Recent contributions to Astro-Meteorology. 289 
But during these eight or ten weeks the direction of the 
earth’s motion would change 60° or 70°. If the direction of 
the meteoroids’ motions were supposed parallel er pet the 
breadth of the stream, yet this change in the on ecti the 
earth’s motion alone appears to necessitate a chang abel posi- 
tion “2 Po radiant by a distance on the heavens of nh less than 
30° o 
But ot ra a group of such thickness, we can hardly suppose the 
absolute motions of the meteoroid parallel throughout its breadth. 
Each meteoroid must move about the sun in its own orbit, and 
though this is not entirely inconsistent with a parallelism of the 
paths where the group crosses the ieee bi such a pi? is ex- 
tremely improbable. Again it appears necessary that a meteoroid 
which is now on one side of the “ies should be after half a Te- 
volution on the opposite side. Hence, we might reasonably ex- 
pect that at the center of the aides we should find their paths 
crossing each other he large angles,—angles comparable in mag- 
nitude to the 60° or 70° which measures on the ecliptic the 
breadth of the vinta Such divergence of directions of the in- 
dividual members of the group, would ne the existence of an 
3 et radiant of _— area im 
area. 
e conclusions of Mr. Greg and Dr. Heis, are derived almost 
entirely from meteors seen in evening hours. But the phenom- 
enon of radiation caused by parallelism of absolute motions 
should be more promt evident as the radiant is nearer 1 
meridian. This occurs, in general, in the morning hours. 
While, then, she. existenes of rings or streams is a priort 
Some other cause than ‘ring-formations be found to account or 
the radiation. —. 
There should, in any case, be a tendency to a radiation, both 
from the zenith and from the point to which the earth is mov- 
ing; hence from the region ea between these eee Be, 
from the N.E. quarter of the hea 
yg eS 
