Errata in No. 74 (September 1881). 



Page 189, art. 4, line 2, for x^ read x° 

 „ „ „ 4, for tz' read As 



Page 192, art. 17, line 4, dele the initial " 3 " 



„ 195, art. 29, line 4, for (1+^ 3 ) read (l+# 3 ) 2 

 Pages 189, 192, 196, arts 1, 15, 36, for vol. xiii. read vol. xii. [The 

 XIII. at foot of No. 170 of the Proc. L. M. S. is wrong.] 



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