) 
: \ , .. 
[ 182 ] 
Different effeCts will occur in thefe 
changes according to the difference of the 
ftruCture, difpofition and connection of 
thefe organs. 
A mufcle in contraction does not prefs 
upon the blood-veffels (vide Halleri Phy- 
fiol. tom. iv. lib. x. Mot. Animal), fo 
that circulation is not interrupted or al¬ 
tered, and confequently the temperature 
of the mufcles remains the fame. 
Neither does their bulk experience any 
change, the thicknefs of the mufcle in- 
creafing in proportion as its length di- 
minifhes. 
Dodtor Blane, in order to verify the lat¬ 
ter circumftance, placed half a live eel in 
a bottle, the neck of which by means of 
I 
flame directed againfl: it by a blow-pipe, 
he foftened, drew out and reduced to the 
fize of the Item of a thermometer. He 
then filled it with water, and by the in¬ 
troduction of a wire, irritated the portion 
of 
