658 
BIOLOGY: L. J. HENDERSON 
false representation of the process, which neglects the movements of 
water itself. Only when this is immediately evident, as in osmotic 
phenomena, is it at all taken into account. But even here the current 
explanations are often incomplete. And the general theory of the 
diffusion of water is almost useless for the purposes of physiology. 
Yet there seems to be no reason to doubt that, in the organism, this 
is the most important process of diffusion. 
1 1 am indebted to Prof. W. E. Byerly for kindly calculating the value of this difference 
which is p/k. r'^/6, where p is rate of heat production, k conductivity, and r the radius. 
2 A. V. Koranyi, Zs. Klin. Medizin, 33, 1892, and Koranyi und Richter, Physikalische 
Chemie und Medizin, Leipzig, 1908, 2, pp. 133-224. 
3 im., pp. 165, 166. 
^ Pfluger's Archiv, 74, 225 (1899). 
