Mifcellanea Curio fa, 309 



towards rhe Centers of the Sun, Jupiter, Saturn 

 and the Earth, and thence is reafonably in- 

 ferred, to be - the general Principle obferved 

 by Nature, in all the reft of the Cceleftial 

 Bodies, 



Thefe are the principal Affections of Gravity, 

 from which the Rules of the Fall of Bodies, and 

 the Motion of Projefts are Mathematically ded li- 

 able . Mr. Ifaac Newton has fhew'd how to de- 

 fine the Spaces of the Dfcent of a Body, let fall 

 from any given height, down to the Center, 

 fuppofing the Gravitation to increate, as in the 

 fifth Property ; but confidering the imallnels of 

 heighth , to which any Projeft can be made 

 afcend, and over how little an Arch of the Globe 

 it can be call: by any of our Engines, v/e may 

 well enough fuppofc the Gravity equal through- 

 out, and the Defcents of Projects in parallel Lines, 

 which in Truth are towards the Center, the dif- 

 ference being fb fmall as by no means to be di£ 

 covered in Prafticc. The Oppofition of the Air, 

 'tis true, is conliderable againft all light Bodies 

 moving through ir, as likewife againft fmall 

 ones (of which more hereafter) but in great and 

 ponderous Shot, this Impediment is found by 

 Experience but very fmall, and may fafely be neg- 

 lected. * 



Proportions concerning the Defcent of Heavy Bodies, 

 and the Motion of Projects. 



Prop. I. The Velocities of Failing Bodies, are 

 proportionate to the Times from the beginning 

 of their Falls. 



This 



