Note W — Chapter XI · DEVELOPMENT OF THE REPRODUCTIVE IMPULSE
Reading edition
M. Maupus (Archives de Zoologie expérimentelle, 1889) has shown that without conjugation, the members of an isolated family of infusoria eventually cease to feed and divide and pass through the stages of degeneration and senility to extinction. (In the train of conjugation there is always death. Non-conjugating protozoa are immortal. Eve and Death.)