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XV.—Observations on the Development of the Proteus Group of Amœbæ*

Published online by Cambridge University Press:  11 June 2012

Monica Taylor
Notre Dame College and Zoology Department, University of Glasgow.
Catherine Hayes
Notre Dame College and Zoology Department, University of Glasgow.
Mary Galbraith
Notre Dame College and Zoology Department, University of Glasgow.
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Details of what occurs in the interval between the hatching of amœbulæ from the spores of the Proteus group of amœbæ to the attainment of the adult condition (4–6 months) not hitherto known are described. The method consists in removing mature adults to petri dishes 4 in. in diameter, containing a dilute inorganic fluid which causes sporulation. The subsequent development of the hatching amœbulaæ can be traced in situ by means of a 4·4 mm. water immersion lens, and is seen to consist of feeding and growth alternating with periods of encystment. The time spent in cysts greatly exceeds that of activity.

Some account of what takes place when cultures of the Proteus group, allowed to dry to a brownish dust, and then wetted, is given. Only in the case of A. proteus have the amœbulæ, which hatch out from the spores, been grown to maturity. It has been shown that the dried cultures used may comprise (1) spores, (2) cysts of varying size from which arise amœbulæ likewise varying in size.

Research Article
Copyright © Royal Society of Edinburgh 1957

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This paper was assisted in publication by a grant from the Carnegie Trust for the Universities of Scotland.

Throughout this communication Jepps (1956) has been followed in the use of the terms cyst, spore and Proteus group.


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