( «$>8 ) 
Upon thus obferving that the mufcular Fibres of 
Fifties were much larger than thofe of Beads, I fet 
my felf to confider, for what Reafons the great Crea- 
tor of the Univerfe had made this Difproportion be- 
tween them. All the Satisfaction I could meet with, 
in my Thoughts upon this Subjed was that 5 as the 
Fifii fwim in the Water, their mufcular Fibres need 
to exert very little force, in order to fupport their 
Bodies in the Water, becaufe they are very nearly of 
the fame fpecifick Gravity with the Element, in 
which they fwim. All the force they exert is in 
their progreftive Motion, in purluit of their Food, 
Whereas the mufcular Fibres of Land-Animals exer- 
cife a great force, not only in fupporting and moving 
their own Bodies, but in carrying Burthens and other 
Labour they are put to. And we muff allow, that 
the fmaller and finer the Fibres are, to make a Body 
of any determinate thicknefs, the flronger will be 
the Compofition, and therefore the Mufcles in Fleih 
muff be flronger than thofe ofFifh. But this I leave 
to better Judgments, 
It juflly claims our Admiration, to fee the wonder- 
ful and amazing Strudure of thefe minute Parts in 
the Mufcles of Beads and Fifh, which never enter’d 
into our Thoughts *, and no doubt there are many 
other furprifing things there inclofed, which will 
perhaps for ever efcape our Penetration. 
/ &c. 
IP. s. 
