Abstract
RECENTLY evidence has been accumulating to indicate that cells do not multiply at a uniform rate during a 24-hour period. According to the findings of Cooper and Franklin (1940), using the mouse, and Blumenfeld (1938), working on the rat, nocturnal animals reach their maximum mitotic activity during the day and their minimum at night. On the other hand in humans whose activity is largely by day, Cooper and Schiff (1938), and Broders and Dublin (1939) found greatest mitotic activity during the dark period and least during the light.In birds, a rhythm somewhat similar to humans might be expected to occur since they are more active by day. Foley (1929), investigating spermatogenesis in the English sparrow (Passer domesticus), states, “There is positive evidence of a periodic rhythmic cycle of cell division taking place in the testes of the sparrow.” Although Foley did not indicate the number of individuals used, he .
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