[ x19 ] 
lives changes within his body int8 
a fubftance which has nothing de- 
leterious in itfelf, but in one place 
of its body a moft virulent poifon 
is elaborated from it. The fame 
juice which the root of a tree pumps 
from the earth is changed into va- 
rious fruits, very different in tafte 
and qualities, if different fort of 
fruits are grafted upon it. An ani- 
mal body becomes a manure for 
plants by corruption; it changes 
thus in the fubftance of a vegetable ; 
this, being burnt, changes into 
afhes; which, by the action of the 
fame fire, and by the addition of 
fome fand and fome calx of lead, 
changes into fine tranfparent glafs. 
Thus what is now a part of our 
body may become in a fhort time a 
3 os ey 
1 4 The 
