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an Italian term. The distinctive component of the Gabbros, 
also called Serpentinites, are the minerals Labradorite and 
Diallage. The occurrence of this beautiful rock at the Lizard 
Point, in Cornwall, together with masses of Serpentine Ophite) 
in contact, and their origin as an altered rock from the 
decomposition of Olivine (Peridot) was enlarged on. The 
whole subject has been examined diligently by Professor Bonnzy 
(Q. J. Geol. Soc. Vol. XXXIIT), and more lately by Professor 
Kine and another, in a paper read before the Royal Society of 
London, in 1880. The precise reference is this—On the Origin 
of the Mineral, Structural, and Chemical Characters of Ophites 
and Related Rocks, a Paper read at the Royal Society by Professors 
W. Kine, Sc. D., and T. H. Rowney, Po. D. (1880). Examples 
of these rocks were shown. 
A short account was given of the eruptive rocks of Charfield; 
they are the same as those at Damory Bridge, amygdaloidal 
Diorites, having the cavities for the most part filled with Calcite, 
and many lined with a green zeolitic mineral, called Viridite. 
On a farm known as Crockley’s, near Charfield, were found 
queer flinty circular bodies, flat on one side, about 8 inches in 
diameter by 34 inches thick—the country people know them as 
“buns.” They seem to weather out of the Igneous rock, and 
in fact they correspond to the so-called “‘slag-cakes” or 
“volcanic bombs” that are now ejected at times from active 
volcanic craters. 
The correspondence of the volcanic areas of the Western 
Isles of Scotland, such as Mull and Rum, with that of the 
Schemnitz mining district in Hungary, both being contempo- 
raneous Neogene (Upper Miocene of Lyxriu), was discussed and 
illustrated. Itis a subject of surpassing interest to Petrologists. 
Professor Jupp, of the School of Mines, went into Hungary— 
fresh from the Hebridean volcanoes—at the instance of the 
late Sir Cuartes Lyett and Col. Scrorn, to study the old 
Schemnitz voleano, whose heart is now blown out. 
Over an area of about fifty square miles, now covered with 
volcanic rocks, can be studied the internal economy of an 
exhausted fiery reservoir, the ruins in fact of a huge Etna of 
