58 H. A. Newton on November Star-Showers. 
solute motion of each vacetie then, is Seeger very nearly at 
right angles to a line from it to the n, the deviation being 
probably not more than bw or three degrets 
ow if in one year the Broup makes 2 + ;;!,; Tevolutions, 
time is 33° 25 yea Bi a small ict of the orbit near the 
perihelion fulfils it. On the other hand, if the annual motion is 
= revolutions, the required condition is answered through 
a large part of the orbit. Inasmuch as no reason appears why 
the earth should nee a group near its apsides rather than else- 
where, we must regard it bs ab probable that the group makes 
in one year either 1 + gy'zz, OF 1— g3'z5 revolutions. 
13. If either of these two mean motions are correct, the absolute 
velocity of the meteors will be very nearly equal to that of the 
earth. Hence, the inclination of the ring to the ecliptic will be 
about twice the latitude of a radiant, or 17°, the motion being, 
as before shown (9), retrograde. 
14, Let ‘AB be the earth’s path near the node 2. 
N of the orbit of the group, and let CD be the i 
i e directions of the 
at be from A to B, and from CtoD. It a 
is reasonable to suppose that the shape of a 
section of the group made by a plane tangent 
to the two orbits, will be an oval. Also, a curve in that section 
representing parts of the group of equal density, will be an oval. 
If now the group has not arrived at N when the earth is there, 
the maximum display of meteors is to be expected later in the 
year, that is, when the earth is at m. On the contrary, if the 
group has passed the node before the earth Petts it, the maxi- 
mum display is to be expected earlier i in the 
Now if the group makes 1 + 3;'35 Fevotniioiis 3 in a year, its 
positions on successive years will pass from C toward D. Henee, 
in that case, in the earlier part of the two or three years during 
‘hich a shower is to be expected, the display would be later in 
the year than usual, and conversely. 
On the other hand, if the group describes 1 — ;,',; revolu- 
tions in a year, its position on successive years will pass from 
D to ©, and hence in the earlier part of the two or three years 
the display is to be expected earlier than usual, and conversely. © 
By the former of these two suppositions, we ought evidently | 
eC 
the second supposition the Hd on should be alike. It ought 
rather to eden there is a tendency to produce these effects, 
<e contains “unis He errors resulting from 
dates. An examination of the two columns 
