146 MEMBRANES (PLASMAHAUT) 



environment, definite statements cannot be made concerning the 

 causes of alterations in permeability of membranes. Phrases 

 like " selective " adsorption should meanwhile be avoided, as they 

 postulate intelligence in the cell to " select." Although the 

 unknown must be explained in terms of the known, the day is 

 surely past when it is necessary to assume a Maxwellian " demon " 

 or a cellular intelligence. It is certainly not unscientific to admit 

 the possibility that the unknown is similar to the known or may 

 be explained by analogy to known physical processes. 



Further Reading 



McClendon and Medes. " Physical Chemistry in Biology and Medicine." 

 Messrs. Saunders. 



