(66) 
^py of the diffci^ot ways of motion in other things. Thar 
it Is not contraftcdby the fimple traftion of its Fibres ^ 
as weights are drawn up by Ropes , becaufe thq length 
of cbe nfi^ufcle would no more be ftiortned than the length 
of^he rope is , the contrary of which is evident to fenfe. 
Neither are the Fibres bent like a bow^nor do they ad by 
the removeing any impedimentby comandof the^«^>?w/ 
faculty, becaufefuch force being internal, there would be 
required almoft as much pains tol{efi^ as thereis tOi?fo^*(?« 
They are not likewife hardened by the bare Reft of their 
parts, nor contrafted by drying,as we fee Hair^SkinsXea* 
ther&e.arc by the Air.* Neither are they wrinkled into 
io\d% zSi J{eptiles are in their progreffiomthe corrugation of 
which He demonftrates to be not the caufe,but the Effeft 
of the contradion oithtir internal nmfcles. 
After all' he conclude that themufcles arecontraAed 
from the inflation of their Fibres by adventitious bodycs* 
ais it were by wedges. And '^having refufed an Incorpo- 
1^1 natural faculty for the immediate mover> as alfo any 
^er^al Suhflrance , and rejefted the bloud filling the pores 
©f the mufcles / together with the manner by which 
moiftened Ropes are contraded > He concludes That the 
Ebullition , caufadia the Mufcles by the concurrence 
of the bloud zniSucms Mefvem ^ is the immediate caufe 
of their iniumefcenGe and.coDtra£i:k>n , which he confirms 
^nd illuftrates by axgumentsand Experiments. 
He proceeds to give an account of the internal motions 
of the fluids of the body, as^ of the Ci*^ ulation of thebloud> 
and how it is continuedj^ though it feems to be interup- 
ted and broken in tbcHearip. i 
H e demonftraces the mal>6€P btDw it is mared fofWarf 
lu the J^eins efpecisHy by the help of the which 
he obferves to be riot fingte membranes* but fmafl hollow 
bladders, whofe convex end« refpeft the capillary extre- 
iiiitysof the veins,and their Orifices optntow^ds the heart. 
He relates likewife the mufculous ftruftureof the Hearts 
aodihow it differs^ from other mufcles by the wonderful 
texture 
