THE TRULY NOBLE 
PHILOSOPHER, 
ROBERT BOYLE Efq; 
Brother to the R ight Hononrable the 
Earl of Burlington^ 
SIR, 
Cannot forbear any longer to addrefs one of 
the Volumes of theje Tranfaftions to Tou , to 
vphom I moJi willingly profefs I am fin cere* 
ly devoted^ dnd who n 'h^nown to have obliged 
the learned World n>ith fo many uncommon 
Difcoveries in Nature , and fo folidly main- 
iaind the Power and V/efulnef of Experi-^ 
mental Philofophy, Andthisldobyojferif^g 
fyou thh Volume^ becaufe in it {be fides other parcels of not or s 
dinary remark^elfewhere interfperfed) two oft he Twelve Tra&s 
are almofi: entirely your own :^ of which the judicious do generally 
affirm^ that though they are draughts written only for your own 
memory y and have not yet the polifjing of your lafi hand, yet they 
contain mojl diving Re je arches into fo me of the deepeji ReceJJes of 
Nature.that ever appear d in ?uhlick\ and have mojl indufirioujly 
examind the Breath and Fuel oflifeiihe State of Air, and Water ^ 
in 
