( (Sio^ ) 
Thirdly^mth particular Inftanccs of the Determmah nature 
of Effluviums^reduced to three Heads* f^That thefe Efflu- 
via being by Condeofation or otherwife re-uoited , they ap« 
pear to be of the ftme nature with the Body that emitted them, 
a. Weroay difcover their Deterraioate nature bj the diffe- 
rence that may focnetimts be obftrv*d in their Scnfible Qua- 
lities 5 forafGJuch as thofe Effluvia that are endowed with 
them, proceed from the fame fort of Bodies, and yet thofe 
afforded by one kind of bodies, being in many cafes ma- 
nifcftly differing from thofe that fly off from another3 this 
evident difpariiy in their cxhalatipns argues their retaining 
diftinfl: natures 5 according to thofe of the refpedive Bo- 
dirs whence ihey proceed* 3» We msy difcover this De- 
terminate nature of Effluyiums from their Effefts upon o- 
ther Bodies than the Organs of our Senfes i cbnfideriog, 
that the Effefts which certain Bodies produce on others by 
their Effluviums 3 being conftant and determinate, and of- 
tentimes very indifferent from thofe, which other Agents 
by their Emiffions 'work upon the fame and other fubje&j' 
the diftinft nature of th^ Corpufcles emitted may be thence 
fyfficiently gathered. The inflaoces produced to make oat 
this particular 5 are concluded with an Experiment (hew* 
ing to the very Eye , That Efflnma elevated without the 
help of Heat , and wandring in the Air, may hoth retain 
I heir own nature ^ W upon Determinate Bodies produce 
cffecasj that a vulgar Philofopher would afcribe to Occult 
Qualities. • - 
In ihc fecond Trsi&y containing Neiv Experiments to make 
the Parti of Fire and Flame Babk and ponderable ^ the No- 
ble author himfelf acquaints us with the Motive, Defign, 
and Parts thereof. He confider'd then , that there beioga 
very vaft difproportioo between the Diaphanous pare ot 
the. World , and the Globes fwimmiog therein^ and the 
nature of Diaphanous bodies being fuch , that when thf 
Sunor aDy other Luminous Body illuflrates them^ the Light 
does fo penetrate and mix itfelf per mimmamihihtm that 
tfere is no fenfible part of the traofparent Body un^nlighte- 
Bd| It woald be worth the enquiry, Whether a thing fo 
vaftly diilufcd as Eighth, fomet'hiog Corporeal or not 3 
and 
