284 TEMPERATURE IN THE CLIFFORD AMALGAMATED MINES. 



have lately received new appellations ; and thus the so-called " hot 

 spring," met with a few years ago in the United Mines, is now, 

 by a different arrangement of the Setts, included in the group 

 known as the Chfford Amalgamated Mines."* 



The lodes of the United and Clifford Mines consist in great 

 measure of quartzose and slaty matter, associated, however, with 

 larger quantities of yellow copper ore than have been obtained 

 from any other tract in the County of equal extent, as well as 

 with smaller proportions of many other minerals. 



During the last half-century the undermentioned temperatures 

 of the streams entering them, were ascertained at intervals, by 

 different observers : — 



Beside these, however, many observations have been made on 

 the temperatures of the rocks, the lodes, the cross-courses, and the 

 air ; but for such I beg permission to refer to the publications of 

 the several observers. 



When unhappily it became necessary to abandon the deeper 

 works, I thought that as ojDportunity for re-examining them might 



* Smyth, Reports of the British Association, xxxiv (1864), Part ii, p. 70 ; 

 Mining and Smelting Magazine, vi, pp. 193 — 6. 



f Fox, Cornwall Geol. Trans., ii, pp. 20—3, Table 1. 



I Henwood, ibid, v, p. 398. 



§ Fox, Reports of the Royal Cornwall Polytechnic Society, xiv (1837), p. 1. 



II Smyth, Reports of the British Association, xxxiv (1864), Part ii, p. 70; 

 Mining and Smelting Magazine, vi, pp. 193—6. 



1[Fox, Reports of the British Association, xsvii (1857), p. 98. 



** Francis (junr.), Reports of the Royal Cornwall Polytechnic Society, 

 xiv (1837), p. 9. ^ 



