V 
C 440 3 
Accounts of BOOKS 
Tro[>oJttiones Hydrofiaticd ad Illuftrand. Ariftarchi Samii 
Syfterfia deJiinaUy<^ qu^dam ^hmomem Naturae Gene- 
ralia. ^^fc. Francifcojeflbpj^m. Lond. 4^°- 1687. 
THIS Book contains an Hypothefis, and Demonftrati- 
on thereupon, concerning the Nature of Bodies and 
their motions. The Author defines a denfe Body to be that 
which hath leaft Vacuity. A Bubble a rarer Fluid in a more 
Solid ; a Drop a denfer Fluid in a more Rare. His Pofiti- 
on is, That a denfe Body is more potent than a rare. His 
Suppofition is, That in a Body raixt of thefe two, both en- 
deavour to recede from the Center of it : And thence his 
firft Propofition is, That the moft denfe Parts will get out 
moft, the lefs denfe will remain in inner Stations, which he 
calls natural, x. He fuppofes, any other Body immers'd in 
this will find and take its natural Station, according to its 
comparative Denfity : the endeavour to go to this natural 
Station, if downwards, is Gravity 3 if upwards, is Levity. 
Thefe Bodies are comprefs'd by External Bodies. Thence, 
4. he concludes, Spherical figured Bodies to have leaft of 
any figured Bodies of this Compreffion. 5. Hence, That 
denfer and rarer Bodies will not mix, but 6. the inclofed 
will be preft by the other into a Spherical Body, a Drop, or 
§ Bubble. 7. If the Figure be alter'd, it will have an endea- 
vour to reftore it felf. 8. Lefler Globules will have more 
of that endeavour 5 whence a greater broken into leflTer 
Globules produces more of this endeavour outward. 9. That 
a Globule, in its natural place, is eafily diffipated, 10. The 
nearer a Globule is to its proper place, the lefs is its Gravity 
or Levity. But, 11. In a turbid Body the denfer parts will 
fettle about the Center, the rarer outwards: thofehe calls 
a TerreUa^ thefe an Atmojphere : this Compound will find 
its 
