The Problem of Age, Growth, and Death: A Study of Cytomorphosis, Based on Lectures at the Lowell Institute, March, 1907 |
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adult amitosis animals atrophy baby become birth blood corpuscles body bone brain cartilage cerebellum chick child condition CURVE SHOWING cycle cytomorphosis Daily Per Cent Daily Percentage Increments decline differentiation EDWARD LEE THORNDIKE embryo entoderm fact fibrils figures function fundamental germ cells gland grow guinea-pig hair half days human illustrations increase Increments in Weight intestine layer lecture living mammals material Metazoa Metchnikoff microscopic millimetres mitotic months muscle fibres nature nerve cells nucleus number of cells observations occurs old age organism ovum period phenomena physiological picture power of growth present problem produced Professor progress protoplasm Protozoa rabbit rabbit embryo rapid rate of growth recognise regeneration rejuvenation represents result retina Richard Hertwig salamander Science scientific SECTION segmentation senescence single cell skin spinal cord stage structure substance SYNCYTIUM theory thing tion tissue Ueber unicellular various volume Yearly Percentage Increments young
Popular passages
Page 250 - First, rejuvenation depends on the increase of the nuclei. Second, senescence depends on the increase of the protoplasm, and on the differentiation of the cells. Third, the rate of growth depends on the degree of senescence. Fourth, senescence is at its maximum in the very young stages, and the rate of senescence diminishes with age.