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Articles 1263661 - 1263690 of 1265073
Full-Text Articles in Entire DC Network
The Wilson Ornithological Report, Wilson Bulletin
The Wilson Ornithological Report, Wilson Bulletin
Wilson Bulletin
No abstract provided.
The Crow Report, Wilson Bulletin
Our Official Organs, Wilson Bulletin
Nesting Of The Ground Dove, Wilson Bulletin
Associate, Wilson Bulletin
President's Address, Reuben M. Strong
Title Page - Letter Of Transmittal, Herbert Osborn
Title Page - Letter Of Transmittal, Herbert Osborn
Proceedings of the Iowa Academy of Science
No abstract provided.
Proceedings Of The Ninth Annual Session Of The Iowa Academy Of Sciences; Staff & Committee Reports, Herbert Osborn
Proceedings Of The Ninth Annual Session Of The Iowa Academy Of Sciences; Staff & Committee Reports, Herbert Osborn
Proceedings of the Iowa Academy of Science
The ninth annual meeting of the Iowa Academy of Sciences was held in the Y. M. C. A. building at Des Moines, December 27 and 28. The following papers were read in full or by title, and by the action of the Academy were referred to a committee of publication consisting of C. R. Keyes, T. P. Hall and H. F. Bain.
Constitution Of The Academy & Articles Of Incorporation
Constitution Of The Academy & Articles Of Incorporation
Proceedings of the Iowa Academy of Science
No abstract provided.
Address Of The Retiring President - Recent Advances In The Theory Of Solutions, Launcelot W. Andrews
Address Of The Retiring President - Recent Advances In The Theory Of Solutions, Launcelot W. Andrews
Proceedings of the Iowa Academy of Science
Ten years ago nothing was known of the molecular magnitudes of substances which could not be converted into the gaseous condition. Concerning the constitution of the much greater number of compounds that exist only as solids or liquids, our ignorance was complete.
Interloessial Till Near Sioux City, Iowa, J. E. Todd, H. Foster Bain
Interloessial Till Near Sioux City, Iowa, J. E. Todd, H. Foster Bain
Proceedings of the Iowa Academy of Science
Till and loess are well known deposits and need not be defined. It is a peculiar and anomalous relation between the two which it is proposed to describe in this paper. It is well known that the till almost universally occupies a position below the loess wherever the two are found in the same section. A few cases only have been noted where the reverse is true. Such an instance was described by McGee and Call in an account of the loess near Des Moines. Similar occurrences have been reported by other observers from central and eastern Iowa. These may …
Record Of The Grinnell Deep Boring, Arthur J. Jones
Record Of The Grinnell Deep Boring, Arthur J. Jones
Proceedings of the Iowa Academy of Science
Work was begun on the deep well in October, 1892, but it was not completed until the following year. The ordinary churn drill was used and the hole was first drilled eight inches in diameter, but later the upper portion was enlarged to ten inches. The record has been more carefully kept than is usual in drilling such wells, but cannot be relied upon as absolutely exact. In many cases the fragments of the overlying stratum are mixed with that underneath, and the thickness of each formation cannot be exactly determined. This renders the results only approximately correct, but it …
Maquoketa Shales In Delaware County, Samuel Calvin
Maquoketa Shales In Delaware County, Samuel Calvin
Proceedings of the Iowa Academy of Science
From the relation of Delaware County to the great Niagara escarpment it would scarcely be expected that rocks older than the Upper Silurian would be found within its limits. Upper Silurian sediments indeed constitute the rocks that may be said to be normal to the entire county. They cover probably ninety-nine per cent of its area. Without exception all the higher lands are occupied by them, and most of the valleys have a floor of Niagara dolomite. Still some of the valleys have cut through the Niagara limestone down into the underlying shales of the Maquoketa age, and very many …
Insects, H. F. Wickham
Insects, H. F. Wickham
Proceedings of the Iowa Academy of Science
Cychrus lecontei, Dej., Independence. Nomaretus cavicollis, Lec., Iowa, (Leng & Beutenmuller.) Carabus limbatus, Say, Iowa City. Elaphrus clairvillei, Kirby, Iowa City. Nebria pallipes, Say, Independence. Clivina impressifrons, Lec., Iowa City. Bembidium postremum, Say, Iowa {Reinecke). Evarthrus sodalis, Lec., Iowa City. Amara remotestriata, Doj., Iowa (Hamilton). Diplochila obtusa, Lec., Iowa City. Platynus picticornis, Newm., Iowa (Reinecke). --placidus, Say, Iowa City. Perigona pallipennis, Lec., Iowa (Horn). Galerita atripes, Lec., Iowa City. Callida punctata, Lec., Iowa City. Pinacodera limbata, Dej., Iowa City. Helluomorpha bicolor, Harr., …
A Kymograph And Its Use, W. S. Windle
A Kymograph And Its Use, W. S. Windle
Proceedings of the Iowa Academy of Science
The science of physiology in its present condition owes much of its advancement to the skillful manipulation of cunningly devised apparatus. Without the successful invention of delicate mechanical appliances many of the profound researches of Foster, Du Bois, Raymond, McKendrick, Martin and others would never have been possible. It must be granted, however, that invention and skill in manipulation have been supplemented by clear and comprehensive interpretation of results obtained, and it is to the latter that most credit is due. In emphasizing the value of scientific apparatus and its use, we recognize the imperative need of a fundamental knowledge …
Changes That Occur In Ripening Corn, C. F. Curtiss
Changes That Occur In Ripening Corn, C. F. Curtiss
Proceedings of the Iowa Academy of Science
The great importance of corn as a forage and grain crop has induced the writer to record some observations in noting the successive changes that occur in the ripening process of this plant. These observations have been confirmed and emphasized by the generally unsatisfactory experience of the present season in the use of forage made from the immature corn plant.
A Chemical Study Of Honey, W. H. Heileman
A Chemical Study Of Honey, W. H. Heileman
Proceedings of the Iowa Academy of Science
It has long been known that honey is composed chiefly of dextrose and levulose (reducing sugars), with a small per cent of sucrose. These, with water and ash, are generally all that is given in an analysis, and their sum invariably falls from three to ten per cent below one hundred. The results of analyses vary with different examples, as shown by the following summary of results, obtained by different observers.
Plant Lice Infesting Grass Roots, Herbert Osborn, F. A. Sirrine
Plant Lice Infesting Grass Roots, Herbert Osborn, F. A. Sirrine
Proceedings of the Iowa Academy of Science
During the fall of 1889 the senior author of this paper determined that a species of plant louse, infesting roots of annual grasses was identical with the "Dogwood plant louse" (Schizoneura corni Fabr.), carrying the work far enough to prove that the winged forms could be transferred from grass roots to dogwood, on which they colonized. As he found the root forms principally on annual grasses which were of no economic value, it was naturally a question of interest to determine whether they might affect forage plants. Furthermore, the occurrence of non-migratory forms on certain of the grasses examined, left …
Some Bred Parasitic Hymenoptera In The Iowa Agricultural College Collection, Alice M. Beach
Some Bred Parasitic Hymenoptera In The Iowa Agricultural College Collection, Alice M. Beach
Proceedings of the Iowa Academy of Science
This list is prepared from the material in the collections of the Iowa Agricultural College and the Iowa Experiment Station, and may be considered a preliminary record of the parasitic Hymenoptera of the state. In its preparation the notes and records made by Prof. C. P. Gillette, while entomologist of the Experiment Station, have been freely consulted and largely drawn upon. The list is still incomplete for much material yet remains to be classified and records to be filled out.
Distribution Of Some Weeds In The United States, Especially Iva Xanthifolia, Lactuca Scariola, Solanum Corolineum And Solanum Rostratum, L. H. Pammel
Proceedings of the Iowa Academy of Science
One of the interesting parts dealing with geographical botany is the question of the distribution of plants over the earth's surface, where man has played an important part. Many changes have occurred in the character of our North American flora since it has been occupied by man. In many cases it has become quite impossible to tell when and where plants were first introduced. We have, it is true, in some cases records when plants were introduced, but in the vast majority of cases there were no records at hand. Early collectors in many cases simply mentioned vague localities with …
Lichens Collected By Dr. C. C. Parry In Wisconsin And Minnesota In 1848, Bruce Fink
Lichens Collected By Dr. C. C. Parry In Wisconsin And Minnesota In 1848, Bruce Fink
Proceedings of the Iowa Academy of Science
The lichens of this collection are all conspicuous foliaceous or fruticulose forms. One striking feature is the evident care of the collector to preserve excellent specimens. There are no notes accompanying each packet. However, if all were collected in one of the above named states as is stated on the card accompanying the package sent me, the collection is a very good one, as Cetraria Islandica, Evernia vulpina, and Stereocaulon puschale, are probably new or very rare in either state. The same may probably be said of the two Umbilicarias listed.
Study Of Glands In The Hop-Tree, Cassie M. Bigelow
Study Of Glands In The Hop-Tree, Cassie M. Bigelow
Proceedings of the Iowa Academy of Science
In studying this plant, the main object has been to bring out the characteristics of the glandular structures in Ptelea trifoliata and the differences between the glandular structure of this plant and other used in a like way as the hop.
Graphic Representation Of The Properties Of The Elements, T. Proctor Hall
Graphic Representation Of The Properties Of The Elements, T. Proctor Hall
Proceedings of the Iowa Academy of Science
In Mendeleeff's classification the elements are arranged in order on a plane surface, so as to increase along one axis in atomic weight, and along the other axis in valence. The properties of an element can then, to some extent, be inferred from its relation to the others on the diagram. Some of the relations are found to be better expressed when the surface is made cylindrical.
Certain Minerals Of Webster County, Iowa, Arthur C. Spencer
Certain Minerals Of Webster County, Iowa, Arthur C. Spencer
Proceedings of the Iowa Academy of Science
Within the limits of Webster County are found a number of interesting minerals. The following notes are descriptive of a few of them.
Pollination Of Cucurbits, L. H. Pammel, Alice M. Beach
Pollination Of Cucurbits, L. H. Pammel, Alice M. Beach
Proceedings of the Iowa Academy of Science
During the season of 1892 one of us was engaged in crossing some of the cultivated cucurbits. Incidentally some attention was given to their pollination. As comparatively little has been published concerning the pollination of these plants, these notes may be of interest.
Psyllidae Found At Ames, C. W. Mally
Psyllidae Found At Ames, C. W. Mally
Proceedings of the Iowa Academy of Science
While studying Hackberry Psyllidae last year, several other interesting species were found. This led to a general study of the family as represented in this locality. It was the original intention to give a general account of the anatomy and life history, with descriptions of new species. However, only the latter part is given at this time.
Cement Materials In Iowa, E. H. Lonsdale
Cement Materials In Iowa, E. H. Lonsdale
Proceedings of the Iowa Academy of Science
Sometime after the discovery of massive deposits of the Cretaceous chalk in the northwestern portion of the state the question arose as to the adaptability thereof-- whether this calcareous material might be considered of any practical value and if so what means should be taken to reduce it preparatory to its application. Certain initiatory steps were undertaken towards determining these points but as yet but little has been done. Chemical analyses have been made of the rock and test shafts put down in order to ascertain the thickness of the beds, but further development has never been attempted.
Mississippian Rocks Of Central Iowa, H. Foster Bain
Mississippian Rocks Of Central Iowa, H. Foster Bain
Proceedings of the Iowa Academy of Science
The Mississippian series includes all the rocks lying between the base of the coal measures and the top of the Devonian. They have been principally studied in southeastern Iowa and adjacent portions of neighboring states. More recently the study of the exposures of that portion of central Iowa which includes Marion, Mahaska, Keokuk, and Washington Counties has allowed the construction of a central Iowa section.
Formation Of The Flint Beds Of The Burlington Limestones, Francis M. Fultz
Formation Of The Flint Beds Of The Burlington Limestones, Francis M. Fultz
Proceedings of the Iowa Academy of Science
For convenience the flint beds of the Burlington limestones are usually separated into two divisions, known as the "lower" and '' upper '' flint beds. The lower series is probably from fifteen to twenty feet thick and the upper a little more. They have always been classed as the latest deposits of the Lower Burlington and Upper Burlington limestones, respectively. The lower beds are not so continuously chert as the Upper; in fact much of the deposit is siliceous shale mixed with clay and containing thin bands of limestone. There are also certain strata which look like heavy-bedded limestone, but …
Synopsis Of American Paleozioc Echinoids, Charles Rollin Keyes
Synopsis Of American Paleozioc Echinoids, Charles Rollin Keyes
Proceedings of the Iowa Academy of Science
For the more minute correlations in stratigraphy no group of fossils is of more practical service than the echinoderms. Where the remains of these organisms are abundant, as in many of the Paleozoic rocks, the entire history of events may be inferred from them alone. Composed of hard parts or plates which are more or less regularly shaped and which are arranged according to a definite plan the evolution of the various forms may be readily traced and the slightest changes in physical conditions at the time of sedimentation quickly detected. In the Mississippi basin the crinoids are widely distributed …