524 CONVERSION OF CRYSTALLINE SCHISTS INTO IGNEOUS ROCKS. 



behaviour of the igneous rocks of the region further west have since 

 been worked out in the Malvern Hills, as will appear in a separate 

 communication. 



6. Summary. 



1. There is no satisfactory evidence for the contention that the 

 igneous rocks of Western Connaught have resulted from the meta- 

 morphism of schists, since in every locality examined, including the 

 type section, the igneous rocks were seen to be sharply separable 

 from the schists and clearly intrusive in them. 



2. The " metamorphosed conglomerates " adduced in proof of the 

 original sedimentary character of the Galway schists are mixtures 

 of schist, diorite, and granite, or of two of them, the ground-mass 

 being usually granite. 



3. There is no proof that the foliation of the igneous rocks follows 

 an original structure. In the granite it is chiefly due to regional 

 pressure. Fragments of diorite in granite are not foliated, but 

 veins of diorite in schist sometimes display a foliation caused by 

 pressure. 



4. The ancient gneissic rocks of Galway town display evidence of 

 having been formed in part from mixtures of diorite and granite, 

 similar to the more modern diglomerates. 



(For the Discussion on this paper, see p. 514.) 



