Proceedings of the American Association for the Advancement of Science, Volume 48 |
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Overige edities - Alles bekijken
Veelvoorkomende woorden en zinsdelen
algebra American Association Anthropology Asa Gray Boston botany C. L. MARLATT Cambridge Canada Carboniferous century Charles chemical chemistry collected College Columbia Columbus Committee Conn crania deposits Devonian Devonian rocks discovery engineering Eskimos Europe evidence experiments F. W. PUTNAM fact fossils Gaspé Geological Survey geologist heat Henry human implements Institute investigation John knowledge Labrador limestone Mass Massachusetts meeting ment method Museum nature Neolithic observations Ohio organs Paleolithic paper period Permanent Secretary Ph.D Philadelphia physical physiology plants prehistoric present Prof Professor published race relations river Rose Polytechnic Institute sandstone scientific Section Silurian Sir William Dawson skull Society species specimens stone Stringocephalus temperature theory tion U. S. Naval Observatory United Univ University ventilation Vice President Washington William York
Populaire passages
Pagina 137 - I now mean by elements, as those chymists that speak plainest do by their principles, certain primitive and simple, or perfectly unmingled bodies; which not being made of any other bodies, or of one another, are the ingredients of which all those called perfectly mixt bodies are immediately compounded, and into which they are ultimately resolved...
Pagina 404 - He divided the whole coast line into sections, and organized, under separate parties, the essential operations of the survey simultaneously in each. He commenced the exploration of the Gulf Stream, and at the same time projected a series of observations on the tides, on the magnetism of the earth, and the direction of the winds at different seasons of the year. He also instituted a succession of researches in regard to the bottom of the ocean within soundings, and the forms of animal life which are...
Pagina xxvi - 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.
Pagina 457 - I have seen his lecture hall so crowded with young men, eager to hear his eloquent presentation of the subject by the professor, whom they so greatly admired, that not even standing room could be found in the hall. All the aisles would be filled, and even the windows crowded from the outside with eager listeners. His manner of presenting the commonist subject in science — clothing his thoughts, as he always did, with a marvelous fluency and clearness of expression and beauty of diction unsurpassed...
Pagina 145 - It is conceivable that the various kinds of matter, now recognized as different elementary substances, may possess one and the same ultimate or atomic molecule existing in different conditions of movement.
Pagina 2 - We have therefore reason to believe, from man's fertile intermixture, that he is one in species ; and that all organic species are divine appointments which cannot be obliterated, unless by annihilating the individuals representing the species.
Pagina 126 - For compressible flow this becomes: where y is the ratio of the specific heat at constant pressure to that at constant volume...
Pagina 238 - It is, therefore, of the highest importance to gain a clear insight into the means of modification and coadaptation. At the commencement of my observations it seemed to me probable that a careful study of domesticated animals and of cultivated plants would offer the best chance of making out this obscure problem. Nor have I been disappointed ; in this and in all other perplexing cases I have invariably found that our knowledge, imperfect though it be, of variation under domestication, afforded the...
Pagina 145 - These again may all be dependent upon atomic and molecular mobility. Let us imagine one kind of substance only to exist, ponderable matter; and further, that matter is divisible into ultimate atoms, uniform in size and weight. We shall have one substance and a common atom. With the atom at rest the uniformity of matter would be perfect. But the atom possesses always more or lesa motion, due, it must be assumed, to a primordial impulse.
Pagina 50 - ... number multiplied by the sum is the same as the second number multiplied by the first number together with the second number multiplied by itself. Putting all these together, we find that the square of the sum is equal to the sum of the squares of the two numbers together with twice their product. Two things may be observed on this comparison. First, how very much the shorthand expression gains in clearness from its brevity. Secondly, that it is only shorthand for something which is just straightforward...