Astronomy. 429 
the —_ passed . the latter at the eruan of the ree ka 
show relation between the meteors and the comet, similar to 
that feoonely detected between the November meteors and the 
comet of 1866, was thus suggested as probatbe Is this hypothesis 
in harmony with facts? and if not, are our present data sufficient 
for determining with any reasonable probability, the true period 
Dates of the April Shower.—Professor Newton selects the fol- 
lowing from Quetelet’s Catalogue as belonging to this period :* 
C2 4, A.D,1093, 4 5, and ’6 
2. AG, 5. = 1122, 8 
aa 3. A. D. -_ 6. ‘<1 608, 
0 
ia very near . saat to 6 poibar of Be years the slightest nrg 
nation will show that this period doe t harmonize with any o 
ce oo etapa dates, This fact, en, "when further didvuaeiok, 
. 1 to the hypothesis that the period of the meteors is 
me cores otal to that of the comet. 
3 What is the probable period of the ring ?——The showers of 1093 
—6 and 1122-3 at once suggest a period of from 26 to 30 years, 
epoch may be placed any where between 1093 and 1096, and that 
of the latter, in either 1 122 a 1123. The entire interval from B. 
887 to A. D, 1803 is 2490 rs, or 88 periods of 28°295 y. each; 
and the known dates are all [satiated by the following scheme: 
/™ BC catwBo 15....672 ‘000 years = 24 periods of 28-000. each. 
r . to A. D. -597°0 =21 * 28-429 
_D. 2to 1093" ire 511-714 *§ =18 & 28-429 
* 1093- oh to “1122°143_.__. 984299 * = 1 & 28-4299 
“ 1122143 to “ 1803....680°357 “ =24 % 28-369 * 
These sedation indicate a period of about 283+ years, corres- 
_ Pending to an ellipse whose major axis is 18°59. Hence the dis- 
tance of the See is very nearly equal to the mean aiteaee of 
Uranus. It will also be observed that the time of revolution, which 
— to have been somewhat ee — the Christian era, 
ng undoubtedly to this period. eras made in 
land =e Sie a “a than beens number of meteors 
at the Decem mber epoch in that year. . 
 * This J July, 1863. 
+ Herrick assigned a value of 27 years See this Journal, April, 1841, p. 365. 
