affected by the Earth. 255 
theecliptic. For the Au gust meteors we thus perceive this aver- 
age effect to be 120 miles advance, while the maximum in the 
relative plane is about 530 miles, and the corresponding retro- 
gradation as above stated. 
tom these computations, as they now appear, the conclusion 
most pertinent to our object is that the nodes of the ring, so far 
as affected at all, are up to a certain limit retrogradient, and 
afterward advance, but only to an exceedingly minute angular 
amount in either case, 
t farther deserves mention that there is due to the same accel- 
eration on which the first of the above formule depends a mo- 
tion in the radius vector itself,—the expression for which might 
teadily be formed from the elements or quantities above employ- 
» Decause it is one to which, within the limits of the problem, 
that Tetrograde nodal motion bears the same ratio that the tan- 
on distance described by the earth in the time bears to the 
ference of the distances described parallel to the line of nodes 
‘in the same time. (F) 
cir nodes with the orbital conditions last impressed upon them 
by the earth. If then the meteoric orbits and the earth’s were 
' . 
ond cycle through the ring—then in a third, and soon. B 
the earth’s disturbance would of itself prevent entire uniformity 
, le : eta 
Ting, could fail to present themselves successively a little in ad- 
be an accu : cles, continued 
de mulation of effects through many cycles, 
Antil the individual penetrations instead of standing in the rela- 
be 
Should come ly into the condition of a successive ap- 
Proach by ths cas fee a opposite direction. Under the ne- 
