LYMPH FLOW 



41 



skin are bathed by solutions having the same osmotic 

 pressure. 



One often finds skins through which, soon after their re- 

 moval from the frog, fluid does not immediately diffuse when 

 they are filled with Ringer's solution isotonic with frog's 

 blood and are suspended in the same solution (fig. 3). In 

 such cases it has been found that the presence or absence of 

 K in the Ringer's solution contained in the glove does not 



influence the behavior. After a more or less prolonged sus- 

 pension of the glove in Ringer, however, a transport of fluid 

 through the skin is usually initiated, and the weight of the 

 glove containing Ringer in which K is present then increases 

 at a greater rate than that of the glove containing Ringer in 

 which K is absent. In other words, only in the case of skins 

 in which a transfer of fluid is actually being accomplished is 

 the behavior of the glove influenced by the presence or absence 

 of K in the solutions. An example of this form of behavior 

 is illustrated by the following experiment. 



