74 STUDIES IN ADVANCED PHYSIOLOGY. 



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part of the sugar is carried to the salty side and part of the 

 salt to the sugary side. These currents continue so, sec- 

 ondary causes not preventing, until the proportion of sugar 

 and salt are the same throughout. In an exactly sim- 

 ilar way the plasma of the blood containing in solution a 

 number of nutritive substances passes through the wall of 

 the capillary into and between the tissues, where these 

 nutritive substances are being continually taken up by the 

 tissues, and so an equilibrium never established. On the 

 other hand, a number of waste products which are formed 

 in the tissues pass into the blood. 



