Proceedings of the American Association for the Advancement of Science, Band 36


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Seite 23 - The wave of reptilian evolution had just risen to its crest, and perhaps was ready to break, when it was met and overwhelmed by the rising wave of mammalian Evolution." In this paper of LeConte's, which is entitled "On Critical Periods in the History of the Earth and their Relation to Evolution: and on the Quaternary as such a Period," may be found an excellent rejoinder of Prof.
Seite 37 - Race" in which he shows by tables a series of generations of certain families in which the progenitors being deaf mutes this peculiarity becomes perpetuated in many of the descendants. Recognizing fully the laws of heredity, natural selection, etc., he shows that the establishment of deaf-mute schools, in which a visual language is taught which the pupils alone understand tends to bring them into close...
Seite xxv - 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.
Seite xxviii - Council shall meet on the day preceding each annual meeting of the Association, and arrange the programme for the first day of the sessions. The time and place of this first meeting shall be designated by the Permanent Secretary. Unless otherwise agreed upon, regular meetings of the...
Seite 33 - I speak as a man of science — the Roman Catholic Church, the one great spiritual organization which is able to resist, and must, as a matter of life and death, resist, the progress of science and modern civilization, manages her affairs much better.
Seite 237 - Salicacece and Coniferce. At a later date3 he went further and stated that the Mycorhiza is a symbiotic condition which may perhaps be found in all trees under certain conditions ; that it is found only where the soil consists of humus or undecomposed plant remains ; that the fungus of the Mycorhiza conveys to the tree not only the necessary water and the mineral constituents of the soil but, also, the organic material derived directly from the...
Seite 252 - It results that the cusplets, being opposite to each other, experience a greater lateral pressure than the large central cusps. The effect of the collision between the cusplets would be to emphasize the relation still more; that is, the cusplets of the upper jaw would be wedged outward, while those of the lower jaw would be pressed inward, the major cusps retaining at first their original position. But with increase of the size of the teeth with all the cusps, the major cusps would soon assume in...
Seite 189 - There does not exist a world-wide system nor a world-wide group, but every system and every group is local. The classification developed in one place is perfectly applicable only there. At a short distance away some of its beds disappear and others are introduced ; farther on its stages cannot be recognized ; then its series fail and finally its systems and its groups.
Seite 12 - ... 3. The most typical or most generalized representatives of a group are found also near the centre of distribution, outlying forms being generally more or less aberrant or specialized." In the study of the eggs of birds of the same species, north and south, Dr. Allen shows that in the south the eggs are less in number and smaller in size.40 Mr. Robert Ridgway41 calls attention to the geographical variation observed in Dcndrccca.
Seite 36 - ... and portal. The azygos veins have imperfect valves. Place man upon ' all fours ' and the law governing the presence and absence of valves is at once apparent, applicable, so far as I have been able to ascertain, to all quadrupedal and quadrumanous animals. Dorsad veins are valved'; cephalad, ventrad and caudad veins have no valves.

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