49 
All our observations seemed to support the supposition 
that the divisions on the maps between the lower Silurians, 
the metamorphic and crystalline schists, and the granites 
and porphyries, are not justified by the facts. It should 
be borne in mind, however, that no detailed surveys have 
been made in the area we traversed, and that, for all 
practical purposes, and exclusive of any theories of meta¬ 
morphism suggested by the appearance of the rocks, the 
published maps are fairly accurate. We had very many 
opportunities of testing the correctness of the boundaries 
as laid down approximately in the geological sketch map, 
and, apart from the conjectures above referred to, they 
may be trusted as safe guides. 
The observations made by us, though accurate as 
regards the sites visited, do not exclude the theory that 
the silurian rocks, the mica schists, and the granites are 
really and truly separate formations. Metamorphism 
along the lines of junction of such a character as to lead 
to the inference first referred to may consist with com¬ 
plete separation into distinct formations. We have giveu 
as clearly as we can the facts observed, but it is only by 
detailed surveys and sections, and by analyses, that the 
tine geological and mineralogical character of the several 
rocks can be determined. 
About four miles north-west of Ensay we were shown 
a vein of epidote rock (epidosite), a dense mixture of 
epidote and quartz with some flesh-colored felspar (ortho- 
clase), occurring near the junction of the granite and 
metamorphosed schists. One other specimen picked up 
on the road in this locality was crystalline on the face 
of a joint in a granitic rock. The crystals are small, 
divergent, and in color pistachio-green to olive-green. 
The specimens have been placed in the collection of the 
n 
