The Proceedings of the Iowa Academy of Science, Том 3Iowa Academy of Science, 1896 List of members in each volume. |
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abdomen abundant Agricultural College antennæ apex atom band basal base beds Big Sioux river border bristles bulliform cells carene Cedar clay color common Council Bluffs cubitus deposited dorsal E. G. Preston ether fact forest front genus gneiss hadrome Hawarden hemelytra hills Hitchcock Hull inoculated Iowa Academy joints larvæ Le Claire leaf leptome Little Rock Little Rock C. R. Little Rock Herb loess mounds low grounds macropus margin mesoscutum mestome bundles Michx Missouri Valley Moines Nashua nearly Newell Nutt observed occur ocelli Onawa opposite Hawarden organism parenchyma plants posterior angle prairies pronotum prothorax region river Rock C. R. Ball Roestelia schist scientific scutellum segment side Sioux City B. W. slate Smithland soil South Dakota species specimens spines Spores stereome surface thorax tibiæ tion transverse trees tritici Turin upper varieties vein vertex wings woods yellow
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Сторінка 98 - Thus, on the prairies we sometimes meet with ridges of coarse material, apparently deposits of drift, on which, from some local cause, there has never been an accumulation of fine sediment; in such localities we invariably find a growth of timber. This is the origin of the groves scattered over the prairies, for whose isolated position and peculiar circumstances of growth we are unable to account in any other way.
Сторінка 93 - A county park well-kept and cared for "would be a perpetual object lesson to the whole community, "would show how the rocky knoll or deep ravine on one's own eighty-acre farm, might be made attractive, until presently, instead of the angular maple groves with which our esthetic sense now vainly seeks appeasement, we should have a country rich in groves conformable to nature's rules of landscape gardening if not to nature's planting. I am aware that at the first the right appreciation of a public...
Сторінка 60 - ... of lime. It may be quarried in symmetrical blocks of any desired dimensions, while the Le Claire limestone breaks into shapeless masses wholly unfit for building purposes. The quarry beds of the Anamosa stage are quite free from fossils, but along the Cedar river in Cedar county the brachiopod fauna of the upper part of the Le Claire re-appears in great force in a stratum four feet in thickness, up near the top of the formation. The beds of the Anamosa stage are very undulating and dip in long...
Сторінка 54 - The Le Claire limestone is in some respects unique among the geological formations of Iowa. In the first place it varies locally in thickness, so much so that its upper surface is exceedingly undulating, the curves in some places being very sharp and abrupt. In the second place it differs from every other limestone of Iowa in frequently exhibiting the peculiarity of being obliquely bedded on a large scale, the oblique bedding often affecting a thickness, of fifteen or twenty teet.
Сторінка 60 - Kansan stage and the fresh, hard, un decayed lowan boulders in the drift sheet above the gravels is very striking. Many of the boulders from the gravels are coated more or less with a secondary calcareous deposit, a feature not uncommon among boulders taken directly from the Kansan drift sheet in other parts of Iowa. As to their origin, the Buchanan gravels are made up of materials derived from the Kansan drift. As to age, they must have been laid down in a body of water immediately behind the retreating...
Сторінка 107 - ... are inconspicuous; (2) it commonly contains unoxidized carbonate of lime in such quantity as to effervesce freely with acid; (3) it frequently contains nodules and minute ramifying tubules of carbonate of lime; (4) in many regions it contains abundant shells of land and fresh-water mollusca; (5) it is commonly so friable that it may be removed with a spade or impressed with the fingers, yet it resists weathering and erosion in a remarkable manner, standing for years in vertical faces and developing...
Сторінка 98 - And although chemical composition may not be without influence in bringing about this result, which is a question worthy of careful examination, yet we conceive that the extreme fineness of the particles of which the prairie soil is composed, is probably the principal reason why it is better adapted to the growth of its peculiar vegetation, than to the development of forests.
Сторінка 92 - ... something of the monotonous grind which makes up the life-long experience of by far the larger number of our fellow-men. On the farm, in the shop, in the mine, day after day, one unceasing round of toil into which the idea of pleasure or freshness never enters. How many thousands of our fellow-men, tens of thousands of our women see nothing but the revolving steps of labor's treadmill, day in, day out, winter and summer, year after year, for the whole span of mortal life. This is especially so...
Сторінка 91 - ... this paper would seem to require little definition. By county parks are meant simply open grounds available for public use in rural districts as are city parks in towns. There is nothing new in the idea; it is simply an effort to call back into public favor the once familiar public " common." This does not, however, refer simply to public land such as government land, to be claimed and plundered by the first comer, nor indeed to land to be used by the public indiscriminately at all, but to land...
Сторінка 98 - Taking into consideration all the circumstances under which the peculiar vegetation of the prairie occurs, we are disposed to consider the nature of the soil as the prime cause of the absence of forests and the predominance of the grasses over this widely -extended region. And although chemical composition may not be without influence in bringing about this result, which is a question for...