IN TROD.] ANATOMICAL AND CHEMICAL ANALYSIS. 33 



we can arrive at an exact knowledge of the chemical composition 

 of the various substances which are employed in them. 



Henceforward, in physiological research, anatomical and che- 

 mical analysis must go hand in hand : the former to ascertain the 

 minute mechanism of the various processes ; the latter, to deter- 

 mine the nature of the affinities by which the syntheses and 

 analyses of the living laboratory are effected.* 



* In the composition of the preceding chapter we have to acknowledge 

 valuable aid derived from the following works : Haller, Elementa Physio- 

 logise Corporis Human! ; Barclay on Life and Organization ; Koberton on 

 Life and Mind ; Prichard on the Doctrine of a Vital Principle ; Dr. Carpenter's 

 article Life, and Dr. Alison's article Instinct, in the Cyclopaedia of Anatomy 

 and Physiology ; Remarks on Scepticism, by the Rev. Thomas Rennell ; 

 Daniell's Chemistry ; Graham's Chemistry. 



VOL. I. 



