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Journal of Experimental Biology 13,387-392 (1936)
Published by Company of Biologists 1936

A Note on the Mechanism of Salt and Water Balance in the Heterotrichous Ciliate, Spirostomum ambiguum

L. E. R. PICKEN ¹

¹ Zoological Laboratory, Cambridge

1. Vapour pressure measurements on Spirostomum ambiguum suggest that the concentration of the body fluid is at least equivalent to an aqueous solution of 0.15 per cent. sodium chloride.

2. The colloid osmotic pressure (calculated) of the body fluid varies from c. 0.5 to 5.0 cm. of water and has an average value of c. 2.0 cm. of water.

3. The hydrostatic pressure varies from 3 to 7 cm. of water and has an average value of c. 4 cm. of water.