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ABSTRACT acid action American animals appears Association attention bases birds Born Boston called changes character Charles Chem Cleveland closely College color Committee compared condition Conn connection considered containing continuous derived determined Died direction effect engineering existence experiments fact feet force forms fungi geologic give given Henry important increase indicate interesting James John known lake less lower magnetic March Mass material matter means meeting method names natural observed obtained Ohio organic origin parasites period Philadelphia plants position possible practical present probably produced Prof Professor question referred regard relation remains represented river rocks says scientific shows species structure suggested theory tion true United University Washington York
Seite 16 - ... that I attribute the modification of species exclusively to natural selection, I may be permitted to remark that in the first edition of this work, and subsequently, I placed in a most conspicuous position — namely, at the close of the Introduction the following words : "I am convinced that natural selection has been the main but not the exclusive means of modification.
Seite xxv - 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.
Seite 38 - Protestant pastors saying that had they been priests of another religion leading celibate lives these men would not have been born. It is considered an intrusion into matters which do not concern science when such inquiries are made, but the scientist has very deeply at heart the intellectual and moral welfare of the community. If the cause of degradation and ignorance, of poverty, of contagious disease, or of any of the miseries which make a nation wretched can be pointed out by scientific methods,...
Seite 23 - 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. Clarence King's lecture before the Sheffield Scientific School on the subject of Catastrophism and Evolution. Among the most interesting discoveries connected with these creatures is the determination by Professor Marsh74 that these early mammals, birds and reptiles had brains of diminutive proportions.
Seite 12 - The maximum physical development of the individual is attained when the conditions of environment are most favorable to the life of the species. 2. The largest species of a group (genus, sub-family, or family, as the case may be) are found when the group to which they severally belong reaches its highest development, or when it has what may be termed its centre of distribution. 3. The most typical or most generalized representatives of a group are found also near the centre of distribution, outlying...
Seite 255 - ... tubercles of the primitive triangle, together with the extinction of the heel. The modification in the character of the dentition, taken as a whole, was shown to consist in the reduction In the number of the teeth, including the sectorials...
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 association...
Seite 190 - The tendency toward uniformity affords the basis for the correlation of terranes by comparison of fossils ; the tendency toward diversity limits the possibilities of correlation. If now we direct attention to some limited area and study its geology, we find that under the operation of these general processes it has acquired a stratigraphic constitution of a complex nature. Its successive terranes are varied in texture. Breaks in the continuity of deposition are marked by unconformities. The fossils...
Seite 221 - ... earlier, much longer continued, and accompanied by much greater submergence, than the epoch of cold represented by the newer deposits; and it has been inferred from the relative erosion of water-ways since the two deposits — Columbia and latest-glacial — were formed that the interval of mild climate and high level of the land between the two epochs of cold was from three to ten times as long as the post-glacial period. These inferences are fully sustained by a long series of observations...
Seite 301 - Every day the progress of civilization, ruthless of the monuments of barbarism, is destroy ing the feeble vestiges of the ancient race ; mounds are levelled, embankments disappear, the stones of temples are built into factories, the holy places desecrated. We have assembled here to aid in recovering something from this wreck of a race and its monuments ; let me urge upon you all the need of prompt action and earnest work, inasmuch as the opportunities we enjoy will never again present themselves...