LIQUIDS THROUGH A MEMBRANE. 39 



bladder, it follows, that, exclusive of all other 

 effects, the time required for mixture must be 

 lengthened by the interposition of a bladder. In 

 the absence of the bladder, the mixture would take 

 place exactly as when it is present, except in regard 

 to time. 



When the heavier brine is under, the water above 

 the bladder, the two liquids mix more slowly than 

 without the bladder. 



But since a bladder, inasmuch as a feeble hydro- in certain 



circum- 



statical pressure is not propagated through its pores, stances, the 

 allows us to place a heavier liquid above a lighter, turn of a 

 and to retain it in that position ; this circumstance ^de^tes 

 has the effect of promoting mixture, the ultimate 

 cause of which is, not the bladder, but the specific 

 gravity of the liquid. The bladder is a means of 

 enabling the specific gravity to influence mixture. 

 The foregoing remarks appear to me sufficiently to 

 elucidate the share taken by the bladder in the 

 mixture of two dissimilar liquids placed on opposite 

 sides of it. 



With respect to the change of volume in the two change of 

 liquids which become mixed through the bladders, liquids 



which mix 



we must consider, that the moistening or the ab- through a 

 sorbent power of a solid body, as well as the power 

 of a liquid to moisten other bodies, is the result of 

 a chemical action. 



Liquids of different properties, or of different is the result 



of chemical 



chemical characters, are attracted with unequal 



