Abstract

SUMMARY The following are the more important results obtained:— 1 Turgescent pith placed in water increases in length, at first slowly, then more quickly; and then again the rate of increase becomes slow. 2 The rate of increase in length increases as the temperature of the water rises, reaches an optimum, and suddenly falls as a temperature sufficient to cause flaccidity is approached. 3 The following reagents cause distinct acceleration:– Alcohol, ether, ammonia, hydrocyanic acid. The first three cause a very temporary effect, whereas prussic acid has a prolonged action. 4 The following reagents produced retardation:–Acetic acid, hydrochloric acid, and probably nitric acid. 5 Dilute solutions of quinine chloride, and of carbolic acid, produce a remarkably rapid shortening of the pith.

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