. Senescence and rejuvenescence. Age; Reproduction. 146 SENESCENCE AND REJUVENESCENCE newly developed individuals are distinctly more susceptible than the parents, , they are physiologically younger. In the earlier stages of the bud, however, while it is still attached to the parent body and before it has developed the capacity for motor activity, its susceptibility is not appreciably different from that of adjoining regions of the parent body, or it may be even less susceptible than these regions. The fact that the increased susceptibility appears only after the asexually produced individ
. Senescence and rejuvenescence. Age; Reproduction. 146 SENESCENCE AND REJUVENESCENCE newly developed individuals are distinctly more susceptible than the parents, , they are physiologically younger. In the earlier stages of the bud, however, while it is still attached to the parent body and before it has developed the capacity for motor activity, its susceptibility is not appreciably different from that of adjoining regions of the parent body, or it may be even less susceptible than these regions. The fact that the increased susceptibility appears only after the asexually produced individual is separated from the parent. L-i Figs. 48, 49.—Two stages in the development of a bud in Hydra seems at first glance not to agree fully with the data and conclusions from other forms, but this disagreement is only apparent, and re- sults from the complication of the results by the factors of motor activity and food. Motor activity of an individual, or even of a region of the body in hydra, increases very considerably the sus- ceptibility of that individual or region to cyanide. It is very generally the case that the animals which show the greater motor activity after being placed in cyanide die and disintegrate earlier than the less active, and it has often been observed that marked. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Child, Charles Manning, 1869-1954. Chicago, Ill. , The University of Chicago Press
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectreproduction, bookyea
