He declared that `` experiments on entirely conclusive for the toxicology and hygiene of effects of these substances are the same on man as on animals , save for differences in degree '' . Because of Bernard , animal testing became a regular scientific method . Arguing that `` experiments on animals ... are entirely conclusive for the toxicology and hygiene of man ... the effects of these substances are the same on man as on animals , save for differences in degree , '' Bernard established animal experimentation as part of the standard scientific method .