ON THE PHENOMENA 



ACCOMPANYING 



THE MIXTURE OF TWO LIQUIDS 



SEPARATED BY 



A MEMBRANE. 



THE constituents of the food, which have assumed The food 

 a soluble form in the alimentary canal, are thereby 

 endowed with the property of yielding to the in- 

 fluence of every cause which, in acting on them, 

 tends to change their place or the position which parts ' 

 they occupy. They are conveyed into the blood- 

 vessels, and from thence are distributed to all parts 

 of the body. 



The movement and distribution of these fluids, 

 and of all the substances dissolved in them, ex- 

 clusive of the mechanical cause of the contraction 

 of the heart, by which the circulation of the blood 

 is effected, depend, 1, on the permeability of the General 

 walls of all vessels to these fluids ; 2, on the pres- 



sure of the atmosphere ; and 3, on the chemical 

 attraction which the various fluids of the body 

 exert on each other. The motion of all fluids in 

 the body is effected by means of water ; and all 



