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. 
