WHITE HATTSE AND GREAT COCKUP. 513 



mineral constituents of the two rocks is unimportant, being no 

 more than has been- shown to exist in different portions of the 

 Little Knott exposure. 



My best thanks are due to Prof. Bonney for his kind help with 

 the rock-sections, without which my paper would have been of no 

 value. 



Discussion. 



The President remarked that the rock described by the Author 

 appeared to verge on a diorite, and commented on the comparative 

 rarity in the Lake District of rocks containing minerals rich in 

 magnesia, 



Mr. Etjtlet remarked that although the rock from Little Knott 

 was a picrite, as already stated by Prof. Bonney, it was remarkably 

 rich in hornblende, and resembled a diorite in external appearance. 

 He had not examined sections from the other exposures mentioned 

 by the Author. 



Mr. Mare also spoke. 



