Proceedings of the American Association for the Advancement of Science, Τόμος 21 |
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A. A. A. S. VOL amount andalusite banks Basin Blanchard Ridge bones boulders character Chicago clay Committee common granite County crania Cretaceous cut-off Delta Survey deposited direction drift Dubuque east excursion F. W. PUTNAM fact feet felsite force Fort Dodge Fort Wayne geological Gesellschaft glacier gneiss gravel Gulf Stream hardpan hundred Illinois 17 inches Indiana Indianapolis Iowa John's Ridge JOSEPH LOVERING known labradorite Lake Erie lands latitude Lawrence levees Massachusetts Massachusetts 18 Maumee Maumee River meeting miles moraine mound-builders mounds nearly Norian North-Western Ohio observed occipital ohms open sea open water orthoclase outlet parietal passed Permanent Secretary portion present Professor Railroad resistance rock sand Section Sioux skull soil species specimens Spitzbergen strata superciliary ridges supposed surface suture temperature tion trachytic valley Wabash Waterlime Wert Ridge White Mountain winds York 19
Δημοφιλή αποσπάσματα
Σελίδα xv - Association are, by periodical and migratory meetings, to promote intercourse between those who are cultivating science In different parts of America, to give a stronger and more general impulse and more systematic direction to scientific research, and to procure for the labors of scientific men increased facilities and a wider usefulness.
Σελίδα 18 - ... inhabit both our eastern and western forest districts ; several poplars, one very like our balsam poplar, or balm of Gilead tree ; more beeches than there are now, a hornbeam, and a hop-hornbeam, some birches, a persimmon, and a planer-tree, near representatives of those of the Old World, at least of Asia, as well as of Atlantic North America, but all wanting in California ; one Juglans like the walnut of the Old World, and another like our black walnut ; two or three grapevines, one near our...
Σελίδα 192 - His facts have referred mainly to Coniferce and Amentacece, although not confined to them. The hesitation felt by many minds in regard to the acceptance of the above proposition has originated chiefly from the familiarity of the principle that "there is a certain degree of antagonism between the nutritive and the generative functions, the one being executed at the expense of the other ; " along with the weight of some very familiar facts concerning the generally greater size
Σελίδα 115 - With this temperature, it crosses the 40th degree of north latitude, and there, overflowing its liquid banks, it spreads itself out for thousands of square leagues over the cold waters around...
Σελίδα 10 - Mimdchuria), as they are from those of Atlantic North America. Their near relatives, when they have any in other lands, are mostly southward, on the Mexican plateau, or many as far south as Chili. The same may be said of the plants of the intervening great plains, except that northward and in the subsaline vegetation there are some close alliances with the flora of the steppes of Siberia.
Σελίδα 17 - Very similar would seem to have been the fate of a more familiar gymnospermous tree, the Gingko or Salisburia. It is now indigenous to Japan only. Its ancestor, as we may fairly call it, — since, according to Heer, " it corresponds so entirely with the living species that it can scarcely be separated from it...
Σελίδα 61 - Journ. vp 255. passed over it in 1845, and was so much struck with its defects, although it had been recently erected, that he notified the authorities in regard to them. A few years afterwards it gave way when troops were marching over it.* A few years ago, a terrible disaster befell a battalion of French infantry, while crossing the suspension -bridge at Angiers, in France. Reiterated warnings were given to the troops to break into sections, as is usually done. But the rain was falling heavily,...
Σελίδα 14 - had introduced and familiarized the scientific world with those now current ideas respecting the history and vicissitudes of species with which I attempted to deal in a moderate and feeble way. My speculation was based upon the former glaciation of the northern temperate zone, and the inference of a warmer period preceding and perhaps following.
Σελίδα 20 - I agree with the writer that this first conclusion is premature and unworthy,— I will add, deplorable. Through what faults or infirmities of dogmatism on the one hand, and scepticism on the other, it came to be so thought, we need not here consider. Let us hope, and I confidently expect, that it is not to last; that the religious faith which survived without a shock the notion of the fixity of the earth itself may equally outlast the notion of the absolute fixity of the species which inhabit it...
Σελίδα 6 - ... long-lived antediluvians of scripture, to hand down to us, through a few generations, the traditions of centuries, and so tell us somewhat of the history of their race. Fifteen hundred annual layers have been counted, or satisfactorily made out, upon one or two fallen trunks. It is probable that close to the heart of some of the living trees may be found the circle that records the year of our Saviour's nativity. A few generations of such trees might carry the history a long way back.