INTRODUCTION.

bodies here gravitate towards the earth, in proportion to thequantity of solid matter in each; and that the moon gravitatesto the earth likewise, in proportion to the quantity of matterin it; and that the sea gravitates towards the moon, and allthe planets towards each other; and that the very comets havethe fame gravitating faculty; we shall have as great reason toconclude by this rule, that all bodies gravitate towards eachother. For indeed this rule will more strongly hold in thiscafe, than in that of the impenetrability of bodies; becausethere will more instances be had of bodies gravitating, thanof their being impenetrable.

2,y. T h i s is that method of induction, whereon all phi-losophy is founded ; which our author farther inforces bythis additional precept, that whatever is collected from thisinduction, ought to be received, notwithstanding any conje-ctural hypothesis to the contrary, till such times as it shall becontradicted or limited by farther observations on nature.