}ng of many both familiar and ^hkruk Phcenomena ^ Nature ; but 
alio, upon the <'corc of its Fratiical ufe^ fii^e the ^ropofitions , it 
teaches, may be of great importance to Navigation , and to thofg 
that inquire into the Magnitudes and Gravities of Bodies , as alfb 
to them, that deal in Salt-works : Befides, that the /:/y^r^j!?^/rV^x 
may be made divers wales ferviceable to chjmifis^^s the Author in- 
timates^and intends to makemanifeft, upon feveral occafions, in 
his yetunpublifticparcof ihtVfefulnefjof Natural and Experiment 
tal Philofopby. 
Thefe Propofitions arc fliut up by two important Appendixes ^ 
whereof the one contains an Anfwer to feven Objections by a late 
learned Writer^to evince, that the upper parts of water prefs not 
upon the lowei - the Qther-i folvcs that diiEcult problem^ why Vrina' 
tors or Vtvers^ and others, who defcend to the bottom of the Sea, 
are not opprefTed with the weight of the incumbent water.^where, 
among other folutions, that is examined^which occurs in a printed 
Letter of Monfieur des Cartes^hul is found unfatisfacStory, 
1 1. Nicolai Stemnis de Mufculis (S Glandulis Obfervatiomm fpeci^ 
mens cum duabus Epiflolis Anatomicis. In the fpecimen it felf,the Au- 
thor,having defcribed in^^'72^r^z/,both th^]StruUure and the FunUion 
of the Mufeles^^i^^Wts that defcription to the Heart^to demonftrate 
that that is alfo a true MufckiOhkrv'mgfirJl^ihzx. in the fubftance of 
the Heart there appears nothing but Arteries, Veins^ Nerves^ Fibres^ 
Membranf '.md that that,6c nothing elfe is found in a Mufcle-, affir- 
ming v/ithall^that which is commonly taught the Mufcles , and 
particularly of the Heart's Farenchyma^ as diftincJi from Fibres , is 
duCjUOt to the Sehfes^xxX. the Wit of Anatomijis : io that he will not 
have the Heart made up of a fubftance peculiar to it felf, nor con- 
fidered as the principle of Jmate heat^or of Sanguification, or of vi- 
tal fpirits. He obferves next.xhzt the Heart performs the like opera* 
tion with the Mufeles ^ to wit^to contradt the Flefli 5 which adrioa 
how it can have a different caufe from that of the Contradlion 
made in the Mufeles ^ where there is fo great a parity and agree- 
ment in the Vefiels^ he fees not. And as for the Phmwmena , that 
cccur^of the Amotion of the Heart^he undertakes to explicate them 
all,frora the DuBus or Fejitionoi the Fibres \ but refers for the per-^ 
formarice of this undertaking to another Tr^^^//<? , he intends to 
pubhfh 
^ As to his Obfcrvations abous Glanduls 5 he affirms, that he has 
been the Faft^thac has difcovefd that VciTel, which by him is caird 
Salivare, 
