450 REMNANTS OF EXTINCT VOLCANOES. 



Since 1884 the rocks of the Lizard district have received 

 the particular attention of our greatest geologists and petrolo- 

 gists, each introducing his own theory as to their development, 

 which has complicated, rather than simplified matters, hence the 

 problem, so far as collective opinion goes, is still unsolved. Mr. 

 J. J. H. Teale's admission at the end of a paper, shewing 

 great research, read before the G-eological Society of London, 

 that he was not prepared with an answer as to their true origin, 

 is what most workers in this field have had likewise to admit. 



Erom amongst the various sections of Cornish rocks which I 

 exhibited at a conversazione given by this Institution in honour of 

 the visit of the Geologists' Association in August, 1887, I shortly 

 after selected and sent sixty slides to Professor Judd, F.E.S., 

 for inspection. He was particularly struck with those from 

 Coverack, his opinion being that they corresponded with certain 

 Tertiary Gabbros, which are of volcanic origin, in the Western 

 Isles of Scotland.* 



Now mark the change ! Mr. Howard Fox, a petrologist of 

 no mean order, on hearing Professor Judd's opinion respecting 

 our Cornish rocks, informed me he had made Mr. Teale ac- 

 quainted with that opinion ; on the 8th of May, 1888, Mr. Teale 

 read a paper before the Mineralogical Society,* entitled " notes 

 on some minerals from the Lizard," in which he stated that he 

 had discovered that the Gabbros at Coverack bore a resemblance 

 to those described by Professor Judd from the Western Islands 

 of Scotland, which was undoubtedly correct. Professor Judd hav- 

 ing seen my slides, communicated such to me in the previous 

 December. 



In the same month, May, 1888, Mr. Howard Fox read a 

 paper before the Geological Society of London, in which he 

 contended that the Lizard rocks were chiefly a metamorphosed 

 mass ; in which view he was supported by Mr. Teale. 



There are probably other papers in various publications 

 which I have not seen, but one of local interest is that read by 

 Mr. E. A. Wiinsch, before the members of the Eoyal Institution 



* Quat. Jour. Geo. Sec. vol. 42, p. 42. 



* Mineralogical Magazine and Journal, vol. 8, p. 116, Oct., 1888. 



