6 a Hcemajiatks. 
es may readily move them accordingly. I havd 
found fmall Frogs bell for this Purpofe, viz^ 
fuch as are not above -f or ^ of their full 
Growth. Stimulating the Foot of a Frog, will 
fometimes make it contraft thefe Mufcles. 
The Frog mufl: be fixed in a proper Frame. 
If repeated Obfervations were made on the 
Mufcles thus in Aftion, it might perhaps give 
fome farther Infight into the Nature of muP- 
cular Motion. 
30. It may not be improper here to takd 
notice, that having about twenty feven Years 
fince, read the unfatisfadory Conjedures of fe- 
veral, about the Caufe of mufcular Motion, ic 
occured to me, that by fixing Tubes to the Ar- 
teries of live Animals, I might find pretty 
nearly, whether the Blood by its meet hydrau- 
lick Energy, could have a fufficient Force, by 
dilating the Fibres of the ading Mufcles, and 
thereby fhortning their Lengths, to produce 
the great Effeds of mufcular Motion. And 
hence it was, as I mentioned in the Preface 
to the firft Vol. that I was infenfibly led on 
from time to time, into this large Field of fta- 
tical and other Experiments. Whence we fee 
what great Encouragement we have to fpur 
us on in thefe Purfuits 5 fince the wonder- 
ful 
