gent, equally increafing. As is known^ and commonly 
admitted, 
26. If we take-in the confideration of the Airs refiftence; 
we are then for each qf thefe equal progreffions, to fub- 
ftitute a decreafing progreffion Geometrical ; in like man- 
ner ( and for the feme reafbns/as in the line of projec- 
tion. 
27. Hence arifeth, for the firft mo- i 
ment m'^ for the fecond 4-^^; for the ^ ± 
A i i mm 
tmvd m^m^ -j-m^ Sec. And fuch is i 1; l 
therefore the Defcent of a heavy Body m 
■failing by its own weight. The feve- j^4^^3 
ral impulfts of Gravity being fuppofed 
equal. 
28. That isfia the figure of IT 12 ) as FL.FM, FN, 
&c, in the line of Deicent, anfwering toFL, L M^ MN^ 
&:c. in the line of Projefliion. 
29. But though the Progreffions for the line of Projec- 
tion, are like to each of thofe many in the line of Defcent : 
it is not to be thence inferred, that therefore m in the one^ 
is equal to in the other: But in the line of Projection 
ffuppofe )~^f(^ fuch a part of the force imprefled, and 
a celerity anfwerable: ) in the line of Defcent,-^^ ( fuch 
a part of the Impulfe of Gravity. ) 
JO. Thofb for the line of Defcent ( of the fame Body ) 
are all equal, each to other: Becaufe g ( the new Impulfe 
of Gravity ) in each moment is fuppoTed to be the fame. 
JT. But what is the proportion off to that of the 
force imprefled, to the Impulfe of Gravity in each Body ^ 
remains to be enquired by Experiment. 
32. This proportion being found as to one known 
fprce ; the fame is thence known as to any other force 
Mni f who's 
