‘Remarks on the Transition Rocks of Werner. 101 
lake is a mine of Copper in Granite; and a little 
beyond, at Drakewalls, there is another of Tin -in 
‘No. ° | Killas. 
22. Tin-vein in Granite, from Carclaze, ‘near St. Austle. 
23. Killas found on the road from St. Austle to Carclaze; 
this I consider a very perfect specimen of Grau- 
vacke, 4 
24. Mass of white Quartz, of which the roads-are formed. 
25. Mixture of crystallized Quartz and Wolfram, covered 
with a coating of Bitumen, found in Poldice mine 
near Redruth, at the depth of 106 fathoms, in 
Granite. 
26. Arsenical Pyrites, mixed with acicular, dark, greenish- 
gray crystals, supposed to be actinolite, from Bla- 
ney’s Shafi, a branch of Wheal Unity. 
27. Granite, Cairn Brae. 
28. From a vein which traverses the north-east side of 
Cairn Brae: on the spot it appeared to me to be 
Clay-Porphyry; in hand specimens it resembles fine- 
grained Granite. 
“29. Vein-stone of Quartz, impregnated with red Oxide of 
Tron, and containing white Steatite, from Tincroft. 
30. From the high-road near Tineroft. \This is a very 
tough rock, and very fine-grained: it appears to be 
, a variety of Greenstone similar to No. 10. 
31. Kallas, marked with dark-coloured spots, from the side 
of the road to Cambourn, a little westward of the 
last. 7 
32. Killas of a light-eray colour, from St. Anns. 
$3. Irom Beacon Hill, a conglomerate formed of the de- 
bris of Granite, very similar to some varieties of 
Sandstone. 
34,35.Granite from the Land’s End. r 
-36,37.Hornblend-rock from Botallock, a curious, little, but 
valuable mine, on the north side of the peninsula, 
"y near the extremity, 
38. Cockle, massive Tourmaline, from the same place. 
39-41.Specimens from the junction of the Granite and 
Killas, at St. Michael’s Mount, 
42,43.From the shore near Penzance: these [ consider to 
be Killas of a very tough and compact variety, they 
are found very near Granite, or some similar rock, 
which presented something so peculiar in the aspect, 
~ that T cannot help recommending it to the attention 
of geologists, 
G3 No. 
