J. LeConte on the Correlation of Forces. 319 
18th. As the matter of organisms is not created by them, but 
is only so much matter withdrawn, borrowed as it were, from 
the common fund of matter, to be restored at death; so also 
organic forces cannot be created by organisms, but must be re- 
garded as so much force abstracted from the common fund of 
Jorce, to be again restored, the whole of it, at death.* If then 
vital force is only transformed physical force, is it not possible, 
it will be asked, that physical forces may generate organisms de 
an organized fabric; the necessary condition of the existence of 
