WITH WATER THROUGH MEMBRANES. 17 



nishes, till at last the two liquids, separated by the 

 bladder, contain the same relative proportions of 

 salt and water. 



If the liquid in the tube contain, dissolved, other The same is 

 substances which give to it properties different from mSk^ne', 

 those of pure water, and if these solutions be mis- s im ' &c ' 

 cible with water, the mixture of them with the 

 water takes place exactly as in the case of brine. 

 This is true of saline solutions of every kind ; of 

 bile, milk, urine, serum of blood, syrup, solution of 

 gum, &c., on the one side, and pure water on the 

 other. The concentrated liquid loses, the water 

 or diluted liquid gains, in regard to saline impreg- 

 nation. 



If we fill the tube with water, and place it in a 

 vessel with alcohol, the water becomes charged 

 with alcohol, while the alcohol becomes diluted 

 with water. 



There is observed, in these circumstances, that is, Change of 

 when two dissimilar liquids, separated by a mem- wheTtwo 

 brane, mix together, a phenomenon of a peculiar liquids mix 

 kind ; namely, in most cases, a change of volume in Lldder. a 

 both liquids, while the mixture goes on. The one 

 liquid increases in bulk, and rises ; the other dimi- 

 nishes in the same degree, and consequently sinks 

 below its original level. 



This phenomenon of mixture through a mem- Endosmosis 

 brane, accompanied with change of volume, has Exosmosis. 

 been distinguished by DUTROCHET, under the name 

 of ENDOSMOSIS and EXOSMOSIS ; endosmose is the 



c 



