IT is still not known what causes the passage of fluid from the cytoplasm into the contractile vacuole of a protozoan. In a recently published paper 1, Picken has claimed that the rate of this ” ...
I HAVE just read W. Stempel's paper, “Ueber die Funktion der pulsierenden Vacuole,” to which Prof. Bayliss kindly directed my attention in NATURE of November 18, p. 376. Stempel's idea as to how the ...
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