[ 203 J 
currence to this. Befides, our unac¬ 
quaintance with the means employed by 
nature in producing the movements, is 
not an objection againft the principal 
objedt of our dodtrine. If the means 
are not known, it is not on that account 
lefs true that eledtricity is the caufe of the 
movements. Let another principle be 
brought forward which poffeffes the power 
of penetration neceffary for infinuating 
itfelf amongft the infinite number of muf- 
cular fibrils, which are in play during 
contradlion ; a principle which has the 
power of increafing in an enormous degree 
the force of the mufcles, by increafing the 
cohefion and attradfion of their fibres, and 
which can produce this increafe of force 
and of attradlion fo tranfient and momen¬ 
tary. Laftly, I fhould wifli the quicknefs 
and rapidity of mufcular adlion to be ex¬ 
plained by any other principle. 
What an amazing fucceffion of contrac¬ 
tion 
