CONTENTS. 



ON the phenomena accompanying the mixture of two 



liquid^ separated by a membrane Page 1 



Relation of porous bodies to water and other liquids ... 2 

 The moistening of porous bodies depends on capillary at- 

 traction ... ... ... ... ... ... ... 4 



Pressure required to cause liquids to pass through mem- 

 branes ... ... ... ... ... ... ... 6 



The pressure varies with different liquids ... ... ... 7 



The absorbent power of the membrane has a share in the 



effect 8 



Action of brine, oil, alcohol, &c., on moist membranes ... 10 

 Cause of the shrivelling of membranes when strewed with 



salt 12 



Animal tissues are permeable to all liquids ... ... 15 



Saline solutions, alcohol, &c., mix with water through 



membranes ... ... ... ... ... ... 16 



Change of volume when two dissimilar liquids mix through 



a membrane ; Endosmosis ... ... ... ... 17 



This change of volume does not depend alone on the dif- 

 ferent densities ... ... ... ... ... ... 18 



Phenomena of the mixture of two liquids through a mem- 

 brane 20 



The mixture is the result of chemical attraction . . . ' ... 25 



Chemical attraction is everywhere active ... ... ... 27 



Examples. Crystallization ... ... ... ... 28 



Action of solids on dissolved matters ... ... ... 30 



Laws of the mixture of two dissimilar liquids ... ... 33 



Effect of the interposition of a membrane ... ... 38 



