. Senescence and rejuvenescence. Age; Reproduction. i6o SENESCENCE AND REJUVENESCENCE hundred individuals of Planaria dorotocephala in various stages of starvation, and in all cases the susceptibility has been found to increase during starvation. In P. velata also the susceptibility to cyanide has been found to increase during starvation. This species does not undergo reduction in size as rapidly as P. doroto- cephala, but the effect of starvation is essentially the same in both. If the susceptibility of these animals is in any degree a measure of Stages Hours. 1234507s 9 Fig. 57.—Susceptibili
. Senescence and rejuvenescence. Age; Reproduction. i6o SENESCENCE AND REJUVENESCENCE hundred individuals of Planaria dorotocephala in various stages of starvation, and in all cases the susceptibility has been found to increase during starvation. In P. velata also the susceptibility to cyanide has been found to increase during starvation. This species does not undergo reduction in size as rapidly as P. doroto- cephala, but the effect of starvation is essentially the same in both. If the susceptibility of these animals is in any degree a measure of Stages Hours. 1234507s 9 Fig. 57.—Susceptibility of Planaria dorotocephala to KCN mol. in relation to nutritive condition and age: ab, dashes, well-fed, growing animals; ab, unbroken line, animals reduced by starvation from 20-24 mm. to 7-8 mm.; cd, animals from the same stock and of the same size at the beginning of the experiment as the starved animals, but which have been fed while others were starving. physiological age, the starving animals certainly undergo rejuvenes- cence, the degree of rejuvenescence varying with the degree of starvation and reduction. THE PRODUCTION OF CARBON DIOXIDE BY STARVED ANIMALS The invention of the Tashiro biometer (Tashiro, '13) has made possible a direct estimation and comparison of carbon-dioxide. 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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