[ *4 3 
gures; whofe two oppofite Parallels, in the Place 
where they comprehend acute Angles with the other 
Parallels, are ftretched to the oppofite Parts without 
the Angles. Here he makes a Remark, That in every 
Tendon, tho’ never fo (lender, there are as many 
filaments as there are ficfhy Fibres in the Belly of the 
Mufeie ; and the interior Filaments are fhorter than 
the exterior. 
6. His fixth Conclufion is taken up in the Divi- 
fion of a Mufeie into Extremities and its Middle, 
with fome Animadverfions on that Head. 
7. He fays alfo, That a Membrane not only goes 
round each Mufeie with a tranfverfe Direction of its 
Fibres, but that it alfo infinuates itfelf in the fame 
manner between every mufcular Fibre. 
XIX. 
When he comes to (peak of the Adion of a Muf* 
cle, he confeffes ingenuoufly, that he cannot attempt 
explaining the Caufe or Manner in which it is per- 
formed ; yet makes a Comparifon towards an Expla- 
nation, which he thinks not improper, but wherein, 
I muft fay, I cannot find any Satisfadion. Imagine, 
fays he, a Machine for driving Piles into the Ground 
drawn up by feveral. Men, each having his particular 
Cord which is fatten'd to the main Rope : The Cords 
imitate the Tendons ; the Weight fixed to the Cords, 
the moveable Part - y and the Men , the ficfhy Fibres : 
For, fays he, as Men (being render’d fhorter while 
they pull their Cords) move the Weight, fo the ficfhy 
Fibres, being contraded, by drawing the Tendons, 
puil the moveable Part. There is no more under- 
flood by this Comparifon, than that the Contradion 
of 
