198 ON THE DETRITAL TIN-ORE OF CORNWALL. 
kind, was wrought,—by aid of a small high-pressure pumping- 
engine—for several years. : 
The comparatively small body of granite* extending from Go- 
dolphin-hill to the sea,—the slate} bounding it landward,—and 
the elvanst traversing both granite and slate—are all intersected by 
numerous Jodes which take an average direction of about 16° N. of 
E.—-S. of W.§ Of these a few have afforded the ores of copper ; 
but all other have been, and still are rich in tin-ore, of which, 
indeed, this district is one of the most productive in Cornwall. || 
The southern part of the tract is drained by the short deep 
glen which reaches the coast at Porthleaven ; but it bears slight 
traces of ancient tin-streaming. 
The streams which rise on the north-western, northern, and 
north-eastern slopes of Godolphin, unite with rivulets from 
Clowance and Skewes in Crowan; and, together, they find 
their way to the north coast at Hayle. At Saint Erth the 
Some forty years ago the reedy tarn which forms part of Marazion 
marsh abounded with water-lilies; but when operations were resumed at 
Wheal Darlington (the Bog mine), the entire tract was drained, and the peat 
it contained supplied the neighbourhood with fuel. As soon as the works 
were abandoned, however, the ground was again overflowed; the rootlets 
which had escaped the ravages of the cottagers again put forth shoots, and— 
after an interval of, perhaps, thirty years—leaves and flowers have lately re- 
appeared. 
* Borlase, Natural History, p. 99. Sedgwick, Trans: Cambridge Phil: 
Society, i, p. 111. Boase, Cornwall Geol: Trans: iv, p. 354. Henwood, 
Ibid, v, p. 48. Dela Beche, Report on the Geology of Cornwall, &c., p. 162. 
Haughton, Proceedings of the Royal Society, xvii, pp. 209-11. 
+ Hawkins, Cornwall Geol: Trans: ii, p. 380. Sedgwick, Trans: Cam- 
bridge Phil: Society, i, p. 117. Thomas, (R.) Mining Review, No. ix, p. 20. 
Boase, Cornwall Geol: Trans: iv, pp. 348, 350. De la Beche, Report, p. 
100. Henwood, Cornwall Geol: Trans: v, p. 47. 
t Carne, Cornwall Geol: Trans: i, p. 102; ii, p. 83. Sedgwick, Trans: 
Camb: Phil: Society, i, p. 129. Boase, Cornwall Geol: Trans: iv, p. 354; 
Primary Geology, p.57, Fig. 3. De la Beche, Report, p. 175. Henwood, 
Cornwall Geol: Trans: v, p. 51. 
§ Ibid, v, p. 250; vili, p. 674; Journal of the Royal Institution of 
Cornwall, No. xiii, p. Xvi. 
|| Carew, Survey of Cornwall, p. 153. Hitchins and Drew, History of 
Cornwall, ii, p. 116. Henwood, Cornwall Geol: Trans: v, p. 53; viii, p. 
446. Blight, Churches of West Cornwall, p. 72. Parochial History of Corn- 
wall, i, p. 140. 
