136 Proceedings of the Cambridge Philosophical Society. 
thor concluded by observing, that the situation in which these 
bones were found, agrees with what Cuvier had previously de- 
termined, viz. That the bones of species which are the same 
with those which still exist alive, are never found except in the 
very latest alluvial deposits, or those which are either formed on 
tlie sides of rivers, or-on the bottoms of ancien t lakes or marshes^'' 
March 20. — 1. A paper was read on the Geology of Cornwall, 
and some other parts of the West of England, by Professor Sedg- 
wick. The first part of the paper was devoted to some general con- 
siderations on the structure of the county. The phenomena 
presented by the granitic tracts were afterwards described. 
All the points on the coast where the granite and slate are seen 
in contact, were enumerated, and a minute account was given 
of the singular appearances exhibited at the junction of the 
two formations between Porth-Leven and Mirazion. From a 
general consideration of these phenomena, the author endeavour- 
ed to establish the following conclusions. (1.) That on a great 
scale the killas rocks conform to the granite ; but that at the 
line of contact, the slaty laminae do not appear to exhibit any 
disposition towards conformity with the irregularities of the 
surface on which they repose. (2.) That in all situations where 
there is a good denudation, (and, therefore, by analogy, through- 
out the whole contact of the granite and the slate,) many pro- 
longations of the central granite pass into the superincumbent 
.schist, and by their varied ramifications, which have every pos- 
sible inclination and direction, produce the phenomena of gra- 
nite veins. (3.) That these veins, with very limited exceptions, 
produce no alteration in the dip or line of direction of the schis- 
tose masses with which they are associated. (4.) That in the 
few instances in which metalliferous bodies intersect the beds 
which contain granite veins, both the killas and the veins con-* 
tained in it, have undergone the same disturbance. (5.) That 
it is probable that the granite veins are cotemporaneous with 
the rock which they traverse, &c. &c. The reading of the re- 
maining portion of the paper was postponed. 
2. A Translation (by Mr Thompson of St John's Coll.) from 
Gemmclaro's MS. account of the eruption of .<3Etna in 1819, 
was read. 
