Portrait of Hermann Ludwig Ferdinand von Helmholtz, who studied physiological phenomena, paving the way for acceptance of the basic principle of energy conservation in physiology.
Photograph of Hermann Ludwig Ferdinand von Helmholz from page 84 of Sharpey's Album. Helmholz was a sensory physiology. Photographed by Hugo Quaas.
Part of an album of eminent scientists, surgeons, etc. with a collection of autographed letters and 17...