APPENDIX.                                                547

information of the Hon. James Howard, the Chief Commissioner of Woods and
Forests, I am enabled to state as follows.

This mine, which produced in the latter half-year of 1860 a profit of £163
only, gave gold to the value of £6030 in 1861; and in the year 1862 the yield
rose to 24,066 (6181-126 oz. of gold from 620| tons of vein-stuff"). In 1863 the
profit was £2257 ; in 1864 it.was £9061; in 1865 £2320; and only £512 in
1866. In the present year, however, there has been a great increase in the
produce,—£1920 having been realized according to the accounts for the first
half-year, whilst £1900 is the estimated produce in the succeeding month.

A very recent examination of the gold-bearing quartz-lodes in the neighbour¬
hood of DolgeUy by Mr. David Forbes, led him to consider that these lodes are
seldom or only faintly auriferous, except when they cut through the Lower
Lingula-flags of that district.

From the explorations hitherto made, it appears that where these lodes had
been worked deeper into the Cambrian grits they turned out to be sterile, or to
contain merely traces of gold. There further appeared to Mr. D. Forbes to be
an intimate connexion between the auriferous deposits and the intrusive rocks
(probably diabase) of the district, marked as ' greenstones' on the Geological
Survey Map: the richer parts of the Vigra and Clogau gold-mines occurred
where the lode, in cutting through the Lower Silurian strata, had encountered
such rocks.

Q.—Eozoon in a Calcareous condition (p. 13).

Since the text was printed, a specimen of Eozoon Canadense, examined by
Principal Dawson and Dr. Carpenter, has been found wholly composed of carbo¬
nate of lime, as is the case with most fossils, without the serpentinous materials
that so much resemble asbestiform and other minerals as to mislead some ob¬
servers. This specimen, showing characters that correspond with those in the
serpentinous specimens, was found in the Laurentian rocks at Tudor, Hastings
County, Canada West; and it seems to have been a young individual, broken
off and buried in calcareous mud which has become a micaceous limestone (or
calcareous schist), on the surface of a layer of which it lies exposed by weather¬
ing.—Canadian Geol. Survey, Report of Progress, 1866, pp. 17 &c., and Geol.
Soc. London Proceedings, May 8,1867.

R.—Foraminiferal Character ofthe Silurian Stromatopora (p. 218).

In connexion with the occurrence of such Foraminifera of a large size as
Eozoon in the oldest known rocks, it is well to keep in view that Receptaculites
has apparently some cm'ious points of aUiance with the Foraminifera (as indi¬
cated by Mr. Salter), and that, in support of Principal Dawson's suggestion
that some of the obscure zoophytic forms (such as Stromatopora) in the SUurian
rocks might prove to be Foraminifera also. Dr. Carpenter finds good groimds to
remark as foUows (in a letter to Professor Rupert Jones) :—

" Burlington House, June 12, 1867.

....."I have examined aU your specimens of Stromatopora [S. striatella,

from the Wenlock beds], and do not find any of them in good condition for
showing the structure. The sheU-walls (P) have undergone a change into crys¬
talline calcite, and are not clearly differentiated from the matrix which fiUs the
cavities. In this respect, however, the condition of these fossUs corresponds
closely with that of Palaeozoic Foraminifera in general, such as the Fusulina