Geological Society of London. 183 
III.—March 14, 1888.—W. T. Blanford, LL.D., F.R.S., President, 
in the Chair. 
The President announced that it is proposed to build, in memory 
of the late Mr. Champernowne, a moderate-sized cottage hospital 
in Totnes. Mr. Champernowne was greatly interested in a tem- 
porary hospital, erected in 1885, and was anxious that a permanent 
institution should be established for the same purpose. The cost is 
estimated at about £900 or £1000, of which between £500 and £600 
have been subscribed in sums varying from a few shillings upwards. 
Fellows of the Society wishing to contribute to this memorial should 
send at once to Dr. Currie, Bridgetown, Totnes, Devonshire, or to 
Archibald Geikie, Esq., F.R.S., 28, Jermyn Street, 5.W. 
The following communications were read :— 
1. “On the Gneissic Rocks off the Lizard.’ By Howard Fox, Hsq., 
F.G.S., with Notes on Specimens by J. J. H. Teall, Esq., F'.G.S. 
The rocks may be classed under three heads :—(i.) the coarse 
gneisses of Mén Hyr type, (ii.) the light-banded granulitic gneisses or 
Wiltshire type, and (iii.) the transition micaceous rocks of “ Labham 
Reefs,” type intermediate between (ii.) and the mainland schists. 
The first are seen in Mulvin, Taylor’s Rock, Man-of-war Rocks, 
the Stags, Men Par, Dlidgas, Mén Hyr, and Vasiler; the second in 
Sanspareil, the Quadrant, and adjoining reefs, Labham Rocks, ete. ; 
and the third in the Labham Reets. 
The inclination of the divisional planes appeared conformable 
with that of the rocks of the mainland. 
The genisses and granulites of several of the islands are traversed 
by numerous dykes of porphyritic basic rock, seen in Taylor’s Rock, 
Man-of-war Rocks, Sanspareil, Quadrant Rock and Shoals, and Clidgas. 
These dykes have been disturbed by movements subsequent to their 
intrusion. They sometimes strike across the foliation-planes of the 
eneiss and send veins into the latter rock ; at other times the strike 
is parallel to that of the foliation-planes; the two modes of occurrence 
are occasionally observable in different portions of the course of the 
same dyke, e.g. in one traversing that part of the Man-of-war group 
known asthe Spire. This dyke is also noticeable from the fact that 
it appears to be traversed by veins of gneiss. 
The dykes vary in width from 18 inches to several feet. 
Tn his notes on the specimens Mr. Teall says that the rocks may 
be arranged in four groups :— 
1. Principally occurring in the outer islands, are of the Mén Hyr 
type. consisting of felspar, quartz, dark mica, and hornblende; the 
quartz and felspar sometimes exhibit relations characteristic of 
igneous rocks, at other times they form a fine-grained granulitic 
aggregate, the latter being probably the result of dynamic meta- 
morphism. This granulation is carried to a greater extent in 
some of the islands, as in Taylor’s Rock. The rocks possess the 
mineralogical composition of quartz diorite, and may be termed 
tonalite-gneisses ; they may originally have been eruptive tonalites. 
