66 PROTOPLASM. 



material more permeable to fluids, and thus facilitate the 

 access of pabulum to the germinal matter. They are often 

 useful in cases where there is shrinking and wasting of 

 textures which in the normal condition consist principally 

 of germinal matter. Potash, soda, lithia, and their car- 

 bonates, as well as the salts of many vegetable acids which 

 become converted into carbonates in the system, act bene- 

 ficially in this way, as well as by producing favourable 

 changes of other kinds, 



