ERRATA. 



lv. 339, line 10. 



i-y/7 



\-JÏÏ 



m 



for 1= 



read 1 = 



/,=- 



k+^/k 



\ + y/k' ' l l + ^/k 



Pg. 339, line 14. 



for K= -|(l+2fc+2Ä±+2/& 9 + ) 



recul K= -J (1 + 2A+2Ä*+2Ä 9 + )? 



93 93 



<n in 



+ + 



¥ ^ 



3C 



Jj- 





^v 



*T 



JE 



