To face ^age 174. 



Oral communications made by Sir Roderick MurcMson and Pro- 

 fessor Sedgwick at the third meeting of the British Association 

 (Cambridge, 1833) have, through inadvertence, not been referred to. 

 These communications are, however, merely reported in a few lines 

 of type, and simply state that the authors explained the leading fea- 

 tures of their respective regions ; Professor Sedgwick pointing out 

 the relations of his tract to that described by Sir R. Murchison, of 

 which the latter exhibited coloured maps and sections. (See Reports, 

 Brit. Assoc. Adv. Sc. vol. iii. Proceedings, p. xxxiii.) 



Quart. Journ. Geol. Soc. vol. viii. Part I. 



