Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 1062
s of the Roche Castle rock, in Pembrokeshire,have had their porphyritic felspars changed into quartz by thisagency. Whilst treating of the metamorphosis caused by atmo-pheric agencies, mention should be made of the fact that a movementis now in progress to assist the selection of building stones… … IOOO THE MICROSCOPE Ds GEOLOGICAL INVESTIGATION the rocks proposed to be employed.1 Obviously an increase in volumegoes hand in hand with the decomposition of a constituent, and thismay seriously atfect the stability of the rock as a mass. The intrusion of an igneous rock has generally an…
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