. The biology of the protozoa. Protozoa; Protozoa. VITALITY 283 continue indefinitely (see Child, Hartmann, Belaf, Jollos, etc.). Such is the explanation that I would give of continued life without fertilization of animal flagellates, aided here possibly by changes which may take place during the periods of encystment. On the same basis we find an explanation of the long-continued isolation cultures without fertilization of organisms which, under usual conditions, undergo fertilization. Some types of organization are evidently able under appropriate conditions of the environment to return to t
. The biology of the protozoa. Protozoa; Protozoa. VITALITY 283 continue indefinitely (see Child, Hartmann, Belaf, Jollos, etc.). Such is the explanation that I would give of continued life without fertilization of animal flagellates, aided here possibly by changes which may take place during the periods of encystment. On the same basis we find an explanation of the long-continued isolation cultures without fertilization of organisms which, under usual conditions, undergo fertilization. Some types of organization are evidently able under appropriate conditions of the environment to return to the same labile organization after each division. Such types would thus have a prolonged asexual cycle, possibly, as Enriques asserts, as long as the observer cares to continue the culture. In such cases it is not improbable, as M. Robertson (1929). 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 Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, Lea & Febiger
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