ocket and filled, between its inclosing walls
of gneiss, with a granitic mass whose elements have crystallized
separately, so that an almost complete mineralogical separation has
been effected of quartz, mica, and feldspar, while associated
aggregates, as beryl and garnet, have formed under conditions that
make them valuable gem fabrics.

The vein has a strike south of west and north of east and a distinct
dip northwest, by which it is brought below the gneiss rock, which
forms an overhanging wall, on the northerly side of the granitic mass,
while on the southerly edge the same gneiss rock makes an almost
vertical foot wall, and exhibits a sharp surface of demarkation and
contact. The rock has been worked as an open cut through short lateral
"plunges," or tunnels have been used for purposes of exploration in
the upper part of its extent. Its greatest width appears to be
fifty-one feet, and the present exposure of its length three hundred.
It undergoes compression at its upper end, and its complete extinction
upon the surface of the country at that point seems probable. At its
lower end at the foot of the slope wherein the whole mass appears, it
reveals considerable development, and affords further opportunities
for examination, and, possibly, profitable investment. It has been
formed by a powerful thrust coincident with the crumpling of the
entire region, whereby deeply seated beds have become liquefied, and
the magma either forced outward through a longitudinal vent or brought
to the surface by a process of progressive fusion as the heated
complex rose through superincumbent strata dissipated by its entrance
and contributing their substance to its contents. The present exposure
of the vein has been produced by denudation, as the coarsely
crystalline and dismembered condition of the granite, with its large
individuals of garnet and beryl, and the dense, glassy texture of the
latter, indicate a process of slow cooling and complete separation,
and for this result the congealing magma must necessarily have been
sealed in by strata through which its heat was disseminated slowly.

For upon the most cursory inspection of the vein, the eye is arrested
at once by the large masses of crystalline orthoclase, the heavy beds
of a gray, brecciated quartz and the zones and columns of large leaved
mica. It was to secure the latter that Mr. Wilson first exploited this
locality, and only latterly have the more precious contents of the