The American Naturalist, Volumul 11Essex Institute, 1877 |
Din interiorul cărții
Rezultatele 1 - 5 din 71
Pagina 24
... fact that in their migrations the locusts often seem to select cultivated tracts , rapidly cross the treeless , barren plains , and linger and die on the prairies and western edge of the fertile valleys of the Missouri and Mississippi ...
... fact that in their migrations the locusts often seem to select cultivated tracts , rapidly cross the treeless , barren plains , and linger and die on the prairies and western edge of the fertile valleys of the Missouri and Mississippi ...
Pagina 27
... fact may be suf- ficient to account for the prevailing course of the return migra- tions of the locust from the ... facts bearing on the return migrations , in order to know where the locusts go in their return migrations the second year ...
... fact may be suf- ficient to account for the prevailing course of the return migra- tions of the locust from the ... facts bearing on the return migrations , in order to know where the locusts go in their return migrations the second year ...
Pagina 33
... fact of their having made gold artificially , yet we are com- pelled to accord to them a high state of civilization , and the possession of as much knowledge ' in metallurgy specially consid- ered as we ourselves own . We must also ...
... fact of their having made gold artificially , yet we are com- pelled to accord to them a high state of civilization , and the possession of as much knowledge ' in metallurgy specially consid- ered as we ourselves own . We must also ...
Pagina 35
... fact , we must take nothing for granted if we seek the truth ; and right here , when we fancy we have unraveled the whole mystery , we are met with the troublesome query whether the trace of gold that we have found may not be due to a ...
... fact , we must take nothing for granted if we seek the truth ; and right here , when we fancy we have unraveled the whole mystery , we are met with the troublesome query whether the trace of gold that we have found may not be due to a ...
Pagina 36
... facts . We are a little too conservative and careful to jump at his conclusion , but we really feel that we do not ... fact that the film has thickened upon the lower edge of the inclined surface , under the influence of gravity . The ...
... facts . We are a little too conservative and careful to jump at his conclusion , but we really feel that we do not ... fact that the film has thickened upon the lower edge of the inclined surface , under the influence of gravity . The ...
Alte ediții - Afișează-le pe toate
Termeni și expresii frecvente
abundant Algæ American ancient animals antennæ appear archæology Arctic birds bones butterflies cañons cells character coast color Colorado contain Coryphodon Cretaceous Crustacea deposits distribution domestic turkey east eggs ELLIOTT COUES Eocene exhibited existence exploration fact fauna feet female Figure fishes flora flowers formation fossil genera genus Geographical geological geologist glacial habits hundred imaginal discs inches Indians insects interesting Island Key West Killingworth Lake land larvæ Lepidoptera living locust male mammals mass microscope migrations miles Miocene Mountains Museum NATURALIST northern O. C. Marsh object observed organs origin paper peculiar period plants plates Pliocene portion present probably Prof Professor recent region River rocks sand scientific seen sepals shells side Society species specimens stone structure surface Survey Tertiary theory tion trees tribes uniformitarian valley vegetation W. H. Dall
Pasaje populare
Pagina 219 - I do not wish to particularise, but I dare say many of you, seeking knowledge, or in the laudable desire to employ a holiday usefully, have visited some great natural history museum. You have walked through a quarter of a mile of animals, more or less well stuffed, with their long names written out underneath them; and, unless your experience is very different from that of most people, the upshot of it all is that you leave that splendid pile with sore feet, a bad headache, and a general idea that...
Pagina 276 - The people are somewhat white, they wear apparel, and lie in beds, their weapons are bows, they have emeralds and other jewels, although they esteem none so much ,as turquoises, wherewith they adorn the walls of the porches of their houses, and their apparel and vessels, and they use them instead of money through all the country.
Pagina 467 - I look at the geological record as a history of the world imperfectly kept, and written in a changing dialect; of this history we possess the last volume alone, relating only to two or three countries. Of this volume, only here and there a short chapter has been preserved ; and of each page, only here and there a few lines.
Pagina 214 - In an Englishman's mouth it generally means that by which we get pudding or praise, or both. I have no doubt that is one meaning of the word utility, but it by no means includes all I mean by utility. I think that knowledge of every kind is useful in proportion as it tends to give people right ideas, which are essential to the foundation of right practice, and to remove wrong ideas, which are the no less essential foundations and fertile mothers of every description of error in practice. And inasmuch...
Pagina 719 - Darwin as to the display of color and ornaments by the male birds, there is a total absence of any evidence that the females admire or even notice this display. The hen, the turkey, and the pea-fowl, go on feeding while the male is displaying his finery, and there is reason to believe that it is his persistency and energy rather than his beauty which wins the day.
Pagina 715 - ... colour-variations either to one sex only or to both sexes ; the difference depending on some unknown law, and not being due to natural selection. I have long held this portion of Mr. Darwin's theory to be erroneous ; and have argued that the primary cause of sexual diversity of colour was the need of protection, repressing in the female those bright colours which are normally produced in both sexes by general laws ; and I have attempted to explain many of the more difficult cases on this principle....
Pagina 9 - After much consideration, and with assuredly no bias against Mr. Darwin's views, it is our clear conviction that, as the evidence stands, it is not absolutely proven that a group of animals, having all the characters exhibited by species in Nature, has ever been originated by selection, whether artificial or natural.
Pagina 446 - The International Exhibition to be held at Paris in 1878 will furnish such an occasion, and it is proposed to invite to that end governmental geological surveys, learned societies and private individuals throughout the world, to send to Paris such collections as will make the geological department of that exhibition as complete as possible. In order to take advantage of the collections which may thus be brought together, it is moreover proposed to convoke an International...
Pagina 467 - ... circumstances, and the blank intervals between the successive stages as having been of vast duration. But we shall be able to gauge with some security the duration of these intervals by a comparison of the preceding and succeeding organic forms. We must be cautious in attempting to correlate as strictly contemporaneous two formations, which include few identical species, by the general succession of their forms of life.
Pagina 114 - The Rocky Mountain locust or grasshopper, being the report of proceedings of a conference of the Governors of several Western States and Territories, together with several other gentlemen, held at Omaha, Nebr., on the 25th and 26th days of October, 1876, to consider the locust problem ; also a summary of the best means now known for counteracting the evil.