ERRATA 



Owing to an error in alignment the Table on p. 314 of Vol. IX. is given 

 incorrectly. It should read as follows : 



TABLE 11. 



Grades 12 3- 4 5 6 7 8 9 10 11 12 13 14 15 16 17 

 Calculated ) 



— 5 10 10 10 5 10 5 5 — — — — 5 15 15 17 7 



Actual ) 

 distribution ^ — 2 3 4 11 11 14 9 3 1 — — — 1 14 24 13 6 



Distribution \ 



Actual I 

 distribution [ 

 from Castle ) 



