won< 



which does qoI readily diffusi 



quickly; tl smotic flow will take place from th< 



tion to tl ane sugar even when the sodium ch 



than the sugar. In such a case, water n 

 having the higher osmotic pressure Na< 

 this is lower I sugar . 



Furthermore, the simple laws of osmoe 

 five influence of the membrane toward certain 

 becoming dissolved or adsorbed in r 

 others. Many membram 



(e. £.. rubber membranes in contact with pyrid 



and it is probable that such a property 



a not unimportanl role in tin- transferei animal 



membranes Kahlenberg 



These few conditions which may modify the dir< 

 flow, are indicated here to show how i> ich pit and 



how careful we musl be no1 to assume that. 

 ferred through a li\i 1 1 <_r membrane contrary to the simpler la 

 mosia ami diffusion, it must involve the 

 from those operating in dead membranes 



Another force comes into operation under certain c< 

 that of filtration. 'I 'his i-. ;! purely mechanical pi ich m< 



cules are forced through the pi I a filter 



aces in pressure on its two si ■ 



We are now in a ]>o->iti.in to consider in how far I 

 forces explain certain physiological problen - 



1. Is tin absorption, into tin b 

 tinal walls, of substana < in thi 



dependent up,,,, tin pi ■/ filtration, 



absorption of weak solutions of highly diflfu 

 very largely a matter of osmosis and din* 

 into the blood because of osmotic i . but * 



narily come into plaj ry elearlj 



servations. 1 1' a pi t* int< 



two ligatures on it. and the isolated lo< 

 taining the same saline constituenl 

 Berum, or better b1 ill. w ith son 

 will l»e found after some time thai 

 into the blood : the contet 



l»loo«l, e\ en though the OSmot 



the same on both sides of lie membrj • v 



The intestinal membrj 



