ON THE DETRITAL TIN-ORE OF CORNWALL. 221 
Tremethick, only in a smaller degree. These remarkable articles 
—together with some Stream-tin-ore from the same place—were 
taken to Trethellan-house for sale; and, as assay showed them to 
be of the purest metal, both were bought for conversion into some 
Fig. 5. Tin Pan and Cover. From Treloy, Saint Columb-minor. 
Discovered in Tin-ground which had been previously wrought. 
Presented to the Rovan GroLocicaL Society or CoRNWALL 
by H.S. Boase, U.D., F.R.S., £.G.S., of Dundee. 
Drawn By Mr. H. M. Grorrrot. 
Mit i) i 
iy yy 
ily y] 
oe a Hi i o 
ae aw h Ve 
Diameter 14 inches. Depth 4:75 inches. Thickness 0°12 inch, 
saleable shape. Happily, however, Dr. H. 8. BoAsz,—then a 
Partner in the Smelting Company—was present at the moment, 
and preserved them from destruction. 
Between Lanherne and Mawgan Porth several alternations of 
mud, sand, and gravel, here and there mixed with large stones, 
overlie a mingled mass of - branches, leaves, nuts, and other 
vegetable remains, which rests on a thin bed of poor tin-ground.* 
Early in the fourteenth century more than two-thirds of the 
* Mr. William Leddicote, Superintendent of the works, MS. 
D2 
