194 H. A, Newton on numbers of Shooting Stars. 
peruiieritios of been ee and of direction, are evidently to a 
great extent eliminated. 
When two aun count the number of shooting stars which 
they can see, they naturally look in opposite directions. Wes 
therefore take account only of such couples, of which there are 
ve. Designating by the symbol aT the number of shooting 
stars which were seen by one or.both of the two observers Hulst 
and Tallman, and so of like symbols, we have the equations, 
HT =17, DE=68, MW=66, sAF=79, GR =87. 
The several observers, except the two looking to the zene 
enter edecatas Sia into these equations. One of these tw 
saw 36, and the r 40 meteors, while the average ee 
seen by each of ae pia sae is 88°75. Hence, only a small error 
will result from their omission from the equations. In the mean 
of the numbers above given we should have, therefore, the num- 
ber seen by two observers looking to opposite quarters of the 
heavens, freed very nearly from personal ROoULarines This 
mean is 75-4. Hence 
No. seen by two EE EEE No. seen by twelve persons :: 75°4 : 186. 
The following equations contain the same ten observers ar- 
ranged in groups of threes, each observer included in three 
equations, and each group of three persons arranged very nearly 
er enieneelly « around the horizon. The zenith observers as be- 
ore are omitte 
EMR=113, GHW= 097, DéW=79, DFG=96, AHW=105, 
= 109, AER=108, DFT=91, FMT=93, MRT=106. 
The mean of these is 99:7. Hence, 
No. seen by three persons : No. seen by twelve persons :: 99°7 : 186. 
Again, selecting groups of four observers that shall be arranged 
as seek y as possible symmetrically around the horizon, we have, 
DEGR = 123, GMRW = 124, 3 
AFHT = 124, ADEF = 112, Mean = 1192. 
Hence, 
fe seen by four persons : No. seen by twelve :: 119-2 : 186. 
g groups of five or more observers we may include 
ies eekine to the zenith : 
ABDEF = 123, AFHPT=134, BHMTW=131, GMPRW = 133, 
DEGPR= 134, ADRTW= 133, EFGHM = 135, Mean = 131°86, 
the number seen by five persons. 
gain, 
ADPRTW = 141, and BEFGHM = 145. The mean = 148, 
the number seen by six persons, 
+. 
