fame Author r AB ( the femi- diameter of ' the Earth* ) is of 
2587000c foot, and BC (the height of the Tower of the Aft- 
nelli in Rononia) of 240 foot 5 and therefore AC is 25870240, 
which hath the fame proportion to FS, 15 foot., to wit, ye fall 
in one fecond ? which AC in parts 20000C000C0 hath to FS 
ii 596 £ 4 **J 5 but fupffofing 5 wkh Riccieli, CSrA a femi-circle, 
FS is 53 parts^ of which AC is \ ooocobc ocb: Hence conclu- 
deth Angeli, that CSIAis no wayes ne^r to a femi-circle^ which 
is moft lure, iffo be the weight fall not to the Center of the Earth 
precifely in 6 lioursr %t in this cafe of Ricchli, the weight falls 
to the Center of the Earth in 21 mkuth and 53 feconds. 
Manfredi in his Anfoer for Riccioli affirms , that Angtli 
underftands not the Rule of Three, in giving out FS. for 
11 596 ^jjy'-rf which AC is 2000000C000: And Angtli 
in his Reply affirms his Analogy to be fo clear, that there can be 
nothing laid more evident than it felf to confirm it i referring in 
the meantime the further determination to Geometers. 
Angeli might have anfwer'd Rtcciotis Argument, granting 
the weight to move equally in a femi-circle, by diftinguilhing 
his Minor thus ? 
Nulla Corpora gravia defcenderent ad Terr am cum velocitatis 
incremento reali ac notabili, fi Velocit-as computetur in circum- 
ferential femi- circuli 9 Minor propofttio e(l vera. At non computatur 
it a Mot us defcenfivus : nam hie met us aqualis in circumferentia 
femi- circuli CIA. compmitur ex motuaquali in quadrante CD, 
& nStu accelerato in femidiametro mobtli C A ^ & hie moius ac- 
celerates in femidiametro eft veru$'& fimplex motus defcenfivus^ 
in qua accept ione Minor propofitio eft falfifima, & Riccioli etiam 
experientiis contraria. But it feems, that Angeli anfwereth other- 
wife, to make Riccioli fenfible, that CIA is no femicircle 5 con- . 
cerningthenatureof which Line they debate very much through- 
out the whole difcourfe.; 
The fecond Argument is much infifted upon by Angelica make 
his Solution clear to vulgar capacities 3 but the fubftance of all is 5 
That the Canon-bM hath not only that violent motion,impre(Ted 
oy the Fire, but alfoall thefe motions proper to the Earth, which 
•Tcrc communicated to it by the unpulfe received from the Earth s 
for 3 
