232 
under a volcanic cokeing process for a prolonged but indefinite 
geological time. 
Il. Granvutires—(1) A compressed account of some ex- 
amples of these granitoids from widely different areas, such as: 
a. South of France c. Malvern Hill 
b. Channel Islands d. Saxony 
(2) The behaviour of some granulites, when reduced by 
fusion to the vitreous state. 
Ill. Porruyrires.—Notice of a singular instance of a 
porphyritic granite from the Venetian Tyrol, which had been 
accidentally burnt in the Church of St. Zanipolo, Venice. 
IV. On the cohesion of the constituent minerals of the 
granites, &c., on their molecular constitution, and the sources 
of weakness in structure. 
V. Summary of the results. 
APPENDIX 
Designation of the degrees of higher temperature, by 
various authorities. 
I. GRANITES— 
1. The kind of granite forming the pillars supporting the 
arcade of the nave in Newnham Church, Forest of Dean, is 
generally known by builders and others as “‘ Aberdeen Red,” 
whether from the Peterhead or from the Aberdeen district. It 
is most likely, a granite, considered to be of igneous origin, and 
which is extensively quarried at Sterlinghill, situated 4 miles 
South of Peterhead. In weight this stone averages nearly 
166 lbs. to the cubic foot, has an even, uniform grain, and 
possesses crystals of a moderate size, running on the whole 
rather smaller than those in the Cornish and Devonshire granites. 
The order of consolidation of the chief or essential minerals in 
this rock, would be in the order 1. Mica, 2. Felspar, 3. Quartz. 
The quartz is crystalline, of grey or sometimes smoke colour, 
and accompanied by some Plagioclase and the two alkaline 
felspars, Orthoclase and Albite. The Orthoclase or potash 
felspar is of fine carnation tint, which contributes not a little to 
the beauty of the stone. It crystallises in the oblique or 
