[878.1879.] 



WINTER SESSION. 



Note. — The Authors of the various papers, of which abstracts are here appended, 

 are alone responsible for the views and statements expressed in them. 



HE first meeting of the Session was held on Tuesday 

 evening, 26th November, when the Vice-President (Mr. 

 William Gray, M.R.I.A.) delivered an opening address, 

 reviewing some geological and archaeological questions connected 

 with the North of Ireland. Mr. Gray explained that he was 

 obliged at short notice to open the Session, owing to the illness of 

 the President, and that as the President's annual address usually 

 referred to the previous meeting of the British Association he would 

 follow the President's example to some extent, and review those 

 questions in geology and archaeology, brought before the late 

 meeting of the British Association, which had reference to the 

 North of Ireland. There was a group of papers introduced which 

 gave rise to a considerable amount of discussion on the vexed 

 question of metamorphism. Mr. Gray explained that there were 

 three kinds of rock familiar to the geologist — the sedimentary rock 

 known to have been deposited in water, of which our Chalk and 

 Lias are examples; the plutonic rocks, which at one time were 

 poured forth as lava, of which our granite and trap rocks are types ; 



