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table differ in one very material circurn* 
fiance. An animal is equally old in all 
its parts, excepting where new parts arc 
formed in confequence of difeafes; and 
we find, that thefe new or young parts in 
animals, like the young fhoot of vegeta¬ 
bles, are not able to fupport life equally 
with the old; but every plant has in it a 
feries of ages. According to its years, it 
has parts of all the fucceffive ages from its 
firft formation, each part having powers 
equal to its age; and each part in this re- 
fpedt being fimilar to animals of fo many 
different ages.” Philof. Tranf. An. 1775. 
The author has likewife fimilar fadts iit 
his work on the Animal Economy. 
The experiments of Mr. Hunter recall 
to our recolledtion thofe of Dr. Fordyce, 
which are at once furprifing and decifive. 
The Dodtor brought fome rooms to 
different temperatures, by gradually in- 
creafing 
