where the fine fibrous, granularly schistose, and distinctly crystallized, occur together, nor does it, like that one, contain talc. Its analogy to hornblende slate in a geological view is as obvious as is the resemblance of the two minerals, and its passage into that rock is here effected by the addition of crystals of black or greenish hornblende, which gradually increase in number till the actinolite is entirely excluded.
I have in another place mentioned the regular north-easterly direction of the gneiss, and I think it interesting to remark that the actinolite rock of Glen Elg corresponds with this one, as well in direction as in quality. If a north-east[1] bearing be taken from it on the map so as to intersect Glen Elg, it will be found to touch a point near Eilan reo'ch, as near to the place of the actinolite rock there situated as it is reasonable to expect from the nature of the map, and I may add that the direction of the gneiss on both sides is correspondent. There is therefore every probability of its being a prolongation of the same bed, but to what further extent it may be traced is beyond the bounds of this investigation to enquire. The total distance included between the two points is about seven miles.
In formerly enumerating the members of the zeolite family which are to be found in Sky I mentioned laumonite on the authority of others, although I do not know the name of the individual to whom the discovery is attributed. Since that period I have myself found it in the same place between Loch Eynort and Loch Brittle in which the decomposing stilbite formerly described is to be seen.
- ↑ Allowing 24° for the variation of the needle, the bearing of this bed appears to be north-east by east, but as the variation on this coast is not at present accurately known, as no examination of local irregularities has been instituted, and as the maps themselves are erroneously laid down, I have in this as in other instances held it fruitless to state their bearings with rigid accuracy.
