C 132 ] 
. ■ . . 
Received January 14, 1767. 
XVI Cogitat'd cle COME TIS . Communicated 
by Benjamin Franklin, LL.D. F. R.S. 
Illuftriilimce Societati Regia-, 
Ob iummum in fe collatum honorem, 
Cooptationem fcil. in eorum Sodalitium" 
* • * 
Hanc qualemcunque DifTertationem, 
Ea qua par eft obfervantia, 
D. D. C. 
Johannes Winthrop, 
Apud Cantab. Nov. Ang. Math. & Phil. Prof. 
Hollifianus, 
y° Maii 1766. 
LEMMA. 
R ea d Mrn-ch ig, /^|UM ex illuftrifiimi Newtoni in- 
7 ventis conftet, “ gravitatem in 
“ univerfa corpora fieri, earnque proportionalem efTe 
quantitati material in fingulis, et reciproce propor- 
4t tionalem quadrate diftantiaa inter corporum centra,’’ 
exinde fequitur, quod inter bina quaevis fyftematis 
mundani corpora exiftere poteft times attra&ionis, in 
4 quo 
