Notices of Memoirs — British Association, Section C, 463 



The rock is quite fissile in one direction, but in others breaks with 

 difficulty, and with a rough splintery fracture. A microscopic ex- 

 amination suggests, however, no further alteration in the description 

 already published, and it is therefore evident that the " Wolf Eock " 

 may be regarded as a typical Phonolite composed of nepheline, 

 nosean, sanidine, hornblende, and a little magnetite. 



The base, or mass of the rock, consists of small crystals of nephe- 

 line and felspar, the former being most abundant, numerous small 

 yellowish-green prisms of hornblende are scattered through it, 

 and then there are comparatively large cr^j-stals of sanidine, nosean, 

 and a few of nepheline porphyritically imbedded in the mass. As 

 this is the only English Phonolite hitherto observed, it affords a 

 good illustration of the value of microscopic investigations, the result 

 in this instance being the discovery of a rock and two minerals not 

 previously known to occur in these Islands. 



It may be observed in conclusion, that the rock does not exhibit 

 the least trace of alteration in any of its constituents ; and as it is 

 mineralogically identical with the Tertiary phonolites, it is quite 

 possible that it may belong to that period, although we have as yet 

 no evidence of the extension of the great Tertiary volcanic eruptions 

 to the southern end of our island. 



nsroTiOES oip nvcEiivdioiias. 



I. — British Association for the Advancement of Science. 

 Forty-fourth Meeting, Belfast, August, 20th — 25th, 

 1874. List of Papers read before Section C. (Geology). 



President— Vxoie%50x'E.j)VJAKD Hull, M.A., F.R.S., F.G.S. 



The President's Address. 



Prof. Haj-kness, F.R.S. — Sketch of the Geology of the N.E. of Ireland. 



The Report of the Sub-Wealden Exploration Committee. 



E. T. Hard7nan, F. C.S. — On the Geological Structure of the Tyrone Coal Fields. 



Prof. A . Nicholson, M.D., D.Se. — On a Remarkable Fragment of Silicified Wood 

 from the Rocky Mountains. 



Prof. A. Nicholson, M.D., D.Sc. — Description of New Species of Cystiphyllum, 

 from the Devonian Rocks of North America. 



Prof. A. Nicholson, M.D., D.Sc. — Description of Species <:£ Alecto and Hippothoa 

 from the Lower Silurian of Ohio, with a Description of Aulopora arachnoidea. 



Prof. A. Nicholson, M.D., D.Sc. — Description of New Polyzoa from the Lower 

 and Upper Silurian Rocks of North America. 



Prof. A. Nicholson, M.D., D.Sc. — On Favistella stellata, and Favistella calicina, 

 with Notes on the Affinities of Favistella and Allied Genera. 



W. Pettgelly, F.R.S. — Tenth Report of the Committee for Exploring Kent's 

 Cavern, Torquay. 



P. H. Tiddema7i, F.G.S. — Report of the Committee for assisting in the Explor- 

 ation of the Settle Caves (Victoria Cafe). 



Sir Willoughby Jones, F.R.G.S. — (Communicated by). Notes on Cavern Explor- 

 ations in the Pyrennees by M. Frossard. 



W. Chandler Roberts, F.G.S.— On the Columnar Form of Basalt. 



I'F. H. Baily, F.G.S. — On the Coal-measure Fossils of Ireland. 



G. H. Kinahan, F.G.S. — Geological Maps and Sections of West Galway and 

 South- West Mayo, see anth p. 453. 



W. Jolly — Third Report of the Committee for Collecting Fossils from Localities 

 Difficult of Access in North- Western Scotland. 



