526 Mr. milner on the Precejfion , &c. 
fliould probably have remained fo, if M. d’alembert {i \ 
in his Opufc. vol, V. had not perfifted to affirm, that the 
mean motion of the nodes of the ring of matter and of 
the fatellite were the fame. 
This opinion of fo celebrated a mathematician raifes 
fcruples in one’s mind; and thews, that when we ven- 
ture to differ from Sir Isaac newton in thefe matters, it 
is with the utmofl difficulty that we can arrive at cer- 
tainty. 
(d) II n’y a de pari'te que dans lc mouvement moyw de ces deux anneaux, on 
del’anneau folide et de la lune; les mouvemens injlantanh font tres differens de 
part et d’autre; ainfi la comparaifon du mouvement de Panneau avec celui de la 
lune, ferviroit tout au plus a trouver le mouvement tnoytn de Panneau, ou de la 
preceffion des equinoxes, mais nullement a determiner la nutation de Paxe et 
Pequation de la preceffion* 
