X¢l 
Four Specimens of Perforated Limestone, : 
ALOU NOG AVjelel cletalsielaisjatierel-ie* evclelel cleisie/ < Mr. G. F. Remfry, Truro. 
Fibrous Gypsum, from Penarth. ........ a) 
Scheifer Spar, from Botallack .......... if Rey. Saltren Rogers. 
Pitchblende, (Oxide of Uranium) from Russel 
District, Gilpin County, Colorado Territory* Mr. Richard Pearce, F.G.9. 
Bismuth, from Doleoath Mine. ..........) 
Bismuthinite, from Hast Pool Mine...... 
Smaltite, GGGO! ee cise sare hsQtomys Si ave 
Wolfram, from Prospidnick Mine, Sithney > Mr. J. H. Collins, F.G.S. 
Pyrites in Chlorite, GhnHKS GocduuGGKC 
Foliated Chlorite, dittomeeeree 5000 
Allophane, from Chariton, Kembipercleiateeictey), 
Kchinus lividus, dredged up off Portloe .... Mr. G. W. Dix. 
Fossils from Slate Rocks adjoining the Copper 
Lode of Knockmahon Mine, County of 
\Wyenieiae, 550b0000000000800050 00000000 Mr. James Webb. 
A Sword, from Taku Forts, Pei ho River.... Mrs. Dix. 
* In relation to this present, Mr. Henwoop said: Many of us recol- 
lect the attempt to establish a Mining School in connexion with this Insti- 
tution, and the admirable manner in which Mr. Pearce instructed his pupils 
in Chemistry. Every one foresaw that, sooner or later, he was certain of 
distinction; and this, I am happy to say, he has attained at a comparatively 
early age. Though no longer a resident in the neighbourhood, he still re- 
members us, and never omits an opportunity of affording us his valuable aid. 
During the past summer Mr. Pearce has been engaged in inspecting valuable 
mines of silver and gold in Colorado, one of the United States of America; 
and whilst there, he recognized amongst the rejected rubbish the ore of 
pitchblende—the Oxide of Uranium. The miners informed him that it 
occasioned them much inconvenience, without any advantage ; and they were 
astonished to learn that it was worth, in this country, some hundreds of 
pounds (I believe Mr. Pearce says £400) per ton. A specimen of this ore, 
presented to us by Mr. Pearce, lies on the table. Pitchblende, though by 
no means an abundant ore in Cornwall, has long been known amongst us; 
the late Mr. Carne mentions it in his description of the mines of St. Just; 
and, from the immediate neighbourhood in which he found it, some little 
quantity has lately been sold. More than twenty years ago, several hundred- 
weight of it were sold from the Providence Mines, near Saint Ives; but it 
realized no more than about £30 per ton. The almost adjoining mine of 
Wheal Trenwith had afforded some quantity of it more than thirty years 
since; and a somewhat remarkable occurrence brought it to light. A parcel 
of copper ore from that mine greatly disappointed the expectations of the 
miners, who thought they hada large proportion of valuable black copper 
ore. The smelter who bought it was disappointed, for the copper he ex- 
tracted from it proved of inferior quality ; and he sent a sample of this 
metal to my kind, esteemed, and excellent friend, the late Mr. John Michell, 
of Calenick, who detected a ‘mixture of uranium. On ascertaining from what 
mine the ore was obtained, and having specimens of the ore sent him for 
inspection, he detected pitchblende in the ore of Wheal Trenwith. This 
incident is recorded in the fiith volume of the Cornwall Geological Tramsac- 
tions. 
