54 BIOLOGICAL PHYSICS 



an external and internal medium of asepticity and a way of 

 escape for injured and unfit storage materials, as well as the 

 results of neuronal tear and wear, for the greatest of all the 

 viscera, the viscus for which all other viscera exist and work, 

 the central nervous system in all its parts. It may, therefore, 

 be inferred from this enumeration of a few of its more 

 important functions and aspects that this circulation can 

 alone be maintained and effected by the provision of a 

 lymph-producing, as well as a circulatory, series of mechan- 

 isms of a most complete and elaborate description, and 

 that, therefore, any accident to, or pathological interference 

 with, it must be attended by the most disastrous conse- 

 quences. 



Thus we see, very imperfectly, but sufficiently clearly 

 for us to recognise, the necessity for regarding the great 

 principle of circulation^ as seen especially in the human 

 economy, as operative and essential in every vital process. 



