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among the former, of fome which have 
drawn a weight feventy or eighty times 
greater than their own. (Vallifneri ) 
The degrees of this force increafe under 
particular circumlfances, as, for inlfance, 
when the animal is agitated and put in 
aflion by the paffions and emotions of the 
mind, as anger, fear, defire, emulation, 
&c. 
It increafes in convulfions, fo that a 
boy or girl of delicate conftitution isfome- 
times more than equal to the combined 
Jlrength of feveral grown perfons. 
Again, if is prodigioufly increafed • in 
maniacs and idiots, who have been found 
capable of breaking, by a fingle exertion, 
a chain of iron, which might have refilled 
the united efforts df a couple of horfes. 
Our furprife will not be leffened if we 
confider that the major part of the mufcles 
I 
have their point of refinance near the hy- 
pomochlion: That they are inferred at 
very acute angles. That 
