222 



SIR ARCHIBALD GEIKIE ON THE BASIC AND [May 1 894, 



which display the most exquisite spherulitic structure, up to the last 

 visible exposure. 



The third dyke (III.) lies about 12 yards east of the second. 

 I traced it for about 40 feet, and then lost it in the rough gabbro 

 ground. But, even where not visible at the surface, some of these 

 dykes may be persistent underneath, and may not improbably come 

 to the light again farther south as the detached bands (' inclusions ') 

 of felsitic and spherulitic material to which I shall afterwards 

 allude. 



Fig. 1. — Plan qf a portion of the ridge north of.Druim an Eidhne, 

 south of Glen Sligachan, SJcye. 



a. Gabbros; b, granophyre ; I., 

 II., III., three dykes proceeding 

 from the granopbyre. The arrows 



show the direction of dip of the 

 bands of gabbro. 



That these three dykes are apophyses of the large bodv of grano- 

 phyre of Glen Sligachan admits of no question whatever. As a 



