172 _ W. A. Norton—Coggia’s Comet. 
this line, and beyond 385° diverges from it under a larger and 
larger angle. If the initial velocity is constant, as well as the 
solar repulsion, the escaping molecule should attain to its great- 
_est distance from the nucleus when the discharge occurs from 
the latitude of 35°, and in the precise direction of the sun, If 
then the process of electric dischar egin near the equator, 
and extend gradually to the north and south, the outer surface 
of the envelope formed will gradually move away from the 
nucleus, and attain its greatest distance when the process reaches 
the latitude 35°. The jets that issue from latitudes greater 
than that (about 35°) at which the direction is parallel to the 
radius vector, do not pass sensibly beyond the boundary line of 
the jets that proceed from points between 0° and 35° of the 
other aay wed, unless for such jets the projectile velocity is 
greater, or the solar repulsion less. 
BR 
2 
What has now been stated should be the precise result if the 
molecules after receiving a projectile velocity were exposed 
only to the retarding force of the solar repulsion. The effect- 
ive action of the nucleus would obviously modify somewhat 
the curve for each initial direction, and alter the limiting lati- 
tude for which the recess in the assumed direction is a maxi- 
mum. If this effective action is attractive, this latitude will 
exceed 35°, if it is repulsive, it will be less than 35°. 
* 
