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Grass-Hopper Control Work In Iowa, H. E. Jaques
Grass-Hopper Control Work In Iowa, H. E. Jaques
Proceedings of the Iowa Academy of Science
Grass-hopper depredations to farm crops have been of frequent occurrence in Iowa, and figure to a certain extent in the loss account of almost every year in at least some part of the state. Attacks during the summer of 1918 seem to have been the most extensive of recent years. Early in June the young nymphs were seen in great numbers in many of the counties in the southwestern part of the state and a few weeks later they had reached the same stage in the southeastern part of the state. As this indicates, complaints of serious damage came first …
Notes On The Cercopidae With Descriptions Of Some New Species, E. D. Ball
Notes On The Cercopidae With Descriptions Of Some New Species, E. D. Ball
Proceedings of the Iowa Academy of Science
No additions have been made to the records of Iowa Cercopidae since the writer presented his papers on this group in 1895 and 1897; in fact, only one new species has been added to the United States list since that time. There have, however, been a number of rather surprising additions and extensions of distribution and some of them point to the probability of two more species being found in Iowa and the distribution of two others being extended beyond what appeared at that time to be their probable limits.
A Naturalist's Glimpse Of The Limberlost, Flora May Tuttle
A Naturalist's Glimpse Of The Limberlost, Flora May Tuttle
Proceedings of the Iowa Academy of Science
An errand combining business and pleasure carried me into the east-central part of Indiana, and so on my return I resolved to see the home of the gifted creator of Freckles, Laddie and the Girl of the Limberlost.
Study Of A Section Of The Oregon Coast Flora, Morton E. Peck
Study Of A Section Of The Oregon Coast Flora, Morton E. Peck
Proceedings of the Iowa Academy of Science
The following paper is the result of a somewhat detailed study of the flora of a small section of the Oregon coast in Lincoln County, namely, that lying between Yaquina Head and the mouth of Yachats River. These two points are distant from each other in a straight line about twenty-five miles; by the beach, striking across the mouths of the bays, the distant is perhaps twenty-eight miles. The flora in the neighborhood of Seal Rocks, about midway between the two points, received the most attention, though the whole ground was gone over rather carefully. This section is fairly representative …
Flora Of Mitchell County, Flora May Tuttle
Flora Of Mitchell County, Flora May Tuttle
Proceedings of the Iowa Academy of Science
From the time that I opened my eyes on the beauties of our glorious prairies, down in that little log cabin in Delaware County, I have been deeply interested in the flora of our state. Years ago the unbroken prairies were one gorgeous flower garden. The wild lily, the painted cup, fireweed, ironweed and blazing star vied with the golden glory of the sunflower and the golden rod. Some of these have so nearly become extinct that every bit of unbroken prairie is sacred ground.
A Herpetocrinus From The Silurian Of Iowa, A. O. Thomas
A Herpetocrinus From The Silurian Of Iowa, A. O. Thomas
Proceedings of the Iowa Academy of Science
Recently while the writer was sorting some collections which he and some of his students had gathered a few years ago at Monticello, he came upon a specimen of the rare crinoid Herpetocrinus. The specimen was almost wholly covered by the matrix and it was removed only after much patient cleaning. Further search among the material added three short pieces of stems while a drawer of specimens from the same locality, collected by Mr. J. V. Henley about 1907, contains a coiled stem labeled, "Crinoid stem, Monticello, Iowa, J. V. H." This, too, belongs to Herpetocrinus. As far as known, …
The Relation Between Voltage And Candle-Power In Modern Incandescent Lamps, William Kunerth
The Relation Between Voltage And Candle-Power In Modern Incandescent Lamps, William Kunerth
Proceedings of the Iowa Academy of Science
Among the operating characteristics of incandescent lamps, there are certain features which are often overlooked by the man using or dealing with lamps. The voltage is one of the chief factors upon which the behavior of a lamp depends. It is well known that under an excessive voltage, a lamp will not last long, but will last much longer than its normal life if the voltage is below normal. Mathematical formulae have been deduced from experimental results to cover this relation.
The History Of Boyer Valley, James H. Lees
The History Of Boyer Valley, James H. Lees
Proceedings of the Iowa Academy of Science
One of the largest streams of the Missouri slope in Iowa, and one of much importance in its influence on topography is Boyer River. This streams takes its rise in the Kansan uplands south of Storm Lake, flows a little east of south across Sac county past the town of Wall Lake where it turns abruptly southwest. In this direction it crosses Crawford County, which it divides into practically equal parts. In its course across Crawford county Boyer valley is of the normal mature type but in southern Sac there opens into the valley from the northeast a broad sag …
Notes On Conditions At The Head Of Flood Plains, John L. Tilton
Notes On Conditions At The Head Of Flood Plains, John L. Tilton
Proceedings of the Iowa Academy of Science
Flood plains are said to exist along the courses of rivers where in time of flood deposits are laid down on the flooded areas. Following such a flood plain up-stream the plain is said to become narrower till reduced to zero. In working along tributary ravines in Warren and Clarke Counties, Iowa, a different relation is noted that it appears to the writer should be emphasized.
The Genus Lactuca In Iowa, R. I. Cratty
The Genus Lactuca In Iowa, R. I. Cratty
Proceedings of the Iowa Academy of Science
The present paper on the genus Lactuca and its distribution in Iowa is the result of a study of this group of plants carried on at the Iowa State College during the past two years, supplemented by field work, and a visit to some of the other large herbaria in the state. The extensive collection of this genus in the State College herbarium, very largely the result of Doctor Pammel's work, has been freely used. To Dr. B. Shimek the author is indebted for the privilege of examining the Lactuca in the herbarium of the State University, and to Prof. …
Supplemental List Of Plants From Southeastern Alaska, J. P. Anderson
Supplemental List Of Plants From Southeastern Alaska, J. P. Anderson
Proceedings of the Iowa Academy of Science
The following list comprises plants that have been collected or determined during the past year. The larger portion of the species here enumerated is the result of a trip to Haines and Skagway at the head of Lynn Canal on August 19 to 21, 1918. Elevations are only approximate. The writer was told by well-informed residents of Skagway that the elevation of upper Lake Dewey was about 4,000 feet. All species for which this elevation is given were collected in the vicinity of the lake.
The Binaural Difference Of Phase Effect, G. W. Stewart
The Binaural Difference Of Phase Effect, G. W. Stewart
Proceedings of the Iowa Academy of Science
The binaural difference of phase effect has become of increased importance in recent years. The following are the new facts obtained in recent experiments which are still in progress.
Stratigraphic Delimitation Of St. Louis Formation, Charles Keyes
Stratigraphic Delimitation Of St. Louis Formation, Charles Keyes
Proceedings of the Iowa Academy of Science
Were it not for the fortunate circumstance that our early Carbonic section of the Mississippi Valley is already split up and its long recognized geographic title Mississippian Formation restricted in its application to a minor part more nearly coinciding with the original proposal of the name, it is probable that this familiar term would now have to give way to an older designation. In the sense of a sub-periodic title St. Louis, or Louisian, has precedence by many years over either Mississippi, or Mississippian.
An Illustration Of The Wedge-Work Of Roots, A. O. Thomas
An Illustration Of The Wedge-Work Of Roots, A. O. Thomas
Proceedings of the Iowa Academy of Science
The wedge-work of roots is a powerful and effective agent of weathering and performs an important part in breaking up solid rock. Since the indurated rocks, as a rule, are covered by mantle rock of considerable thickness the actual penetration of their seams, joints, and crevices by roots is concealed. In some cases, too, the mantle rock is of so great thickness that even the longest roots fail to reach the solid rock below. On bare rocky cliffs where there is sufficient moisture, trees, in some cases of large size, grow from crevices and joints where their seeds have sprouted. …
The Sublimation Curve For Selenium Crystals Of The Hexagonal System, L. E. Dodd
The Sublimation Curve For Selenium Crystals Of The Hexagonal System, L. E. Dodd
Proceedings of the Iowa Academy of Science
The type of apparatus used in the present work on the vapor tension of selenium, as well as the method, is due originally to Knudsen. The apparatus in the form in which Knudsen used it was modified somewhat by Egerton. Egerton's experimental scheme has been followed essentially in the present work.
Observations Of The Total Solar Eclipse Of June 8, 1918, At Matheson, Colorado, D. W. Morehouse
Observations Of The Total Solar Eclipse Of June 8, 1918, At Matheson, Colorado, D. W. Morehouse
Proceedings of the Iowa Academy of Science
The Drake University Observatory eclipse expedition occupied a very favorable site at Matheson, Colorado. It was wholly through the courtesy of Dr. Edwin B. Frost, Director of the Yerkes Observatory, who with Prof. E. E. Barnard, had selected this station as one of two very desirable locations, that the expedition was so happily situated.
Proceedings Of The Thirty-Third Annual Session (Of The Iowa Academy Of Science), Held At Cedar Falls, April 25 And 26, 1919: Minutes Of The Meeting; Staff & Committee Reports
Proceedings of the Iowa Academy of Science
No abstract provided.
In Memoriam: Byron D. Halsted, L. H. Pammel
In Memoriam: Byron D. Halsted, L. H. Pammel
Proceedings of the Iowa Academy of Science
No abstract provided.
List Of Members And Visitors In Attendance
List Of Members And Visitors In Attendance
Proceedings of the Iowa Academy of Science
No abstract provided.
The Resistance Of Streptococci To Germicidal Agents, Henry Albert
The Resistance Of Streptococci To Germicidal Agents, Henry Albert
Proceedings of the Iowa Academy of Science
During the past year and a half, streptococci have assumed an unusual role as causes of disease. They have been the cause of most of the serious infections of war wounds. They were almost entirely responsible for the severe epidemics of pneumonia and empyema which occurred in many places, especially military camps during the winter of 1917-18, and together with the pneumococcus were apparently the cause of most of the fatalities during the recent epidemic of influenza.
Animal Tracks, Food And Disposition: Is There Any Relation?, E. L. Palmer
Animal Tracks, Food And Disposition: Is There Any Relation?, E. L. Palmer
Proceedings of the Iowa Academy of Science
"He that runs may read" but he that runs may also be read and the reading of the tracks of birds and animals may lead to some very interesting observations. When speeding all animals move essentially alike so the following conclusions are based upon the method of locomotion adopted by the animal when moving slowly. This is shown in the first line of tracks under those given for each species.
The Barberry In Iowa And Adjacent States, L. H. Pammel
The Barberry In Iowa And Adjacent States, L. H. Pammel
Proceedings of the Iowa Academy of Science
Of the 160 species of barberry generally recognized only the following have been commonly cultivated in Iowa; the common or European barberry (Berberis vulgaris), the Japanese barberry (B. Thunbergii), the B. canadensis, B. amurensis, B. Sinensis, B. ilicifolia, B. Fischeri and B. maerocarpa. The B. Fischeri and B. maerocarpa are regarded as synonyms of B. canadensis. The common European barberry, though commonly credited to Western Europe, is Asiatic according to J. Lind's "The Barberry Bush and its Law," being a translation from Berberisbusken og Berberisloven.
Mammoth Clover Rust, W. H. Davis
Mammoth Clover Rust, W. H. Davis
Proceedings of the Iowa Academy of Science
Before the work of Liro, there was thought to be but one clover rust. He proved the rust on white clover to be autoecious and it was classified as Uromyces trifolii-repentis (Cast) Liro. It has been shown that the rust on red clover is also autoecious, having all four stages on red clover, and it is generally classified as Uromyces trifolii (Hedw. f.) Liro. The rust on alsike clover is autoecious, having all the stages, and was classified as Uromyces Hybridi, Davis, in Vol. XXIV, Iowa Academy of Science, 1917.
Rosa Pratincola Greene, Evelyn Ensign
Rosa Pratincola Greene, Evelyn Ensign
Proceedings of the Iowa Academy of Science
There is more or less confusion as to the name and description of the wild rose of the prairies. A study of this problem was undertaken more particularly with reference to our Iowa forms.
The Fern Flora Of Nebraska, T. J. Fitzpatrick
The Fern Flora Of Nebraska, T. J. Fitzpatrick
Proceedings of the Iowa Academy of Science
Nebraska lies near the center of the region known as the Great Plains of North America and near the eastern side of the semiarid district. The boundaries are natural or nearly so. Missouri river forms the eastern boundary, the northern boundary lies in the valley of the Niobrara, the southern in the valley of the Republican, while the western boundary is in the foothills.
Studies Upon The Absorption And Germination Of Wheat Treated With Formaldehyde, A. L. Bakke, H. H. Plagge
Studies Upon The Absorption And Germination Of Wheat Treated With Formaldehyde, A. L. Bakke, H. H. Plagge
Proceedings of the Iowa Academy of Science
Treating wheat with formaldehyde to prevent the covered or stinking smut of wheat is a general practice wherever wheat is grown. Henderson, Burmester, Johnson and Brittlebank have submitted results of germination tests where wheat has been soaked for varying periods, with the purpose of obtaining safe limits where the fungus is killed, while the seed is left intact. Naturally this is the important conception from the practical standpoint. But admitting this to be the case there are still many fundamental propositions which are still open for solution and of equal import to the practical phases of grain treating to prevent …
Officers, Past Presidents, And Members, Iowa Academy Of Science
Officers, Past Presidents, And Members, Iowa Academy Of Science
Proceedings of the Iowa Academy of Science
No abstract provided.
Activites Of Members Of The Iowa Academy During The World War
Activites Of Members Of The Iowa Academy During The World War
Proceedings of the Iowa Academy of Science
No abstract provided.
The Birds Of Marshall County, Iowa, Ii, Ira N. Gabrielson
The Birds Of Marshall County, Iowa, Ii, Ira N. Gabrielson
Proceedings of the Iowa Academy of Science
The continuation of a survey of the birds of Marshall County, Iowa.