The American Naturalist, Volume 54

Couverture
Essex Institute, 1920
 

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Page 27 - General diseases. II. Diseases of the nervous system and of the organs of special sense.
Page 7 - Papers from the Department of Biometry and Vital Statistics, School of Hygiene and Public Health, Johns Hopkins University, No.
Page 128 - Reformation, culminated in the latter half of the eighteenth and the early part of the nineteenth centuries in the immense development of the Methodists.
Page 334 - ' botanical instinct ' ' of some caterpillars that has frequently been commented upon would appear to be an exaggerated power of recognition of this sort. 3. A similarity in the immediate environment or general form of the food-plant. The effect of something of this sort is seen particularly in oligophagous and also polyphagous caterpillars feeding mainly on trees or shrubs, such as the gipsy-moth, Cecropia moth, etc., and those of certain species like some of the Arctiid moths that feed upon a...
Page 315 - I have been able to devote comparatively little study, is rather summary, but every attempt to attain 1 Contributions from the Entomological Laboratory of the Bussey Institution, Harvard University. No.
Page 147 - Some of the various defects in guineapigs described by Stockard and ascribed to the inherited effects of alcohol treatment of the original parents, have symptoms somewhat resembling those of congenital palsy. His descriptions of the symptoms and behavior of his animals are, unfortunately, inadequate for detailed comparison of our cases with his. One point seems certain, however, namely, that while the symptoms exhibited by our animals are relatively constant, he has obtained in his affected lines...
Page 34 - In the United States, during the decade covered, more deaths resulted from the breakdown of the respiratory system than from the failure of any other organ system of the body. The same thing is true of England and Wales. In Sao Paulo the alimentary tract takes first position, with the respiratory system a rather close second.
Page 42 - Taking a general view of comparative anatomy and embryology it is evident that in the evolutionary history through which man and the higher vertebrates have passed it is the ectoderm which has been most widely differentiated from its primitive condition, to the validity of which statement the central nervous system furnishes the most potent evidence. The endoderm has been least differentiated in the process of evolution, while the mesoderm occupies an intermediate position in this respect.
Page 41 - States indicate roughly the rate of progress such measures are making, looking at the matter from a broad biological standpoint. In reference to the respiTABLE 2 SHOWING THE RELATIVE INFLUENCE OF THE PRIMARY GERM LAYERS IN HUMAN MORTALITY (Items 64 and 65 charged to ectoderm) TABLE 3 SHOWING THE RELATIVE INFLUENCE OF THE PRIMARY GERM LAYERS IN HUMAN MORTALITY (Items 64 and 65 charged to mesoderm) ratory system there was a decline of 14% in the death rate between the two periods.
Page 31 - For in the first place in many accidents there is no factor of contributory negligence in fact, and in the second place in those cases where such negligence can fairly be alleged its degree or significance is undeterminable and in many cases surely slight. Senility as a cause of death is not further classifiable on an organological basis. A death really due to old age, in the sense of Metchnikoff, represents, from the point of view of the present discussion, a breaking down or wearing out of all...

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