LECTUBE IX. 



THE PARALLACTIC INEQUALITY, (continued). 



LET us now consider the terms in 5/ which have been left outstanding. 



Include additional terms X 5 cos 5i//, \b,, sin 5t// in 81, 8$, and equate 

 to zero the coefficients of cos 5$, sin 5\]t in the differential equations that 

 give 8/, 80. 



We have 



In these equations substitute 



g- 



Then 



15 



- 256. + 1 ( 1 + n') a. = - 60,6, - 6&., 3 - 1 n' 2 6 3 - n' 2 f ~ 6. - ^| a 



A \Jo lo 



Eliminate ^, : 



