Mr. William Phillips on the Veins of Cornwall. 151 



That of the flucans, which consisted, when in the schist, of two 

 veins of fiiican or soft marl with portions of schist between them, 

 were while in the elvan very much smaller, and their substance 

 appeared to be either a mere seam of flucan, or was of a sandy 

 nature resembling pulverized porphyry. 



The metalliferous veins likewise passed through the channel of 

 porphyry, which had no other effect upon them than that of dimi- 

 nishing the load in size ; it therefore appeared to be richer. 



The north and south vein, called Convocation Cross Course, was 

 not found to produce any silver in this mine. 



Section of the Manor Old Vein, 

 PI. 8. fig. 11. 



This section Is on the course of the vein called the Manor Old 

 Vein, on the ground plan of Herlaad and Drannack mines. It was 

 originally worked as a separate mine, under the name of Herland. 

 Its greatest depth was about 150 fathoms from the surface. 



The several cross courses and flucans correspond with those in 

 the ground plan. Halfpenny Little Flucan and Chambers's Flucan, 

 were nearly, if not quite, perpendicular to the horizon ; the under- 

 lie of the others will be seen. It will be observed on consulting 

 the ground plan, that Williams's or Penberthie's flucan traversed 

 the veins both of this mine and that of Pleasure, Fancy, and North 

 Herland mines. North and South veins generally take the name 

 of the shaft they most nearly approach. The flucan in this mine 

 was nearest to a shaft called Williams's, and therefore obtained the 

 name of Williams's flucan. In the other, it approached nearest to 

 Penberthie's shaft, and was therefore called Penberthie's flucan. 

 Both names are therefore given on the ground plan. 



