A. W. Wright— Gases contained in Meteorites. 173 
with their orbits in such a relation to that of Jupiter as to sug- 
ad the possibility of their derivation from the asteroids. 
imilar considerations also apply to the group of comets asso- 
ciated with the orbit of Neptune, the existence of which sug- 
gests the question whether there may not be another group of 
asteroids, exterior to this body, yet remaining to be discovered. 
But without assuming the asteroidal origin of these comets, 
the effects of solar heat just described may be safely predicated 
of them, as well as of other comets or meteoric masses revolv- 
ha matters which are present in some of them. 
correspond 
With the 
sibly acid 
oo ity of origin. 
Additional and most striking testimony to the real connection 
