XXV1 
ever, contains the first two in larger, but the last in smaller, pro- 
portion than the vein-stones of adjacent tin-lodes. The bunches, 
threads, vein-like masses, and other off-shoots from all sides of 
both, together with their numerous reticulations in the contiguous 
rock, form no unimportant addition to their produce. Between- 
them and the containing granite a gradual assimilation sometimes 
takes place; but from one to the other, the passage is often abrupt 
and mmediate. Metallic matter is, perhaps, distributed less uni- 
formly in them than in the neighbouring Jodes; but portions of 
both have been exceedingly rich. Similar, but smaller, off-shoots 
spring from the lodes of several neighbouring mines; but those 
(the so-called Carbonas*) of the Saint [ves Consolidated + and of the 
Providence mines only have been wrought to advantage ; of these 
only, the produce during the last forty years has, however, realized 
more than one million and a half sterling. 
Masses of felspathic, schorlaceous, and quartzose matter, more 
or less mixed with tin-ore,{ are sometimes isolated in the granite 
of the same region. 
A numerous and an important, though generally an unpro- 
ductive, class of veins, is known as Gwides§ in one district, as 
Trawns\| 1 another, and—as quartz or clay is their chief consti- 
tuent—as Cross-courses™ and Flucans** elsewhere. Now and then 
* This term—an unknown one in any other part of the County—was 
applied, some sixty years since, to a similar formation wrought in the ad- 
joining mine of Rosewall-Hill. Whether the prevalent opinion that it was 
a cant word then current in the neighbourhood, is, or is not, correct we have 
now no means of ascertaining; but there seems little doubt that it was first 
employed by persons who were unacquainted with the ancient language of 
Cornwall. 
+ Fine specimens of blistered copper-pyrites and magnificent crystals 
' of vitreous copper are still obtained from this deposit. 
+ Hawkins, Cornwall Geol: Trans: ii., p. 31. Henwood, /bid, v., p. 20. 
Salmon, Mining and Smelting Magazine, v., p. 261. 
§ Carne, Cornwall Geol: Trans: ii., pp. 109, 323. Henwood, Hdin: 
New Phil: Journal, xxii., p..159. Fox, Reports of the Royal Corn: Pol: 
Society, iv., p. 93. 
|| Henwood, Cornwall Geol: Trans: v., p. 19. 
q Pryce, Mineral: Cornub: p. 98. Thomas, (R.), Report, p. 21. Phil- 
lips, (W.), Geol: Trans: ii., p. 184. Carne, Cornwall Geol: Trans: ii., pp. 
85, 107. Henwood, Hdin: New Phil: Journal, xxii., p. 159; Cornwall Geol: 
Trans: v., pp. 278-281, Table 106; viil., p. 681. Fox, Reports of the Royal 
Cornwall Polytechnic Society, iv., p. 83. Dela Beche, Report, pp. 301, 303, 
305, 306, 307. Von Cotta, Ore-Deposits, p. 407. 
** Pryce, Mineral: Cornub: p. 100 Berger, Geol: Trans: i., p. 165. 
Phillips, (W.), Jbid, ii., p. 134. Thomas, (R.), Report, p. 24. Carne, Corn- 
wall Geol: Trans: ii., pp. 85, 114. Hawkins, /bid, p. 229. Henwood, Jbid, 
lii., p. 329; v., p. 257, 262, 266; viii., pp. 715, 716; Hdin: New Phil: 
Journal, xxii., p. 159. Fox, Reports of the Royal Corn: Pol; Society, iv., 
- pp. 83, 88. Von Cotta, Ore-Deposiis, p. 407. 
