s8 £>f tine gPecfyanical 0D;tgtne 



as in this to enlarge the former pores, 

 or produce new ones, by intercep- 

 ting little cavities (for they muft not 

 be great ones) between the particles 

 of a body to be raifed, and thofe of 

 the additament. For., by thefe and 

 other fuch ways of afibciation, the 

 corpufcles, refulting from the com- 

 bination or coalition of two or more 

 of thefe differing particles , may 5 

 without becoming too big and un- 

 wieldy^ become more conveniently 

 fhapedj or more light in proportion 

 to their bulk y and fo more eafily 

 buoyed up and fuftained in the air f 

 (as when the Lid of a Copper-box 

 being put on, makes the whole box 

 emerge and fwim in water,becaufe of 

 the intercepted cavity, though nei- 

 ther of the parts of the box would 

 doe fo.)) or otherwife more fitted fo? 

 avolation than the particles them- 

 felves were before their being joined 

 to thofe of the additament. 



By two things chietly the corpu- 

 fcles of the additament may contri- 

 bute to the elevation of a body. For 



firfi, 



