44:4 Mr. Henwood on the Rocks and Veins 
heaved in the same direction ; whilst less than one per cent. is 
heaved to the opposite side. On the other hand, of the cross- 
veins which traverse two or three lodes each, 8°8 per cent. 
simply intersect one of the lodes, and heave the rest. And in 
almost innumerable instances, as at Dolcoath, Cook’s kitchen, 
the United and Consolidated Mines, Cardrew Downs, &c. 
(s, ¢, 2, €, &c.), the same cross-veins traverse both elvan-courses 
and lodes; and whilst the former are simply intersected, the 
latter, on either side of them, are heaved. 
Notwithstanding the greater number of lodes heaved by 
the same cross-veins is heaved in the same directions, it sel- 
dom or never happens that both, or all of them are heaved 
the same distance; which is utterly incompatible with the sup- 
position of their having originated in horizontal movements 
(d, S35 8 Ny ty Jo ky 1, &c.). 
(2.) If two lodes, with opposite inclinations, be transversely 
fractured, and one of the segments vertically elevated, whilst 
the other remains unmoved, the lodes must be heaved in 
opposite directions at all levels. ‘This is a physical necessity, 
and it is utterly impossible that any other result could follow 
such conditions. 
Let AB (Pl. IV. fig. 9,10) be the surface of a given 
tract in its original position, A! B! that of another which for- 
merly stood at the same level with, and was united to, A B, 
but which has since been elevated vertically, and which. now 
stands beyond AB. Y Z is a transverse section perpendicu- 
lar, or nearly so, to A B, and Y! Z' a similar one, in like cir- 
cumstances with regard to A! B!. 
Let also a, a! represent the superficial parts of one vein or 
lode, and 6,6! its deeper portion; c,c! the upper parts of 
another vein, and d, d' the lower. ‘The two portions respect- 
ively of either vein must be presumed to have been originally 
united and continuous, but to have been severed at the cross- 
vein w x, fig. 10. The inclinations of the two veins, it must 
be observed, are in opposite directions. 
We will suppose the original state of things restored ; A B, 
and A! B! on the same level, and a, a! and c, c' respectively 
united. Let A! B! be now perpendicularly elevated from p 
too. This movement will bring a portion of the lower parts 
of the lodes, where by their dips towards each other they are 
closer together, opposite the upper portion where they are 
further apart. 
Such a motion will evidently break the continuity of both ; 
and thus, if the portion above 7, on the line w 2, fig. 10, were 
removed by denudation or any other cause, the surface then 
presented would be that depicted in the plan (fig. 10). In 
