ERRATA. 



Page 8. Table, 2nd column, line 17, read 189*. May 1. 



Page 9. Table, last column, for 7 a, 7b, and 7c read 10a, 10b, and 10 c, 



for 10 b read 13 b. 

 Page 14, line 8 for No. 12 read No. 15. 



