330 
POPULAR SCIENCE REVIEW. 
observation or by a double or diffused radiant point, which 
must often occasion non-conformity in the observed flights. 
In 1878 two points of departure were manifest from a series of 
precisely fixed courses at 44° + 59° and 42 + 54°; but in 
1879 the weather interrupted observations. The present year, 
however, afforded an "exceptionally favourable opportunity to 
observers, and the major radiant determined by the writer was 
at 44° + f)6°, with the decided traces of a sub-radiant at 
45° + 60°. In 1878 Major Tupman found the shower double 
at 46° + 57° '6 and 38° + 56° ; and in 1880 he strongly corro- 
borated the results obtained at Bristol, though his observations 
were mainly confined to the night of August 9. At the latter 
station the radiant apparently advanced amongst the stars of 
Perseus , for while early in the month it was observed at 
38° + 56° it had shifted to 49 + 57|° by the 13th. The 
same peculiarity was noted in 1877, when the following deter- 
minations were made : — 
Aug. 3-7 
Aug. 10 
Radiant. 
40°+ 56° 
43 + 58 
Aug. 12 
Auo’. 16 
Radiant. 
50 + 55 
60 + 59 
There is a prominent display of meteors from the star- 
group y Persei at the end of July and beginning of August, and 
it is possible that these showers may belong to the same system 
of concentric meteor streams. It is certain that this fact of a 
progressive radiant requires fuller elucidation, and to this end 
observers should keep the data obtained each night separate. 
It may also be suggested that the radiant point should be 
ascertained during each hour of observation, and then when 
the series are compared, any displacement must immediately 
become obvious, and its extent and character well defined by 
the observations. The meteors from Perseus are so numerous, 
and the place of divergence so readily denoted by their en- 
during streaks, that there will be no difficulty in an investiga- 
tion of this kind. The last two years’ observations have shown 
how exactly the radiant may be found by carefully- conducted 
researches, and how closely the positions derived by different 
observers will agree on being compared together : — 
Observer. 
1379, August. 
Chief Radiant. 
G. L. Tupman 
H. Corder . 
E. F. Sawyer 
W. F. Denning 
45 
45 
4 M 
46 
+ 56 
+ 57 
+ 57 
+ 58 
From these values a mean of 44° *8 + 5 6° *8 is derived, which 
1880, August. 
Chief Radiant. 
44 + 56 
45 +58 
44f + 561 
44 + 56 
