. The biology of the Protozoa. Protozoa; Protozoa. PHENOMENA ACCOMPANYING FERTILIZATION 521 shortening of the long axis of the crescent. Calkins and Cull (1907) and Dehorne (1920), however, find that the division center or achromatinic substance which forms the poles of the spindle. ( mB-^. 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, New York, Lea & Febiger

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Keywords: ., bookauthorcalkinsgaryngarynatha, bookcentury1900, bookdecade1920