( 408 ) 
ERRATUM. 
Page 103 formula 2, 3 read as follow: 
i 1+ (pi Hpi) Eet m) 
S=B ji af Gn (p + p')(a ize ae (pri) (abs ae | | 
Page 104 Table I read as follow: 
: a B B 3 (1-x)+-%,2| 2 
| | | 
0 1.5328 | 1.5258 | 
0.2082 | 1.3057 | 4.3019 1.3075 0.2435 
0.30001)| 1.2052 | 1.202 1.2112 0.3084 
0.4492 | 1.0826 | 1.0809 1.0862 0.4243 
0.5077 | 0.9884 | 0.9877 | _ 0.9934 0.5131 
0.6498 | 0.8399 | 0.8398 0. 8444 0.6544 
\ 0.7085 | 0.7799 | .0.7802 0.7828 0.7140 
1 0.4765 0.4771 
