Abstract
THE physiology of encystment and excystment of Protozoa and other micro-organisms has received little attention. In the case of the ciliate Colpoda cucullus, it has been earlier shown1 that emergence from the cyst, or excystment, is brought about by some special substances present in the excysting medium, which is usually hay infusion. Part at least of the active material was shown to be ether-soluble. We have therefore subjected hay infusion to fractionation in order to isolate and identify the active excysting substance.
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