ERRATA. 



In Professor Tait's Paper, 

 Page 281, line 6, omit the sign of integration. 



In Dr Dickson's Paper, 



Page 641, note, line 1, omit " only." 



Page 646, line 3, for " extremities" read " extremity. 



Plate XXIX. fig. 14, for " pt" read " pi." 



