ON THE DETRITAL TIN-ORE OF CORNWALL. 209 
Of clothing, ornament, tool, or weapon no trace was discovered. 
The works were carried on by a Company* which had recently 
established, in the immediate neighbourhood, the first manu- 
factory of white arsenic (arsenious acid){ in the United Kingdom ; 
and both were superintended by Mr. John Rowse, a person of 
much information, sagacity and prudence. The stones, gravel, 
and silt were, therefore, carefully removed, and the skeleton as 
well as the wood which surrounded it, were scrupulously pro- 
tected from displacement, until they had been carefully examined. 
And in order to satisfy the deep and general interest which pre- 
vailed, the remains were, for some time, open to public inspection ; 
and—as my home was scarcely a mile distant,—I visited the spot 
daily. At length the skeleton was taken into safe keeping; and 
in 1827 it was presented to the Royal Institution of Cornwail. 
The central district,§ which attains, at Hensbarrow, an eleva- 
tion of more than a thousand feet,|| consists of granite, of slate 
sometimes interlaid with hornblendic rocks sometimes charged 
with organic remains,** and of ¢lvans intersecting both granite 
and slate. A considerable part of this region affords the slightly- 
coherent talcose granite,{{ whence the manufacturers of porcelain, 
* Boase and Courtney, Bibliotheca Cornubiensis, i, p. 136. 
+ Henwood, Cornwall Geol: Trans: v, p. 86.# 
+ Ibid, iv, p. 162. 
§ This district is bounded by a line drawn from Wadebridge to Lost- 
withiel; and by another line through Truro-river to the Gannel. Boasz, 
Cornwall Geol: Trans: iv, p. 234. 
“‘Tanivet Tower, two miles west of Bodmin, is by common repute the 
centre of Cornwall.” 
Wauuis, Bodmin Register, p. 103; Cornwall Register, p. 199. 
|| Trigonometrical Survey. De la Beche, Report on the Geology of 
Cornwall, éc., pp. 7, 14. 
q Boase, Cornwall Geol: Trans: iv, pp. 262, 276. De la Beche, Report, 
p- i Phillips, (J. A.), London, Hdin: and Dublin Phil: Mag., xii, pp. 
Ori, Bs 
** De la Beche, Report, p. 351. Henwood, Cornwall Geol: Trans: v, 
pp. 125, 158. 
t+ Bonnard, Journal des Mines, xiv, p. 448. Deluc, Geological Travels 
iii, p. 342. Berger, Geol: Trans: (O.8.), i, p. 125. Thomson, Annals of 
Philosophy, ii, p. 349. Fitton, /bid, ii, p. 180. Conybeare, (J. J.), Ibid, v, 
p. 186. Dutrénoy, De Beaumont, Coste et Perdonnet, Voyage Métallurgique 
en Angleterre, ii, p. 187. Boase, Cornwall Geol: Trans: iv, p. 235; Phil: 
Mag: and Annals, x, p. 348. Hawkins, Cornwall Geol: Trans: iv, p. 475. 
De la Beche, Report on the Geology of Cornwall, &c., pp. 159, 509. Henwood, 
Cornwall Geol: Trans: v, p. 115. 
