170 
Proceedings of the Royal Society of Edinburgh. [Bess. 
deb d(b dej) 
q-T + 2 f-^ + + 71-^ 
'^dh^ ^/2 
- 2 . 4-4 +(<^ 3 - 2 - 4 + (^ 3 -%)| 
-JA-JA+aPA-^A\=o. 
^ dX ^d<r '^^\dtii dv 
(jQ/^ uOiy O ^2 
+ 
(vi) From the coefficients of ? '^ 23 » ^23 ’ ^ 
23 ’ 
J def) d(j> 
\dni^'^ dn.2 
+ ' 2 (h + f /2 ”/i)^ “ ®i|; + “2^ + (^‘4 + ^2 - 
def) 
+ « 3 ^ + (^^4 + ^3 “ ^ 0 )^ - 2 ^ 4 ^ + (^4 + h)( - 
^dfX 
dr ^di 
dcf> 
day dlfr. 
+ (/*3 +/l - !? 2 )^^ + (/4 + «*3 - "- 2 )^ - + ”*l)( 
def) _ def) 
doj dij/ 
) = 0 , 
! 7 l^ + 
dg.^ 
+/( 2M + ^ 
5^3 dfj \df\ dc 
+ d -rf +^U-^ + 
r^ 4 .M 
d?i. 
+ + (“3 ~ ■'■ (^'2 ■*‘•^1 “ + (/4 + ®2 “ 
<lr + S-) +”*(#+ S) + iw + #) + ? 
+ 2 (m 3 + Mg -/ 4 )|| + («4 - 2 ;i)|^ + (/^ + J», - + d^ 
+ (^3 + »4 - . 2 )|t + + "dit - 2 ) = • 
