76 BIOLOGICAL PHYSICS 



involves the liquid or more solid elements of the fluid, 

 under either, or both, of which conditions the indications 

 are, in a word, to obtain and maintain the " freedom of 

 exit." 



As types of the pathological conditions resulting 

 respectively from a disturbed condition of the pituitary 

 and serous elements of the cerebro-spinal fluid respectively, 

 we would mention acromegaly and acute rheumatism. 



