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IGEORGII SINCLARI ARS NOFA &MAG' 
NA G R AF IT AT IS et LBVIT AT IS, Ro. 
terodami in A, i66p. 
THe Argomencox^shis Book is the Sprhg and Prejfure of 
the Air ^ together with fome. Cooiiderat'oos rouchiog 
the Weight ^nd freffureoi Wafer ^ as alfo conc^mieg tV^icuum^ 
tht^&c&soiFumfs^j iiQm PcndukjHs , HJgrdfcopes d'c. 
Whether the Dodike or Expeiimcnts , heredeiivei'd , be 
nm and unheard of ( as the Author is plsafed to think ^ they 
for the moft part are ) we leave to the weli^read and lacelligenc 
to Judge, Only we find ourfelves obliged to take notice that 
that excellent Treatife of theHonorable Robert Bojle^ entitled. 
New Experiments Phyftco-Mechanicall , touching the Spring of the 
Air mi its Bff€£isj wa^ printed years before chat time, 
about which; (ihe Author/ of this Book faith ^ in his Preface to 
the Reader j fte came to London , and there committed his tl en 
un-printcd papers to the Cenfure of the Philofophical Coiledg 
there , meaning the RoyaU Society y oi whom he complains ia 
thefaid Preface^ pag. 2. that he expeded an Anfv\-er from 
them for almoft two years in vain 5 adding, that he afterwards 
found, in divers Books printed in Englifb^ many things taken 
out of his Manufcripr. 
But to undeceive the Reader in this part: caiar, wefliall fir (I 
defire him 5 to compare the date of the Edition of Mr Boyles 
Book above-mentioned with that of the Timeof this Authors 
vlCiting London y znd thtve expoRaghis Manufmpt-^ that done, 
it willeafily appeare^ which party hath the priority in the Ex- 
plication of this Dodrine touching the Air where it muft not 
be left un- mentioned 5 ihztMt Sinclair ^ when he was in Lon- 
dm, in his vifits of Mr, Boyle difcourfed much with him on 
that fubje(ft , and by his dwn acknowledgment 5 then made to 
that Gentleman , recieved much light from him concerning the 
fame. Secondly , we lhall take notice , that 'tis fo great a mif- 
take, that this Author commended his Manufcript to the Jadg- 
meat of the R, Society, that 'tis not fo much as mentioned a^y 
Q CCCQ where 
