Letter

1 XV|  from west to east since the comets traverse those spaces, sometimes
2 XV|     the planets, he subjects comets to the same law. The orbit
3 XV| Isaac Newton.~He proves that comets are solid bodies which move
4 XV|      parabolas, that certain comets must take up above five
5 XV|     more than any other that comets are hard, opaque bodies;
6 XV|   The guessing the course of comets began then to be very much
7 XV|    Whiston, and fancied that comets were always the forerunners
8 XV|    sun has detached from the comets, an opinion which, at least,
9 XV|   alone keep the planets and comets in their orbits, and cause