180 Proceedings of the Royal Society of Edinburgh 
where the literal operators 3^2 . • 
dj Am 
+ (»-0)l + p( 
@3 are 
?^ = aA + 2jA-eA-2mA + Q ^ 
dD 
K ^ 4_ TT ^ _ TT A 
dR 
1 _ A 
.ao aN 
I ^ , OT ^ I ^ I 7 ^ 
- A ^ , OT-r ^ T? ^ OT ^ . T) ^ 1- ^ : T ^ ^ 
+ (N - V)^ + q( A _ |_y A + 2g,^ + /A + 1 
8_ 
a / ' ' a?7 
+ 2U A - X 
2RA + MA-QA + P 
+ A - + K( ; 
"■ • "wi + "s - “aTl - “s4+ “si - 4 + Sh - 4 
+ (0-N)^+S 
O 
M ao 
a \ , a , 07 a .a , a 
)o)'^ ^ + »«g^, 
H 
r. a 
^ ^aK ^SiA^ax ^AA^an %p 
+ (0-Y)^^ + R 
._a 
a ^ 
av ao 
, 7 a , o ^a , , a , a 
A = A - - 2T^ + 4 - 
+ (V-«)g^ + L 
aN 
^\i7.^io ^ \ 1 ^ \ -r 
a 
a?7 
- 7i + “ A - =7 + “pV < + 4 - 4 
. a 
aQ 
a 
\ , a , o a , ^a a 
e7- - 2K~ + t4 _ M-7+ h 4 - p_ 
Sg'^^*^0b "sk '“ef ' es “sl ' “ej sq 
-^a-o)A+u(|,-^^)+a+‘4+4+„ 
aB ^ip 
a/ 
2P ? +L-^ 
aA^ an 
4 
dm 
uA+tA - K ® 
an aG sq 
, /AT /A\ a , A/r/ a a\, a.^a a ^a. 
[Sess. 
