Errata in No. 70 (June 1881). 

 Page 415, line 10 ; insert 1^ in blank space. 



Page 432, line 9, for C x : C read C : C 



— — 18, for C, : C read 0, 



— — 21, for C, : read 0, 



— — 26, for C x : C read C, 



— — 28, for G x : read C x 



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