686 Chronicles of Science. [ Oct., 
to some very interesting results. The eggs of Tubularia have hitherto 
escaped the attention of naturalists. Dr. Clark accounts for this by 
the extreme minuteness of the ova, which he was unable to detect with 
a power less than the 4-inch. 
VII. MINING, MINERALOGY, AND METALLURGY. 
MiInine. 
For some years past there have issued from the ‘ Mining Record Office,’ 
one of the Departments connected with the Museum of Practical 
Geology, very complete returns of the value of our mineral produc- 
tions. From these “mineral statistics’ we learn the total value of 
our mineral produce in 1863 to have been 29,151,976/., which, when 
brought into the metallic state, at the actual cost of manufacture, was 
increased to 36,364,3271.* The more important minerals were the 
following :— 
Value at 
Tons. place of production, 
Coal 6 3 . 86,292,215 £20,572,945 
Iron ore . 9,101,552 3,240,890 
Tin . . 5 A 15,157 963,985 
Copper 210,947 1,100,554 
Lead A é qi 91,283 1,193,530 
The quantities and values of the metals obtained from these 
being :— 
Tons. Value, 
Tron, Pig 4,510,040 £11,275,100 
Tin ; ; ; 10,006 1,170,702 
Copper 14,247 1,409,608 
Lead : : , 68,220 1,418,985 
Silver obtained from 
the lead ounces 634,004 174,351 
In addition to the above, returns are given of zinc, sulphur ores, 
wolfram, arsenic, and other minerals, showing in detail, the actual 
value of every mining district in the United Kingdom. 
By the issue of these annual statistics, and by preserving records 
of all our subterranean operations, the Mrnine Recorp OFricr is 
rendering important service to all our miners and manufacturers. 
The production of gold from the quartz lodes of the Cambrian 
mountains shows a considerable falling off during 1863, the total pro- 
duce for the year being 552 oz. 12 dwts. and 19 gr. only. The pros- 
pects, this year, are however much more promising. The following 
is a return made on the 15th August: — At Castell Carn Dochan 
5 oz. and 12 dwts. of gold were obtained from 20 ewt. of quartz from 
the lode and alluvial matter; this makes a total of about 50 ounces 
obtained from that mine during this year. At the Welsh gold mine it 
* «Mineral Statistics of the United Kingdom of Great Britain and Ireland ’* for 
the year 1863, with an Appendix. By Robert Hunt, F.R.S. Published by order 
of the Lords Commissioners of Her Majesty’s Treasury. 
