540 Intelligence and Miscellaneous Articles. 



Everywhere eastward the Wheal Laity lode is but a single vein, 

 of about a foot and a half wide, and composed of quartz, earthy 

 brown iron-ore, greenish, and in some places brick-red felspar, a 

 little tin-ore, together with some vitreous copper-ore and iron pyrites. 

 Westward, however, it consists of at least two separate veins, called 

 for distinction sake the Wheal Laity north and south lodes; and some- 

 times there is also a third vein. At one spot the third vein is simply 

 crystallized fels])ar, and the axes of the crystals are parallel to each 

 other, but lie across the vein ; in other parts it is slightly productive 

 of tin-ore. The Wheal Laity north, and Wheal Laity south lodes, in 

 o-eneral from a foot to a foot and a half in width, are occasionally 

 much wider. Greenish felspar, quartz, schorl, and occasionally brown 

 iron-ore, are their chief ingredients : in some parts both veins are 

 rich in tin-ore ; vitreous copper ore, copper and iron pyrites also 

 occur, but are not common constituents. In the deepest part of the 

 mine {i. e. at 150 fathoms deep) the Wheal Laity north lode is for 

 some fathoms in length about two feet in width, and is then com- 

 posed of chlorite, vitreous copper ore, and iron pyrites, and has a 

 vein of rather fine-grained granite on one side. At a depth of 120 

 fathoms, and about 60 fathoms west of the portions already described, 

 where the same fade consists of granite, quartz, red iron-ore, and a 

 little tin-ore, there is connected with its northern side {foot-wall) an 

 offshoot or excrescence about 4 fathoms in all directions, but most 

 irregular in figure, and having many small vein-like branches. This 

 mass, consisting chiefly of chlorite, quartz, and iron pyrites, is not 

 only far richer in tin-ore than the adjoining portion of the lode, but 

 is remarkably different in mineral composition. We have thus the 

 same ore richly impregnating, not only the Wheal Comfort lode and 

 the " Carbona," two parallel but entirely dissimilar deposits, but also 

 the Wheal Laity lode, which has a direction nearly at right angles 

 to them. 



(c.) The intersections of the lodes just mentioned exhibit almost 

 an epitome of that class of phaenomena. 



(1.) The Wheal Laity and the Wheal Comfort lodes cross each 

 other ; still at some levels there is no evidence to show that either 

 is cut through ; whilst at others the Wheal Comfort lode not only 

 intersects, but also heaves the Wheal Laity lode. It is not the least 

 remarkable circumstance attending this intersection that the Wheal 

 Laity lode is a single vein everywhere eastward of the Wheal Comfort 

 lode, whereas westward of their contact it is divided into two, and in 

 some places even into three distinct and separate veins. 



(2.) All these veins are intersected by the Cross-course, and all 

 are heaved by it ; the two larger (the Wheal Laity north and the 

 Wheal Laity south lode?) in general from 10 to 15 fathoms ; the dis- 

 placement of the smaller vein is, however, much less considerable, 

 and does not exceed six fathoms and a half. 



Again, notwithstanding the Wheal Comfort lode and the Cross- 

 course have ojjposite inclinations, they respectively heave the Wheal 

 Laity lodes in the same direction. 



At a depth of 110 fathoms, where the Wheal Laity north lode is 



