C 3 + ] 
will be o.co888, the logarithm of — ? — 1.02066- 
and the maftes of the Earth and Moon would, on 
this fuppofition, be as 48.4027 to 1. 
In all this, a fmall variation from the law of at- 
traction, arifing from the fpheroid-figure of the earth, 
is neglected as inconfiderable ; which it will be found 
to be by whoever takes the trouble to compute its 
quantity and effects. 
REMARKS. 
1. If F and D were taken of their juft quan- 
tities, the Moon’s horizontal parallax for an immove- 
able Earth being, at the equator, 57' 124", is a limit 
which the true mean parallax cannot exceed : and 
the correfpondent diftance 60.08906 is a limit which 
the diftance cannot fall fhort of : both being com- 
puted upon the fuppofition that x 4- 1 — x, or that 
the matter of the Moon is as nothing in comparifon 
of the Earth. Nor ran the parallax and diftance be 
fuppofed to lye very near thefe limits, without leav- 
ing too little attractive force in the Moon to raife the 
tides. 
2. If the Moon’s mean apparent femidiameter is 
15' 381", and the diftance of the centers 60.5883 
femidiameters of the equator, according to Sir llaac’s 
eftimate of the maftes ; the femidiameter of the 
Moon will be 0.275601 parts of the femidiameter 
of the equator, or .2763 of a mean femidiameter of 
the Earth. And the magnitudes of the Moon and 
Earth being as the cubes of their femidiameters, if 
the inverfe ratio of their magnitudes is joined to the 
5 direCt 
