284 MlvSSKS. A. IIARKEK AND J. E. MARK OX 



Alsace*, while Yon Giimbelt mentions it as occurring in pegmatite- 

 veins in Bavaria. 



In connexion with the parallel structure in this rock, it may be 

 observed that at one place in the quarries the granite has a banded 

 appearance nor unlike some gneisses, a phenomenon doubtless due 

 to a certain fiuxional movement of the mass. In the general bulk 

 of the granite the only indication of flow is an occasional rude 

 parallelism of the long axes of the porphyritic felspars. 



It remains to allude to some other special mincralogical and tex- 

 tural modifications exhibited in certain parts of the granite mass. 

 It may be noticed that two varieties of the rock are recognized for 

 building purposes, the difference being one of colour only. In both 

 the large porphyritic felspars are of a flesh-red tint, but in the most 

 common type the other felspars of the rock are white, while in the 

 " dark " variety they too are red. The relations of the two rocks as 

 seen in the quarry suggest that the latter is a modification of the 

 former, produced by secondary actions, and connected with infiltration 

 along fissures. This is certainl)' the case with some other granites^ 

 which are red in the neighbourhood of joint-surfaces, but grey in the 

 interior. In one place in the Shap Fell quarry, extensive weathering 

 along a main divisional plane, assisted perhaps hj some degree of 

 sliding, has converted the granite for some distance into a soft, 

 greenish, earthy material. 



The ordinary granite is in some places distinctly cut by small 

 veins of a lighter coloured and somewhat finer-grained granite 

 without porphyritic crystals. Although thus clearly posterior to the 

 main intrusion, these may reasonably be referred to the same general 

 source. 



The texture of the normal granite itself seems to be very constant 

 throughout the mass of the intrusion. It does not become finer in 

 the marginal parts, nor, usually, in the nearest oflTshoots connected 

 with it, so far as our observation goes ; but the large porphyritic 

 crystals are wanting in the small ramifying veins on the border of 

 the mass, as if the narrowness of the fissures, though these are wide 

 enough to contain the felspars, had oft'ered some impediment to their 

 floating in. 



On the other hand there are, in one or two places at least, mar- 

 ginal modifications of the granite, which present a coarser texture 

 than the normal type, as well as some mincralogical dififerences. 

 This is seen on the hillside above \Yasdale Head, about 350 yards 

 N.W. of the farm. Here, at the contact with the metamorphosed 

 rocks, the granite consists almost entirely *of large crystals of pink 

 felspar, with very little quartz, and the flakes of dark mica have the 

 long blade-like habit already mentioned. Mica also occurs at the 

 same place in the form of thin films adherent upon the crystal-faces 

 of the felspar, which is partly idiomorphic. Again, the junction of 

 the granite with metamorphosed ashes (altered to the appearance of 

 mica-schist) is exposed in the tramway-cutting at the north-east 



* Rosenbusch, ' Mikr. Physiogr. d. masPig, Gest.' (1887) p. 31. 

 t Geogn. Beschr. Kijnigr. Bayern, vol. ii. p. 317. 



