Animal Oeconomy ; and here, in order to a general view 
of the Univerfe, he propofes Matter as the firft 
general Principle of all Bodies ; and conceives Matter 
to be the only thing we have any clear Notion of , its 
Properdts are JtvifihiUty and irrtpenetrahility^ one part 
of xMattcr difTtrs fromano.her only in bulk, motion, or 
figure, and according as it difiTers from others in one or 
more of thefe Qaalities, they will conftitute different 
Bodies- and he requires butthefe three Qualities, to 
give a general Account of the different parts of the 
World, as the tht /£t he rial. Fluid y and Terre- 
flrial Bodies : The Atoms of the firft Matter have a 
lefs Bu!k and more Motion , the Atoms of the Second 
Matter are properly Spherical, have as little Bulk but 
lefs Motion ; the Atoms of the third Matter are of an 
irregular Figure^ and mne, or z /lower Motion ihzn the 
reft - the»Sr^7rj confift of the firfr, xh^ ^therialYlmd 
of the Second, Planets and Terreftrial Bodies of the 
third : The two firft are exteriour Agents, and ra- 
ther influence a Motion into the Terreftrial Bodies, than 
enter into their Compofition. Thefe then are his Prin- 
ciples by which he explains the Phenomena of Na- 
ture. 
The laft Letter is an Account of a Latin Trcatift late- 
ly Publifr/d by the Author, called Evangelium Medici^ 
feu Medicina Myftica de fufpenfis Nature legihtu in 
which he compares fupernatural EfTecfts Philoiophically, 
with thtural ones , and explains them by the Princi- 
ples of Phyfick ; and firft he gives the reafbn of his At- 
tempt, which was to Anfvver thofe that denied the Be- 
ing of ^upernaturaLEffc^fts, becaufe they could not 
apprehend them ; in order to profecute his Defign , 
he lays down for a Bafis^ the Strufture of the Human 
Body^ 
