370 Proceedings of the Royal Irish Academy. 



Cainozoic example in the Isle of Rum, we may be sure that the- 

 theoiy of the formation of banded gneisses by admixture ^will receive 

 adequate recognition throughout the British Isles. 



As will have been seen, I am much indebted to the officers of the 

 Geological Survey for permission to examine the specimens and rock- 

 slices in their collection. Mr, A. M'Henry has been especially generous 

 in discussing material gathered by himself from the Ox Mountains, 

 "which will form the basis of a report to be presented by him shortly 

 to the Academy ; and I am glad to think that our views are Kkely 

 to be in complete harmony as to the intrusive nature of the gneiss. 



