616 Extracts from the Minute Book of the Geological Society , 
veins are equally conspicuous. But here they, as well as the 
schistus, are in a state of disintegration, and crumble under the 
pressure of the layers. 
In walking along the shore from Campo Bay to Sea Point, you 
meet with numerous veins of basalt in the granite, varying in 
diameter from an inch to ten feet, and branching in as many 
directions as those of the granite with schistus. Here also you will 
frequently meet with detached blocks of schistus imbedded in the 
granite. 
The sandstone which forms the upper part of the Table moun- 
tain, Lion’s head, and Devil's hill, lies in horizontal strata, inter- 
sected by vertical fissures. It is of a siliceous nature, and encloses 
rounded nodules of quartz.” 
1818, June 19. 
A notice was read concerning volcanic chromate of iron. By 
Henry Warburton, Esq, m. g. s. 
The author, on presenting to the Society a specimen from the ex- 
tinct volcanoes of Hildesheim in the ci-devant department of the Kyll, 
consisting of granular peridot, coloured emerald-green by Chrome, 
and enveloping minute grains of chromate of iron, takes occasion to 
remark that the metal chrome has not hitherto been enumerated 
amongst the matters ejected by volcanoes. On the presumption of 
chrome being excluded from volcanic matters, M. Sementini, pro- 
fessor of chemistry at Rome, has founded an argument, by which he 
endeavours to prove that a red earth, which fell in Calabria* during 
a storm, is of meteoric origin. Having detected chrome in this earth, 
this metal, he argues, being an ingredient of meteoric but not of 
* Journal de Physique. March 1818. 
