Editorial 
527 
We have : 
n 
Hence fi,' = M:iMo = ^in + l) fi,' = '^''[~P^ (xix), 
71+2 
Hence fj,,' = M,'/M: = a'f^/ (xx). 
Transferring to mean : 
= 1 =— (xxi). 
Thus /tig will grow small, not only owing to the factor ^ , but because cr^- tends 
to equal <T^/2n as n increases. 
1- 
Now /^i = ^3 = -1 
^-*''(!y(i-^,)7(^»i 
Here 1,1 a is of the form 1 — — , and 
' n 
and thus ySi tends as n increases to take the form '^y^^ln, but as may be a 
considerable numerical coefficient commensurable with n till ?i is very 
considerable. 
We next turn to /i4, and shall endeavour to express it in terms of yti2 = f5^- 
Since /^a' = /"■a + = o"^ ^1 — 
by (xi), we have 
