AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[THIRD SERIES.] 
*. 
Art. XV.—On the Origin of Comets; by H. A. Newton. 
facts since the times of Kant and Laplace learned any thing 
which helps us to decide between these two hypotheses? T 
medium (if such exists), and the attraction of gravitation of 
the sun and planets. 
8. Nearly all the comets that we have seen, and have com- 
ay the orbits of, come nearer to the sun than the planet 
ars. The exceptions are only about five per cent of the 
Am. Jour. sige ioe: ERIES, VoL. XVI, No. 93.—Sept., 1878. 
