GABBEOS ETC. IN SCOTLAOT) AND IRELAND. 97 



he thought, had not quite understood the question of petrographical 

 provinces. Both acid and basic rocks occur in each, as he showed 

 from instances in Hungary and Bohemia. Glomero-porphyritic 

 structure might or might not be due to the breaking up of an 

 earlier-formed troctolite. Palagonite was certainly not a mineral, 

 but a hydrated glass. The final results of Mr. J. S. Gardner's work 

 would be very welcome ; the important point at present is that all 

 the rocks are later than Cretaceous. He agreed with Mr. Teall 

 that there is a distribution of rocks both in space and time. 



a J.G.S. No. 165. 



