(1) Senescence and Rejuvenescence (2) Individuality in Organisms

Abstract

(I) IN this able study of senescence and rejuvenescence Prof. Child gives us the fruits of fifteen years of research on the age-changes of the lower animals. Much of the book is a record of observations and experiments which have not been previously published; the rest is a thoughtful working-out of a new conception of the organism, which must be taken account of by all biologists. The most prominent new feature is the author's attempt to show that “in the organic world in general rejuvenescence is just as fundamental and important a process as senescence.” In the higher forms the possibilities of rejuvenescence seem to be very narrowly limited, and may be scarcely recognisable save in connection with sexual reproduction; but in the simpler organisms, such as the Planarian worms on which the author has published many researches, it is a characteristic feature of life.

(1) Senescence and Rejuvenescence.

By C. M. Child. Pp. xi + 481. (Chicago: University of Chicago Press; London: Cambridge University Press, 1915.) Price 16s. net.

(2) Individuality in Organisms.

By C. M. Child. Pp. x + 213. (Chicago: University of Chicago Press; London: Cambridge University Press, 1915.) Price 5s. net.