164 PEOE. T. G. EOKtfEY OX THE LITHOLOGICAE 



were, fused with the ground-mass, and the granules of it one with 

 another. Here, indeed, we seem to have a record of an original 

 structure ; and it is noteworthy that the felspar closely resembles 

 that occurring, certainly in derivative fragments, in group I. Still 

 I think the rock, on the whole, is nearer to II.* 



13 (a mile south of Strome, on road to Duncraig). Like 11, this has 

 undergone so much crushing and recementation that it is difficult to 

 come to a conclusion about it. The felspar is crowded with mica 

 films and secondary minerals, some possibly fibrolite. 



14 (shore of Loch Carron, south of Strome Perry). A compact 

 rather flaggy dull green and reddish schist, consisting microscopically 

 of quartz and the usual mica with microliths of hornblende, and 

 occasional larger grains of felspar and quartz. Structurally this 

 rather resembles series I. ; but the alteration is considerable,, so that 

 field evidence must decide whether it be grouped with it or with II. 



15 (at Strome Perry). A dull green slightly schistose rock rich in 

 hornblende. Microscopically it consists of quartz and hornblende — 

 the latter well cleaved, but irregular in external form, with a fair 

 amount of sphene, a little felspar and numerous secondary micro- 

 liths, aluminous and magnesian. On the whole I think this most 

 resembles II. 



16 (the same locality). A dull green slightly schistose rock, streaked 

 with pale red and yellowish green. Microscopically it consists mainly 

 of quartz, hornblende, and epidote, often rather impure. For mineral 

 condition cf. No. 15. The rock has been crushed, which at any rate 

 partly, perhaps wholly, accounts for its fragmental aspect. 



17 (the same locality). A claret-red schistose rock, with little 

 whitish specks. The general microscopic structure resembles No. 

 4 ; but there is less quartz, a good deal of ferrite, and considerable 

 evidence of decomposition. 



At Dr. Hicks's request I have paid particular attention to the 

 structure of these rocks (13-17). They present similar difficulties 

 to No. 12 ; but on the whole I think they group best with II., though 

 here and there one seems able to identify original constituents 

 more easily than is usual in this division. 



18 (hill north of Attadale Station). A reddish, rather compact 

 gneiss, poor in mica. Its microscopic structure is thoroughly cha- 

 racteristic of series II. ; it contains two kinds of mica (neither 

 abundant), a very few garnets, and a little epidote. 



19 (north side of Attadale Valley, near Farm). Macroscopically 

 and microscopically very like No. 10, but perhaps a little more altered, 

 so that we may with more confidence group this with II. A little 

 epidote is present. 



20 (roadside, east of above). A moderately fine-grained gneiss, 



~* Since writing the above, I have had the opportunity of examining another 

 rock from this group, a rather compact-looking pinkish gneiss. Here, too, 

 the rock, while macroscopically and, in some respects, microscopically, resembling 

 series II., has certainly a fragmental aspect. Though the evidence is not decisive, 

 I strongly incline to consider this aspect illusory and indicative only of subse- 

 quent crushing, and to refer both the rocks to the older series. 



