Note 19 — Chapter X · Rational Experiment in Research

The entirely negative results of all experiments made upon the lower animals to determine if cholera is communicable, or where the poison resides, is demonstrated by an endless series of experiments on the lower animals made in many countries. The extent and severity of these experiments, as well as their inconclusiveness, is impartially detailed in the classic work of Hirsch, Handbook of Geographical and Historical Pathology, vol. i., pp. 476-480.