(< 7 ^) 
mg of many both familiar and abftru kPhanmem pf Nature 5 but 
alio, upon the fcore of its PraUical life, lines the Proportions, it 
teaches, may be of great importance to Navigation , and to thole 
that inquire into the Magnitudes and Gravities of Bodies , as alfo 
to them , thardeal in Salt-works : Befides , that the Bydrofiaticki 
may be made divers waies ferviceable to Chymifls 0 as the Author in- 
timates^and intends to makemanifeft, upon feveral occafions, in 
his yet unpubliffitf part of theiy efulnefs^of Natural and Experimen- 
tal Philo fophy. 
Thefe Propofitions are fhut up by two important Appendixes^ 
whereof the one contains an Aufwer to feven Objections by a late 
learned \Vnter,to evince, that the upper parts of water prefs not 
upon the lower , the other 3 folves that difficult problem , why Vrina- 
tors or Divers 9 and others, who defeend to the bottom of the Sea, 
are not oppreffed with the weight of the incumbent water?where 5 
among other folutions, that is examined,which occurs in a printed 
Letter of Monfieur des Cartes Jowl is found unfatisfaCfory. 
1 1. Nicolai Stenonis de Mufculis & Glandulis Obfervationum [pen- 
men j cum duabus Bpiflolis Anatomicis. In the [pecimen it felfthe Au- 
thorffiavung described in general ,hoth th &StruUure and the FunUion 
of the ^/ir/#j,applies that defeription to the Hearty to demonftrate 
that that is alfo a true Mufcle-.ObfervmgfirJl^thaz in the fubftance of 
the Heart there appears nothing but Arteries , Veins, Nerves 5 Fibres , 
Membrans -, and that that,& nothing elfe is found in a .Mufcle-, affir- 
ming withall,that which is commonly taught of the Mufcles , and 
particularly of the Heart ' j Parenchyma , as diftinCt from Fibres , is 
due 5 not to the CV«/ih 5 but the Wit of Anatorhifts : fo that he will not 
have the Heart made up of a fubftance peculiar to it felf, nor con- 
fidered as the principle of Innate heat, or of Sanguification, or of vi- 
tal fpirits. He obferves rc^,that the Heart performs the like opera - 
tion with the Mu/cles , to wit,to contract the Fleffi j which aCtioa 
how it can have a different caufe from that of the Contraction 
made in the Mu(cles\ where there is fo great a parity and agree- 
ment in the Vefiels^ he fees not. And as for the Phenomena , that 
occur,of the Motion of the Heart,he undertakes to explicate them 
all, from the DuUus or Pejition of the Fibres $ but refers for the per-* 
formance of this undertaking to another Treatife , he intends to 
publiffi. f ;.n'; r*: d'-o-; ■ 
As to his Obfervations abom Glanduls 5 he affirms, that he has 
been the Firft,that has difeover d that Veffel, which by him is call’d 
Salivate, 
