noticeable is the alternating character of the response that took place after the application of alcohol.
Ether
The vapour of ether induces a depression of excitability as seen in the diminution of amplitude of response. The first effect of dilute ether-vapour is often a short-lived exaltation. The narcotic effect of this agent on Mimosa is feeble compared with that induced by chloroform. The
Fig. 49.—Effect of ether.
depressing effect of ether passes off on readmission of fresh air (fig. 49).
Carbon Disulphide
The effect of vapour of carbon disulphide is similar to that of ether. It induces a depression duringr the introduction of vapour into the plant-chamber; the induced depression, however, passes off on restoration by means of fresh air (fig. 50).
Coal Gas
Contrary to my anticipation, coal gas proved to be but moderately depressing in its action. I have kept the plant surrounded by this gas for more than two hours
