412 
THE TERTIARY VOLCANOES 
BOOK VIII 
Though the acid intrusions are somewhat irregular both in thickness 
and direction, they lie generally parallel to each other in the line of strike of 
the bedding of the gabbros. They are no doubt apophyses from the main 
pale fine-grained granophyre like that of the South Bay, I did not detect, 
either here or anywhere else in St. Kilda, a definite spherulitic structure such 
as is so common in the granophyre dykes of Skye. 
