ERRATA. 
Dr F. de Helguero has sent the following corrections to his Note, Biometvika, Vol. iv. p. 230. 
It is desirable that they should be made at once, or they may give much trouble to a computator 
using the formulae on that page. 
Equation (29) for the third term —ZQ^^^p.J' read +^Qfji-i'p-f', 
„ (B) for the fourth term + 8 (4i^5 + Sv/) ^^'5 ^.^^d ->rl8 {Av-^-\-bv^) pi^, 
„ „ for the fifth term +Q(j-iy^^-Zv;^) p.{* read +6 (74i/4- .Si'j'')/)./^ 
„ „ for the mveiith term —''•iiyn'r^ + lv^p.p read (fi'v:, + lv^^) i>p. 
