W. A. Norton—Coggia's Comet. - 171 
orating effect of the sun’s rays will probably fall at some point 
of either the northern or the southern hemisphere of the nucleus, 
instead of on the equator; (2) the magnetic poles will not coin- 
cide with the poles of rotation, and the magnetic equator will 
be more or less inclined to the plane of the equator of rotation, 
as well as to that of the orbit. From this it follows that the 
lines of force will, in general, be more or less inclined to the 
astronomical meridian planes of the nucleus; and hence that 
the initial directions of the jets of cometic matter will be in- 
clined to these planes b 
a meridian should result from the cold produced by a copious 
evaporation and the intercepting action of the vapors already 
be supposed : 
tor, and extend gradually both north and south. The Neti, 
directions of the discharges, and therefore also of the initi 
side, the gedaera becomes parallel to the equator (ecg), and 
thus to the radius vector (ce). From 0° to 35 
