. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. Rate of Ageing in Drosophila suhohscura 277 except for the absence of gonads. The results of these experi- ments are shown in Fig. 3 and Table lY. As before, the exposure of normal mated females to a high temperature increased their expectation of life at 20°. As would be ex- pected from the hypothesis being tested, both virgin and ovariless females lived for longer than did the controls, and closely resembled the females exposed to a high temperature. The final confirmation of the hypothesis comes from
. Ciba Foundation colloquia on ageing. Old age; Aging; Animals -- growth & development. Rate of Ageing in Drosophila suhohscura 277 except for the absence of gonads. The results of these experi- ments are shown in Fig. 3 and Table lY. As before, the exposure of normal mated females to a high temperature increased their expectation of life at 20°. As would be ex- pected from the hypothesis being tested, both virgin and ovariless females lived for longer than did the controls, and closely resembled the females exposed to a high temperature. The final confirmation of the hypothesis comes from the fact. 16 24 32 40 48 56 64 72 80 88 96 104 112 120 Age in days Fig. 3. Survival time of females at 20°. A, normal mated females; B, ovariless females; C, normal virgin females; D, normal mated females exposed for 5 or 6 days to 31°. that the expectation of life of ovariless females, as of males, is not increased by exposure to a high temperature; since such females will not lay eggs in any case, exposure cannot further prolong their life. The greater longevity of virgin as com- pared to mated females has previously been demonstrated by Bilewicz (1953) in Drosophila melanogaster, and by Griffiths and Tauber (1942) in Periplaneta americana. It is natural to suppose that the causes of ageing of ovariless or virgin females at 20° are the same as the causes of ageing of males at the same temperature. But these experiments leave one question unanswered. Does egg-laying shorten the life. 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 Ciba Foundation; Wolstenholme, G. E. W. (Gordon Ethelbert Ward). Boston, Little, Brown
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