148 THE BALi. & OTHER EOCKS OF LAMBAT. [Feb. 1 898. 



PLATE IX. 



Geological Map of Lambay Island, on the scale of 4 miles to the inch. 



Discussion. 



Mr. W. W. Watts congratulated the Authors on the excellent 

 work that they had done. He was not quite convinced by the- 

 arguments which he had heard as to the outpouring of parts of the 

 Lambay porphyry in the form of lava. 



Mr. G. W. Lamplugh asked whether the Authors had found any 

 pebbles of the porph3Tite in the Old Eed Sandstone, as he believed 

 that Mr. McHenry thought the point of importance. 



Mr. Gardiis^ek, in reply to the last-named speaker, stated that no 

 pebbles of the coarse porphyrite had been noticed by the Authors 

 in the Old E-ed Conglomerate which occurred on the island. 



