Proceedings of the National Academy of Sciences of the United States of America, Volume 3National Academy of Sciences, 1917 - Electronic journals The Proceedings of the National Academy of Sciences (PNAS) publishes research reports, commentaries, reviews, colloquium papers, and actions of the Academy. PNAS is a multidisciplinary journal that covers the biological, physical, and social sciences. |
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Common terms and phrases
Academy of Sciences acid Amer amount angle animals appear atoms average axis C. B. DAVENPORT cadmium cells Chairman chromosomes clusters coal balls color Committee constant corresponding crystals curve deposit determined differentiation distance E. H. Moore E. W. Morley effect electrons embryo endothelium equation error evidence experiments factors females figure fringes function galactic geodesic curvature indicate investigation LABORATORY larvae length leucite limestone lines magnitude males mass means measured melanophores Messier Messier 13 method Millikan molecules Mount Wilson National Academy National Research Council normal observed obtained organization orthoclase photographic plane plates present pressure probably produced proper motion radial velocities RAYMOND PEARL reaction reefs regeneration region relation reported sea water shown solution species stars substance surface temperature theory tion University Washington
Popular passages
Page 9 - Every body continues in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed upon it.
Page 9 - To every action there is always opposed an equal reaction: or, the mutual actions of two bodies upon each other are always equal and directed to contrary pans.
Page 584 - ... by Dr. LA Bauer, Director of the Department of Terrestrial Magnetism of the Carnegie Institution of Washington. He also stated that this work had the approval of the President of the Carnegie Institution of Washington.
Page 105 - ... (Conklin 1908). Ontogeny begins with the differentiation of the egg in the ovary and not at the moment of fertilization; at the latter time some of the most general and fundamental differentiations have already occurred. Indeed the cytoplasm of the egg is the more or less differentiated body of the embryo. 3. Is Inheritance through the Egg Cytoplasm Non-Mendelian? — Whenever a character is transmitted as such through the egg cytoplasm and not as factors in the chromosomes of egg and sperm it...
Page 391 - The entrance of the United States into the war unites our men of science with yours in a common cause. The National Academy of Sciences, acting through the National Research Council, which has been designated by President Wilson and the Council of National Defense to mobilize the research facilities of the country, would gladly cooperate in any scientific researches still underlying the solution of military or industrial problems.
Page 398 - The holders of the medal for eminence in the application of science to the public welfare shall be notified, like members, of the meetings of the Academy and invited to participate in its scientific sessions.
Page 199 - I gave more direct evidence of the existence of more than one band in the spectra of these substances. In their original paper2 Lenard and Klatt depicted these spectra as complex instead of single; but in both the earlier and the later papers attention is given rather to the mode of excitation than to the character of the phosphorescent light itself and the regions of excitation in the violet and ultra violet are carefully mapped. Significance of the Bands of Excitation. — It seemed probable that...
Page 103 - inverse symmetry' of these snails may be traced back through the later and earlier cleavage stages to the unsegmented egg itself which is inversely symmetrical in sinistral as compared with dextral forms. (4) Types of Egg Organization. The polar differentiation of an egg is manifested particularly in the localization of different kinds of materials in different parts of the egg. These materials may be inert pigment or yolk, but their localization by the activity of the cytoplasm indicates a definite...
Page 744 - Pp. 93-95. 8. On the structure of the brain of the sessile-eyed Crustacea. I. The Brain of Asellus and the eyeless form Cecidotaea.
Page 744 - On a method of precisely measuring the vibratory periods of tuning-forks, and the determination of the laws of the vibrations of forks; with special reference to these facts and laws to the action of a simple chronoscope.