459 



reach the definite tissues. From the summit of the figure we 

 then pass downwards, through the several phases of Histo- 

 lysis, until finally, by the processes of crystallization, volatili- 

 zation, &c, the organic compounds pass again to the state of 

 simple elements. The study of this member of the scale is, of 

 course, as yet in a very imperfect condition, and it offers an 

 immense and highly interesting field for research. 



