I do not doubt that I either read or heard from Sharpe about the Grampians;
otherwise from my own old suspicion I should not have inserted the passage
in the manual.

The laminated rocks at Ascension are described at page 54. (541/1.
"Volcanic Islands," page 54. "Singular laminated beds alternating with and
passing into obsidian.")

As far as my experience has gone, I should speak only of clay-slate being
associated with mica-slate, for when near the metamorphic schists I have
found stratification so gone that I should not dare to speak of them as
overlying them. With respect to the difficulty of beds of quartz and
marble, this has for years startled me, and I have longed (since I have
felt its force) to have some opportunity of testing this point, for without
you are sure that the beds of quartz dip, as well as strike, parallel to
the foliation, the case is only just like true strata of sandstone included
in clay-slate and striking parallel to the cleavage of the clay-slate, but
of course with different dip (excepting in those rare cases when cleavage
and stratification are parallel). Having this difficulty before my eyes, I
was much struck with MacCulloch's statement (page 166 of my "S. America")
about marble in the metamorphic series not forming true strata.

(FIGURE 6.)

Your expectation of the metamorphic schists sending veins into neighbouring
rocks is quite new to me; but I much doubt whether you have any right to
assume fluidity from almost any amount of molecular change. I have seen in
fine volcanic sandstone clear evidence of all the calcareous matter
travelling at least 4 1/2 feet in distance to concretions on either hand
(page 113 of "S. America") (541/2. "Some of these concretions (flattened