OUTLINES OF NATURAL PHILOSOPHY. 



from which the proposition fallows readily. 



1. By means of this theorem, the masses of the 

 and of the plnnets Tvhich have satellites, may be 

 compared with one another. 



c. In the Meccmiqttg Celeste^ they are calcalated front 

 the most exact data, as below t 



Quantity of matter in the Sun being = I 

 That in the Earth, = 



As the ratios of the Diameters of the planets are 

 known from observation, the ratios of their Bwlks 

 being the same with those of the cubes of their 

 diameters, are also known ; and hence the Densi- 

 ties, which are proportional to the quantities of 

 matter, divided by the bulks, are found. 



Density 



