Errata it) No. 35 (August 1878). 



X \) 



from bottom, for -7 dx-\ — t. 

 90, - 13, for .r« 2 = cy* 2 read x**=CyP 



x y x y 



Page 80, line 3 from bottom, for -5- dx-] — r^ read -7 dx+ t- 2 



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