Page:Researches on Irritability of Plants.djvu/116

Rh without the abolition of its excitability. The effect of the gas is very different when it contains impurities such as sulphuretted hydrogen. I give a record (fig. 51) which

exhibits the depressing effect of coal gas, and the gradual restoration of normal excitability on admission of fresh air.

The vapour of chloroform acts as a very strong narcotic. In the record here given (fig. 52) the response became very