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JoH. AlphonsiBorelli 3^a^oL 
Math* Frofef. opm PoHhumHm :Vars frimay 
Kornx i6Qo, pars altera ibidem, 1681. 
THe formei: account o f this work being general and 
modeft:, nioft of it what the Author himfelf gives in 
his Preface to the Book not then publiftied, and a 
promife having been made of a more particularRelation of 
the Contentsof it^ as it well deferves s to cancel that Ob- 
ligation ( tho not made by this Publifher ) the former ac- 
count is here enlarged:* as follows. 
Ftr/h He gives an exavi: Defcription of the Mufcles, 
which within its tendinous or Nervous membrane^Containes 
fcveral fmall bundles of Fibers* vi^hich conftitute an Hex* 
agonal^ Square^ or Triangular Prifm. The Fibers themfel ves 
in each Prifm being Parallel^ and varioufly connected to 
each othe The Microfcropical appearance of a /ingle Fi« 
bre reprefenting a Cylinder^ not hollow likeai^f^^, but 
full of a fpongypith like Elder. 
He gives an account of the feveral Species of Mz^?/-?/, 
from the pofition ot their Fibers* and aflerts their proper 
adion to beContradton, adding a modeftbut folid cen- 
fureof&^;2o'sftrU(5lureofa'Mufcle^ and manner of itso- 
peration. 
He confutes the common opinion , That Nature with 
a very fmall force lifts up the greateft weights 5 the con- 
trary being demonftrated, That the^owr does a 1 00, or 
rcoo times exceed the weight of the limbs that are lifted 
up by it ; and this is the cheifSubjedof His firft part. 
To prove which He premifes thisPropofition 5 That 
theflexivc motion of ajoint is Sph^erical or Circular* or 
made on a Conical fuperficies, about an imaginary center. 
Andlayes down this general Rule to diftinguifli them by* 
