128 Scientific Intelligence. 
intersection of the two orbits. An approximate solution applicable to 
this case showed, however, an annual increase of the longitude of the 
node of about 10” due to this cause. e whole computed procession 
Computing then the effect of the perturbing action of the planets upon 
the group, supposing it to have a periodic time of 33:25 years, 
In the last column R—r is the earth’s radius vector at the node, minus 
of the comet. We give the whole table notwithstanding the fact 
that some of the showers are uncertain. The two dates in April belong 
the shower. , 
Date ef shower. Nodal passage. Comet. Node. R-r. 
Jan. 1-4, Jan. 3 Ii. 1792 U —0:073 
Sat eS . 4 IV.1860 Q +0:025 : 
Apr. 4-11, Apr. 13 8387 () —0-021 Very uncertain orbit. 
i “20 I, 1861 U 
July 27-29, July 27 IL. 1787 0-005 
ef 18- Gat ee —0-054 Uncertain orbit. 
hs 1763 —0016 
Oct, 19-26, Oct. 19 177 mY 024 
8 < a put eee g —0-078 
* : 21 10 UM +0056 
“ 2% 1366 «=% 2 ©=606—0054 
Nov. 28, Nov. 28 Biela’s U —0-018 
Dec. 6-9, Dec. 9 IV.1819 QO ! 
The Comet I 1852, as well as III 1862, crosses the path of the 
earth on the 10th of August. Dr. Weiss suggests this as a cause of the 
= 
