Reports and Proceedings— Geological Society of London. 573 



geological student has an excellent field for studying the incipient 

 stages of dynamo-thermo-metamorphism. In a work primarily in- 

 tended for mining students and the general public, it is not to be 

 expected that these subjects will be treated of in more than mere 

 outline, but it is to be hoped that a geologist, who is both a good 

 stratigraphist and petrologist, will attempt to unravel the geology 

 of the country. A careful investigation of the district and a con- 

 scientious collection of all the available facts will certainly bring 

 to light much that is new and interesting to geological students, and 

 which would in turn be of much practical value. 



I^E:poI^a?s j^is^-jd i=:ROGEEX)i3^a-s. 



Geological Society of London. 



November 6th, 1895.— Dr. Henry Woodward, F.R.S., President 

 in the Chair. ' ' 



The President announced that the Council had temporarily 

 appointed Mr. Clyde H. Black to the post of Assistant-Clerk. 



The following communications were read : — 



1. "The Serpentine, Gneissoid, and Hornblendic Rocks of the 

 Lizard District." By T. G. Bonney, D.Sc, LL.D., F.R.S., F.G.S., 

 Professor of Geology and Mineralogy in University CollegcLondon! 



After some introductory remarks the author states that in 

 company with the Rev. E. Hill, and in consequence of their work 

 in Sark, he again investigated the question of the genesis of the 

 hornblende-schists at the Lizard, and was able to overcome the 

 difficulties which formerly withheld him from attributing an igneous 

 origin to the schists themselves and their banded structiu-es to 

 fluxional movements during consolidation. Here also, as in Sark 

 tliere is some evidence of this banding being the result, at any 

 rate in places, of a mixture of a less and a more basic material. 

 Additional evidence is given as to the genesis of the granulitic 

 group and its relations to the hornblende-schist. Moreover, in 

 <onsequence of the paper by Messrs. Fox and Teall, published 

 in the Society's Journal (vol. xlix, p. 199), the author has again 

 examined (with Mr. Hill) every section which he could discover to 

 bear on the relations of the serpentine, the hornblende-schist, and 

 the granulitic rock. A number of instances are quoted where the 

 serpentine splits open or rumples the bands of the granulitic rock 

 or cuts across them. He shows that in the sections at Potstone 

 Point and elsewhere the serpentine is welded to the hornblende- 

 schist, cuts across its banding, and behaves generally as an intrusive 

 rock, while the rare cases of apparent interstratification of the 

 two prove to be the results of the inclusion and occasionally very 

 local melting down of the latter by the former rock. He maintains 

 that the relations of the serpentine to the granulitic and the 

 hornblendic groups are inexplicable on the hypothesis of an 

 igneous complex, so far as he understands the meaning of that 



