150 Mr. William Phillips on the Veins of Cornwall, 



the drawing of the water being performed by the engines on Her- 

 land mine, and the name Drannack was added to Herland because 

 two of the Mines (Fancy and North Herland) united with it were 

 situated in a tenement of that name. This section therefore is that 

 of the workings of the veins designated on the ground plan by the 

 names of Pleasure, Fancy, and North Herland, north, middle and 

 south branches. It is on the course of those veins, and supposes 

 the country on the south side of them to be taken away, and of 

 course in looking at this section we look north. 



The shafts and levels which constituted the workings of these 

 mines are not laid down, because they were not completed on the 

 original, and even had they been so the present object can be as well 

 accomplished without them. This section, together with the ac- 

 companying section of Herland mine, exhibits several striking 

 geological facts. 



By this section the underlie of the several north and south veins, 

 or cross courses and flucans, which intersected the mines, will be 

 observed. 



It will also be seen that, to use the miners language, a large chan- 

 nel of elvan took its course with a very quick underlie towards the 

 west : near the surface it was about 15 fathoms thick, but diminished 

 gradually in depth. Its precise direction or extent on the surface 

 towards the north and south was not ascertained. From some 

 specimens of this channel in my possession, and of that passing 

 through Herland mine, they appear to consist of crystals of quartz 

 and felspar imbedded in compact felspar, which in one or two in- 

 stances is mingled with compact quartz. 



It merits particular notice that the substance of each cross course 

 (viz. quartz) uniformly traversed the channel of elvan, but, while 

 in it was much smaller and more compact than when in the schist. 



