C 6101 ) 
An Account of a Book. 
Several TRACTS mitten hy the Honour ah le%ohttt Boyle § of 
the grange Subtiltf^Efficacy^ and determn^te Natnre of EF- 
FLVFlVMs i of New experiments to make the parts of FIRE 
and FLAME Stable and Ponderable 5 together "wUA feme Ad- 
ditional Experiments about Arrejiing andWeighing of Igneous 
corpufcles ; as alfo a Difcoverji of the Pervioufnefs of Glafs to 
Ponderable parts of Flame ^ with feme Reflexions on it by wav 
of Corollar^^ 
How important thefe New TraHs are tooatural Philofophy^ 
the CoDfidering Reader will foon find upon an attentive per 
ufal of thetnv 
Jo the Firfe of which, touching E^i^wi/^/, he will meet, 
F/r^j with divers Experimentsand Oblcrvations 3 proving 
their wonderful ^y^^^/Z/y, and referible tooneof the follow- 
ing Heads \m%. the ftrange Extcnfibility of fome Bodies whilft 
their parts yet remain tangible: the multitude of vifiblecor- 
pufcles that may be afforded by a fmall portion of matter ; the 
finalnels of the Pores at which the Effiuvia of fome Bodies will 
get in: Tl6e fmall decrement of Bulk or Weight, that a Body 
may fuffer by parting with great ftore of Effluvia : The great 
quantity of fpace that may be filledjas to fenfcjby a fmall quan* 
ti y of matter when rarifyed or difperfed* 
Secondly 5 with feveral Goofideratioas, evincing the great 
Efficacy of Effluviums;, notably operating upon one another, 
by at leaft fix wayes : i* By the Great Number of emitted cor- 
pulcle?. 2, By their /?e»elr^f/>^ and pervading nature. 3. By 
their Celerity^ and other modification of their Motion- 4. By 
the CongruiPf and Incongruity of their Bulk and Shape to the 
Pores of the Bodies they are to a^i: upon. Bytheil/e?- 
tions of one part upon another^ that they excite or occafioo io 
the Body th'tey work upon according to its flrufl:ure.6. By the 
Fitnefsaod Power they have to make themfelves to be ajjified 
in their woi king by the more Catholic^ Agents of the lloh 
verfe, • . 
Ppp ppp 2 
ihird'y. 
