(^27) 
whereas in the doftrine of P^ri:/#o« feveral things are to fee accurately 
diftinguifht, the Force percuffive, the Motion, or the Velocity of the Per- 
cuffion, and the of the Body percuffed ^ and then anEftimate 
to be made of the Proportion thofe three to one another s ThisAuthour 
pretends to have both affigned that difference, and demonftrated the Vro^ 
portion-^ Adding, thatJthough GaliUo(m and acknowledged (vid,u the 
End of his fouKh Dialogue De Mot a VrojeBorf{r/?)That the Force ofVercuJJh 
on was Infinite, or (rather) unlimited^ yet he there referred difcourfing up- 
on that Argument to another opportunity ^ which not having been per- 
formed by him (ioic ought could be found by any of his writings, either 
Printed or Manufcript, which latter were purpofely fearched after his death 
to find fuch a difcourfe) our Authour pretends, that that Proportion con- 
cerning the Jnfinitenefs of the force of^ercujfion, not having been yet demon- 
ftrated by any, he hath in this Book^ refumed the whole matter concerning 
Vercujjion^ and clearly demonftrated the true and genuine Nature of it, its 
Caufe, Proprieties and EfFeds; In the doing of which, he takethoccahon 
to difcourfe alfo of Gravity^ Magnetifme^ Tremor of Bodies, Pendulums^ &c. 
All which, whileft the Reader is confidering, the Authour tells him, that he 
is making ready his other Books concerning the Motions of Animals^ 
IV. NIC\ STENONIS MVSCVLI DE SCRIPT 10 GEOME- 
TRIC A, F lor enti^ in ^o, An,i66j> 
The Author of this 5oo)^declareth, that his defign in compofing it was, 
£0 fhew,that in a Mufcle neither the Parts of it can be diftindly named-nor 
its Motion duely confider'd, unlefs the Doftrine thereof become a part of 
the Mathematicks. And he is of opinion, that there is no other caufe of 
the many Errors, which fpoil the Hiftory concerning the jFJ^»^^;^^^^?^, 
than that hath hitherto difdaind the Z^^Wx of the Mathematickj, 
And therefore in viteth thofe that are ftudious in that part of Philofophy, to 
confider, that our Body is an Engine xmdexx^o't s. thoufand fubordinacc 
Engins, whofetrue knowledge whoever thinks that it can be invedigued 
without Mathematical affin:ance,muft alfo think, that there is matter mdv 
Oi\i"ExtenJlon^ zndi^Qd'^Withoxxt Figure, 
Hereupon he fliews, that the very F^il^y/c^ of the Mufcles impofcth a kind of nccefllty 
on confidering V^viievs 10 explicate them MatbematicniUj/ : In conformity whereunro 
he pretends to have found, that in every Mufde there is One ParalUlepipei o( Vkfh,, 
and Two Tetragonal Prifmesoi Tendons j 6c£nln^aMufcl£ to bs a Body compofedof 
diversferies'sor ranks of Fibers equal, likc> and parallel among themfclves> and lo im- 
mediately placed upon one anothcrj that whole ranks are congruous to whole ranks. Here 
he explains the Vimenfions of a Mufclej-its Contraftionj pnd Strength, and adds that the 
fife of thU new difcovery of the ftrudure of the Mufcles, is, to demonftratej That ihey 
miy fwell in their Contra^ion without the Acceflion of new matter. 
He ftibjoyns a Letter to Monfieur Thevenot, in which, among other things, he , Hedges 
feveral Experiments, to fliew, that the Motion of the Heart is h'ke the Motion "^of 
^/;^fdf 5 J and anfyvers ihorrj who pretend that the true Fabrickof the Hr,n-^hath already 
