ABSTRACT
In a short communication to the British Association at Leeds (1927) Saunders pointed out that the average number of vacuoles ingested by Colpidium in a given time, when fed with suspensions of Indian ink, varied with the H-ion concentration. The present series of experiments represent an attempt to analyse in greater detail the effect of the hydrogen-ion concentration on Colpidium, particularly in respect to its effect on the formation of food vacuoles. The work was carried out under the direction of Mr J. T. Saunders, to whom I owe my thanks for much help.
1
Aquadag is a suspension of colloidal carbon in which tannin and ammonia are employed as the dispersing agents.
Copyright © 1931 The Company of Biologists Ltd.
1931
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