations caused by measured habitat factors could be evaluated.

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Quantitative Analysis Of Lettuce Ash, Louise Wendt, John A. Wilkinson Jan 1931

Quantitative Analysis Of Lettuce Ash, Louise Wendt, John A. Wilkinson

Proceedings of the Iowa Academy of Science

As early as 1864 Wolff brought out the need for a systematic tabulation of plant ash analyses and in his book published the best data available at that time. He reported CaO, MgO, K20, Na2O, Fe2O3 , PO3 , SO3 , SiO2 and Cl. But he gave neither the number of analyses nor the source of the samples. Similar data are given by both Leach and Sherman.

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A Comparative Morphological Study Of Certain Species Of The Dacryomycetaceae, Marian C. Fisher Jan 1931

A Comparative Morphological Study Of Certain Species Of The Dacryomycetaceae, Marian C. Fisher

Proceedings of the Iowa Academy of Science

The family Dacryomycetaceae is here regarded as belonging to the Tremellales. Members of this family are common, occurring on dead wood. They are dull and inconspicuous when dry, but when moist they are brightly colored and more noticeable. The fructifications range in size from that of a pin-head up to dimensions of several centimeters, and in shape from broadly effused through pulvinate and resupinate to upright forms which may be stalked and capitate, cupulate, spathulate or awl-shaped. They may or may not be rooted in the substratum. The consistence varies from soft gelatinous to sub-cartilaginous. Because of their wood rotting …

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Flowering Plants Of Black Hawk County, Iowa, Myrle Marie Juliana Burk Jan 1931

Flowering Plants Of Black Hawk County, Iowa, Myrle Marie Juliana Burk

Proceedings of the Iowa Academy of Science

In Black Hawk County, Iowa, the rolling prairies of Iowan drift, the valley of the Red Cedar River, varying in its physiographic features from loess bluffs to low sandy flood plains with numerous "lakes" and swamps, remnants of old oxbows, and the valley of the Wapsipinicon River which are favorable to the development of several types of plant associations, present a rich flora.

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The Solubility Of Certain Substituted Benzoic Acids In Typical Salt Solutions At 25°, J. N. Pearce, J. W. Newsome Jan 1931

The Solubility Of Certain Substituted Benzoic Acids In Typical Salt Solutions At 25°, J. N. Pearce, J. W. Newsome

Proceedings of the Iowa Academy of Science

The solubility of the ortho-, meta- and para aminobenzoic acids, of the ortho-, meta- and para hydroxybenzoic acids, and of ortho- and meta nitrobenzoic acids in typical salts solutions at 25° has been determined. The salts were sodium chloride, barium chloride, potassium sulphate and magnesium sulphate.

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A Quantitative Spectrographic Study Of Magnesium Contamination In Calcium Oxalate Precipitates, D. C. Mccann, Louis Waldbauer, Stephen Popoff Jan 1931

A Quantitative Spectrographic Study Of Magnesium Contamination In Calcium Oxalate Precipitates, D. C. Mccann, Louis Waldbauer, Stephen Popoff

Proceedings of the Iowa Academy of Science

Chemists have attempted quantitative spectrographic analysis repeatedly since 1863 when Miller first conducted his experiments. De Gramont added considerable information in a series of papers of about 1907. Leonard and Pollock, and Hartley also published much material about the same time. These methods depend on comparison with a standard of the same composition, containing the same elements. Gerlack and Schweitzer have recently developed a system which depends on comparison with lines of some other element which occur very nearby. The method used in our determinations is based on the earlier work.

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The Vapor Pressures Of Aqueous Solutions Of Lithium Nitrate At 25°, J. N. Pearce, A. F. Nelson Jan 1931

The Vapor Pressures Of Aqueous Solutions Of Lithium Nitrate At 25°, J. N. Pearce, A. F. Nelson

Proceedings of the Iowa Academy of Science

The vapor pressures of aqueous solutions of lithium nitrate at 25° have been measured by the dynamic method for concentrations ranging from 0.1 M up to saturation. From the data obtained has been calculated the activity of the solute and solvent. The activity coefficients of the salt were calculated by means of the "h" function of Lewis and Randall. The free energy of dilution has been calculated. The activity coefficients show a minimum at about 0.6 M. The same thermodynamic properties for aqueous solutions of potassium chloride, potassium iodide and sodium bromide have been recalculated and compared.

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Some Physical Properties Of Aqueous Salt Solutions, J. N. Pearce, M. A. Hooper Jan 1931

Some Physical Properties Of Aqueous Salt Solutions, J. N. Pearce, M. A. Hooper

Proceedings of the Iowa Academy of Science

The refractive indices of solutions of the alkali halides and nitrates were determined at 25 ° and from these the specific refractivities of both the solution and solute were calculated by means of the Lorenz-Lorentz formula. From density data the partial molal volumes were also calculated. The dielectric constants of the solutions were calculated by means of the Huckel relation involving the refractive index and were found to decrease with increase in concentration, the values for all salts approaching the same small value at saturation. The activities were calculated according to the equation given by Huckel for concentrated solutions of …

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Platinum-Cadmium Alloys, K. W. Ray Jan 1931

Platinum-Cadmium Alloys, K. W. Ray

Proceedings of the Iowa Academy of Science

Platinum-cadmium alloys containing as high as 50 per cent platinum have been prepared by heating the two metals together. Solid platinum dissolves in hot molten cadmium to form a series of alloys, the melting points of which are relatively low. The thermal diagram of a portion of the system has been investigated by means of thermal analysis, microscopic study and X-ray examination. Two intermetallic compounds are formed, Pt2Cd9 and PtCd2. The compound Pt2Cd9 decomposes at a temperature of 615 into cadmium and PtCd2. The compound PtCd2 melts at 725°C. Pt …

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Some Rearrangement Reactions Of Organosodium And Organolithium Compounds, Henry Gilman, Fritz W. Breuer Jan 1931

Some Rearrangement Reactions Of Organosodium And Organolithium Compounds, Henry Gilman, Fritz W. Breuer

Proceedings of the Iowa Academy of Science

In continuation of rearrangement reactions of organometallic compounds, it was desirable to ascertain whether R-Metal combinations (free of halogen or other acidic groups) would react after the manner of benzylmagnesium chloride types with compounds like formaldehyde, for example. This last reaction gives not only the normal product (beta-phenylethyl alcohol), but also o-tolyl carbinol. It has been shown that the corresponding organosodium and organolithium compounds behave in a similar manner. Incidentally, it is possible to prepare some organolithium compounds, like phenyl-lithium, very conveniently, in a short time, and in excellent yields in the customary three-necked flasks.

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Organomagnesium Compounds Containing Solubilizing Amino Groups, Henry Gilman, Stanton A. Harris, Chuan Liu Jan 1931

Organomagnesium Compounds Containing Solubilizing Amino Groups, Henry Gilman, Stanton A. Harris, Chuan Liu

Proceedings of the Iowa Academy of Science

There is an uncommon demand, particularly in cancer and related studies, for organomagnesium compounds which contain amino groups to increase the solubility of products and also endow them with certain desirable physiological properties. With this in mind a series of Grignard reagents is being prepared, the members of which contain the -MgX group attached to carbon in a molecule having a basic group like -NR2 or in a substituted pyridine, quinoline, etc., grouping. Such RMgX compounds are formed from the corresponding RX compounds with somewhat less ease than from RX compounds having no basic grouping; however, they appear to …

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Science Bulletin, Vol.3 No.4, December 1930 [Complete Issue] Dec 1930

Science Bulletin, Vol.3 No.4, December 1930 [Complete Issue]

Science Bulletin

A Service Bulletin for Teachers of High School Science.

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