Proceedings of the American Association for the Advancement of Science, Volum 23 |
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A. A. A. S. VOL acid angles animals annual Anomis ASA GRAY Association Boston Cambridge carbonate claws coal-measure cobaltite Cocopas comet Conn copper cotton worm distance edge elected erosion experiments extended F. W. PUTNAM fact feet force formation germ glacial glaciers glaucodot granite Hartford Haven hundred inches insects Joseph Lovering larva larvæ leaf leaves less light lime lobster magnitude Mass meeting miles moth motion mountain nitric acid nitrogen number of stars O. C. MARSH observed Ohio organic orifice original paper passed Penn Permanent Secretary Philadelphia planes plant plastids plastidules portion present President Prof pyrite rainfall region ridges River rocks sand Sarracenia satellites scientific Section seen shell side silicate solar species Standing Committee strata structure summit sun-spot area surface tail Tetradymite theory tion trap Triassic tube Umbriel valley variolaris velocity vibrations Washington York
Passatges populars
Pàgina 22 - That gravity should be innate, inherent and essential to matter, so that one body may act upon another at a distance through a vacuum, without the mediation of any thing else, by and through which their action and force may be conveyed from one to another, is to me so great an absurdity, that I believe no man who has in philosophical matters a competent faculty of thinking, can ever fall into it.
Pàgina xvii - The objects of the 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.
Pàgina 10 - And yet one physicist, by using a distance of less than six miles, and another, without going outside of his laboratory, have discovered what astronomers had searched heaven and earth to find out. By these capital experiments the science of optics has achieved its own independence. Let us see what they have done, at the same time, for astronomy. The sequences in the eclipses of Jupiter's moons are modified by the velocity of light. The aberration of starlight is a measure of the ratio between the...
Pàgina 87 - I have now recapitulated the facts and considerations which have thoroughly convinced me that species have been modified, during a long course of descent. This has been effected chiefly through the natural selection of numerous successive, slight, favourable variations; aided in an important manner by the inherited effects of the use and disuse of parts; and in an unimportant manner, that is in relation to adaptive structures, whether past or present, by the direct action of external conditions,...
Pàgina 27 - Nobody, surely, in his sober senses, has ever pretended to understand the mechanism of gravitation; and yet what sublime discoveries was our immortal Newton enabled to make, merely by the investigation of the laws of its action!
Pàgina 103 - Therefore I should infer from analogy that probably all the organic beings which have ever lived on this earth, have descended from some one primordial form, into which life was first breathed.
Pàgina 31 - The energy, that of light and radiant heat, thus emitted, is dissipated always more and more widely through endless space, and never has been, probably never can be, restored to the Sun, without acts as much beyond the scope of human intelligence as a creation or annihilation of energy, or of matter itself, would be.
Pàgina 154 - Michigan, in accordance with the vote accepting the very cordial invitations extended by the Governor of the State, the Mayor of the City, and the Detroit Scientific Association.
Pàgina 87 - With respect to the means of modification, he attributed something to the direct action of the physical conditions of life, something to the crossing of already existing forms, and much to use and disuse, that is, to the effects of habit.
Pàgina 43 - A bill for the appointment of a commission to inquire into the destruction of forests, and into the measures necessary for the preservation of timber. We also adopt and make a part of the report, the letter of Dr. Franklin B. Hough, chairman of the committee of the American Association for the Advancement of Science upon the subject of forestry and his very able and scientific analysis...