Page:Collected Physical Papers.djvu/294

274 drops of diluted solution of sodium carbonate and you observe the growing exaltation of the response. (fig. 69).

I now pass on to the effect of poisons. Any of the substances already enumerated may be used as the

toxic agent. After obtaining the normal response I apply a poisonous solution of oxalic acid. The electric response is now completely killed and all our efforts, by intense stimulation to reawaken them, fail (fig. 70).