A. Geikie—Crystalline Rocks of the Scottish Highlands. 15 
took place before the strata had been seriously disturbed. The 
persistent parallelism of the faults and of the prevailing 
northeasterly strike of the rocks indicates that the faulting 
and tilting were parts of one continuous process. The same 
dominant northeasterly strike extends across the whole High- 
lands, and also over the Silurian tracts of Southern Scot- 
as Archzean rocks, have been involved in it. : 
It is obvious that into the problems of Highland geology,. 
attempted ina few hasty scampers over the ground. It will 
Tequire patient, detailed mapping. But when the great base- 
lines have once been accurately traced, the difficulties will 
doubtless begin to diminish, and, like the piece of a puzzle, the 
Various segments of the Highlands will then be found to range 
themselves in their proper places.—From Nature, Nov. 13.* 
ai or extracts from the report of Messrs. Peach and Horne, and a stratigraph- 
teal section of the fault region, see beyond. 
