1905-1906.] 383 



the "drusy" cavities associated with the Mourne Mountain 

 granite. These are cavities in the rock, perhaps contraction 

 rifts, where the essential minerals of the rocks have been able 

 to crystallise without mutual interference, and, as a result, fine 

 crystals of felspar, smoky quartz, and mica were obtained. Not 

 uncommonly crystals of beryl and topaz are also to be obtained, 

 and the efforts of the party were largely directed to this end, 

 but, with two exceptions, only small specimens of these were 

 found. The exceptions were two very nice crystals of topaz 

 found, one by a lady and the other by the Secretary of the 

 geological section. Microscopically this rock is a granophyre, 

 showing well-marked granophyric structure where the felspar 

 and quartz have crystallised out simultaneously and mutually 

 interfere. 



The start for Trassey Bridge was made about four o'clock, 

 and the brakes met there at 5-30. Passing through Bryans- 

 ford the members who had walked through the park were 

 joined, and the whole party were driven back to Newcastle, 

 where tea was provided at the Donard Hotel. 



Afterwards a short business meeting was held, and the 

 President (Mr. W. H. Phillips) called upon Mr. W. H. Patter- 

 son, M.R.I.A., to propose a vote of thanks to Lord Roden for so 

 kindly granting the use of his grounds to the Club, which was 

 seconded by Dr. Sheldon and carried unanimously. The senior 

 Secretary, then, on behalf of the Club, said how pleased they 

 were to see the Rev. J. F. Blake, one of the best known of the 

 British geologists, with them that day, and one who had dope 

 so much in the cause of that science. 



Reference has already been made to the finds of the 

 geologists. Various beetles and spiders were taken home to 

 be identified later; while very few birds were reported. The 

 botanists, however, had a field day, and many fine specimens 

 were found. The ferns were especially well represented. 

 Blechnum spicant was everywhere; while Lastrea pseudo-iras 

 (in various forms). Lastrea preopteris, Lastrea dilatata, and 

 Athyrls filis-femina were plentiful. A crested form, cf tne 



