I'm the one who asked that. Thanks - I wondered. Here is the quote from the book that I am using Hergenhahn: "While in the army, he was able to build a small laboratory and to continue his early research, which concerned metabolic processes in the frog. Helmholtz demonstrated that food and oxygen consumption were able to account for the total energy that an organism expended. He was thus able to apply the already popular principle of conservation of energy to living organisms." That isn't the only text that suggested that connection (although I have no idea where I read it first).

At 10:51 AM 9/29/2005 -0400, you wrote:
Yesterday on TIPS, someon asked about hos Helmholtz wenst about measuring the amount of energy put into and expended by a frog (to prove conservation of energy in living things). I've done a bit of searching and consulting over the past day, and it appears at this stage of my investigation that there was no such experiment conducted by Helmholtz. His work on conservation of energy (1847 -- see my "Classics in the History of Psychology" site) was theoretical. There may have been (much) later experiments done by others along the lines suggested, but I have not been able to find exact references. Helmholtz's primary work with frogs involved his measuring the speed of neural transmission, not conservation of energy. The two ideas may have become confused with each other (as with many of these popular historical myths), resulting in the idea of an experiment on conservation of energy involving frogs.

Regards,
--
Christopher D. Green
Department of Psychology
York University
Toronto, ON M3J 1P3

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Dr. Deborah S. Briihl
Dept. of Psychology and Counseling
Valdosta State University
Valdosta, GA 31698
(229) 333-5994
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