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 620f tons of vein-stuff). In 1863 the 
profit was £2257 j 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 Dolgelly 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. 
E. — Foraminiferal Character of the 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 curious points of alliance 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 Silurian 
rocks might prove to be Foraminifera also, Dr. Carpenter finds good grounds to 
remark as follows (in a letter to Professor Rupert Jones) : — 
" Burlington House, June 12, 1867. 
I have examined all 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 shell-walls (?) have undergone a change into crys- 
talline calcite, and are not clearly differentiated from the matrix which fills the 
cavities. In this respect, however, the condition of these fossils corresponds 
closely with that of Palseozoic Foraminifera in general, such as the Fusulina 
