98 B.V. Marsh on the Distinguishing Features of Comets. 
wire presenting the appearance of being corroded by the _ 
yesterday are scattered and lost, and we now see a new 
made up of a new set of particles constantly emitted from the 
comet, The position and form of the tail at‘any moment there 
fore depend solely upon the form and position of the electri¢ 
currents, and these again must be controlled, either directly oF 
indirectly, by the great disturbing cause of the whole phenome 
non, the sun, probably through the agency of a magnetic condr 
tion excited in the comet, the existence of which was first sug 
gested, I believe, by Bessel. 
Fo nethae arta ane 
+ volumes of this Journal, and elsewhere), 
ee emeeetmemne ne 
aceon 
- 
ARERR 
Se Or RE ap 
pene comenies 
