ERRATA, ANTE USUM DILIGENTER CORRIGENDA. 



Introduction. 



p. xiii. Equation (i) cancel the + sign which follows A%o, or replace by - sign, 

 p. xiv. For Equation (vii) bi8 



read ff*% (-U - itj + a. i + uj + d^ (5 1 -3u - (_, -ttj)+Wo-o(0)=0, 

 and add : " This equation is most effectively dealt with by finding the value of 



Up- 



' 



and then calculating : 



p. xxxiv. Formula (xxxi), For N(ab cd")'* read N(ad-bcY. 



l>. xxxv. Table (3) was taken from Biometrika, Vol. IX. p. 292. Unfortunately it was not 

 there noted that Mr Yule's unit was 1000 houses : see his Theory of Statistics, p. 61. He 

 has drawn the Editor's attention to this regrettable omission. The table for the statistical 

 constants at the centre of the page should read : 



(3) Houses X 2 = 1439-2998, P-8'730/10 312 , while <p*, <j> and C t remain unchanged. 



On p. xxxvi. Lines 3 9 while correct for the illustration actually given as table (3) 

 on p. xxv, are of course incorrect for the' true unit of 1000 houses. The statement in 

 Lilies 19 23 with regard to the houses building or built is incorrect ; there is very marked 

 positive association. We must now include the house-data, and Lines 26 27 should 

 read : " If we regard these four tables the order of ascending association judged by either 

 <t> or <7 2 is (3), (4), (5), (2) as against Mr Yule's (2), (3), (4), (5)." 



p. xlvii. Line 6. For 4th -071,162 read 4th -073,116. 



p. xlviii. Table column (i), 22nd Line of figures. For 4'5 read 5-0, and for S(x) at foot 

 read S(jj}. 



p. xlix. Line 1. For 6j = 10c read 6 1 = 10ci. 

 p. Iv. Formula (xiii). 



For Io 8 ( r ^f.-. ) = '0399,0899 + etc., 



read log 



p. Ix. Table, A =-2, B = 7. For (21-556) read (31-566). 

 A = 2, B=S. For (12-202) read (13-202). 



p. Ixii. Line 11. 



67449 , -67449 

 for 20, and 20, , 



read -6744920, and -67449 20,. 



