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CONTENTS. PAGE 1. H I S T O R I C A L 3 9 2 2. M A T E R I A L A N D M E T H O D S . . . . . . . 3 9 3 F i x a t i o n 3 9 3 S t… Expand Contraction in Spirostomum is apparently directed by 2 antagonistic systems which respond to changes in free calcium… Expand The effects of vibratory and electrical stimulation on habituation in the ciliated protozoan, Spirostomum ambiguum , have been… Expand 1. Spirostomum ambiguum fails to make the avoiding reaction at pressures of 4000 p.s.i. and over. The critical pressure is… Expand SYNOPSIS. A method is described for cultivation of large numbers of Spirostomum ambiguum, calcified intracellularly with… Expand SYNOPSIS. Electron-microscopic observations of Spirostomum ambiguum have demonstrated additional details of superficial and deep… Expand