272 REPORTS FROM THE SECTIONS. 
of knowledge respecting them. In cases of deformity and 
fleshy protuberances, ave heard medical men state, that 
indifferent photographs were far preferable to highly finished 
sketches. Here again I would remark that photography offers its 
assistance for the general good, and in particular for the suffering 
part of humanity. How does physiological research accept photo- 
graphy? Dr. Stein has succeeded in producing photographic re- 
cords of the pulse-beatings, tones given from musical instruments, 
and recently astonished the scientific world, by photographing 
upon a sensitive plate the sounds produced by the human voic« 
In speaking of this wonder, the Photographic News says :—‘ As 
the tones vary, so the waves of the line occupy more or less space, 
or are taller or shorter. Shrill notes or tones, where the vibra- 
tions are rapid, are represented by many steep waves ; low or bass 
tones, where the vibrations do not follow each other so rapidly, 
produce but a few waves in a line.” 
Another practical use of the camera is thus described by Mr. 
Baden Pritchard. One instance taken from the war of 1858 is 
country th 
corps. One alone 
