PHYSIOLOG-Y OF MAN. 



INTEODUCTION. 



General considerations Vital properties of organized structures Proximate prin- 

 ciplesInorganic principles Organic non-nitrogenized principles Organic 

 nitrogenized principles. 



THE epoch of purely speculative reasoning, without the 

 basis of established facts sufficient to justify any connected 

 theories, belongs to the remote history of Natural Science. 

 The ideas of the great philosophers of ancient times, who 

 studied Nature by what may be called the intuitive method, 

 have been gradually giving place to doctrines based on the 

 observation and investigation of phenomena. Ages of obser- 

 vation and generalization of facts by the greatest intellects 

 have put us but little beyond the threshold of the great 

 domain of Science. But we have learned enough to know 

 that all Nature is regulated by immutable laws. Students 

 of her divine mysteries should be more than content if per- 

 mitted to discover some of the truths, the development of 

 which marks the scientific advancement of each succeeding 

 age, though they may seem an insignificant portion of what 

 is to be learned. It is only by accurate observation and 

 generalization of a sufficient number of phenomena, that the 

 laws of Nature are to be discovered. They are the creation 



