• if:.v •>*.»[ '-iO '^lo rio^ Kd:*- f^ie'-7 ;^:"v' ••"> 
pTyS;' Bodies 'dtjfolved m Menfirua Sfeeipcdljf lighter ihmjhem". 
' i felvesy [mm thtrfimv. . ( 
By Mr. WILLIAM MOLTNEVX, oWublm: 
T He Liberty of Fhiiofaphifing being now univer(al]y 
granted between all men, I am fure that a difference 
in Opinion will be no breach of afFe£tion between t wo iatire- 
ly Loveing Brothers : And therefore I ihall take the fi*eedoni 
to Propofe iny Own thoughts in a matter wherein; my 
Brother Mv.Thomas Molyneux hath Appeard publickly in tb^ 
Novelles de h RepHitiqu)e des Letres j Mots dH Aout 1,684. 
Art d,, a,nd Mois dejaf^vler 168 5. 7. TheiProblem pro? 
pofed is, W/oy Bodies dtffdved flcAt in Liquors lighter thsn 
them f elves \ as for Example : Mercury diffol ved in ftrong 
Spirit of Nker &itns therein, th^^' e^ch fmall Particle (>f 
Mercury, be far heavy^Y than fb much of the Liquor whole 
place it occupies. This, fays he, cannot be folved by th^ 
prime Law of Hydroftaticks, which is, that a Body whig}^ 
in an equal Quantity is heavyer then alike quantity oiF Li- 
quor, finks m that Liquor; thus a Cubick Inch of Iron being 
heavier then a Cubick Inch Jqua-Fcrtis, and each Particle 
^'how fmall fbever) of Iron being heavier then a like Particle 
of Jqua-Fortis ; Iron being put into Jqua-Fortis fhould fink, 
and yet we find, that Iron being diffolved in a convenient 
Quantity of Jqua-Fortis floats therein, and does not fall to 
the Bottom. The Realbn which my Brother gives for this 
iSj that the Internal Motion of the Parts of the Liquor, does 
keep up the Particles of the diffolved Solid, for they bein^ 
fo 
