The rheoscopic frog and the study of animal electricity.
D000818:Animals; D001674:Bioelectric Energy Sources / Q000266:history*; D005602:France; D005858:Germany; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D007558:Italy; D009119:Muscle Contraction; D011898:Ranidae / Q000502:physiology*