154 TRANSACTIONS OF THE [apR. 21,. 



thick, of beryl ; a flat, sole-like fish, two inches long and one 

 inch wide, made of a material said to be jade ; a circular shaft 

 of rock-crystal, five inches long, with two projecting ends ; two 

 spear-heads, three and four inches long, and some ear-ornaments, 

 all made of transparent rock-crystal. 



Undoubtedly the richest mineral exhibit at the Exposition 

 was that in the Bolivian Pavilion. The famous Huanchaca 

 Company reproduced a gallery of the Pulacayo mine. This 

 gallery, which served as a rear entrance to the building, was 

 twenty feet long and seven-and-a-half feet high, and contained 

 60,000 pounds of ore, valued at 170,000 francs. Bars and in- 

 gots of silver, valued at over 300,000 francs, were exhibited by 

 the company. 



From the mines of Corocoro a magnificent display of crystal- 

 lized native copper, in the form of radiating, arborescent sheets. 



A remarkable exhibit of native bismuth was made by the 

 Aramayo Company, from Tupiza Sanyree y Muerte a Tasna, 

 containing some of the most magnificent specimens of native 

 bismuth probably ever seen ; one of these was a brilliant cleav- 

 age-mass, covered with crystals more than two inches across, and 

 weighing at least four kilos. There were also magnificent masses 

 of carbonate of bismuth — valentinite — in orthorhombic prisms 

 three inches long. 



In the Bolivian Pavilion was also a series of specimens of 

 lapis-lazuli from the Andes, to which were given four distinct 

 names, — i.e., lapis-agatado, lapis-Iazuli, lapis-maclado, lapis- 

 laminosa. Peculiarly interesting, also, were the large masses 

 of talcose slate, filled with hexagonal crystals of aragonite and 

 hexagonal pseudomorphs of native copper, replacing aragonite. 



The Colquechaca Company exhibited a specimen of botryoidal 

 arsenic covered with crystals of proustite, measuring 25x20 

 inches and weighing three hundred and twenty pounds ; also a 

 quantity of smaller specimens with the proustite in fine crystals. 



The Company Itos had a large exhibit of silver minerals and 

 fine specimens of proustite. Portions of wall-rock a foot square 

 were covered with beautiful acicular crystals of jamesonite, 

 matted like mineral wool, and an inch thick. These were as 

 fine as anything ever found. 



An interesting series of silver minerals was exhibited by the 

 famous silver-mines of Potosi, which are situated at an altitude 

 of 14,000 feet above the level of the sea. History tells us that 

 the Spaniards obtained from these mines, about the beginning 

 of the sixteenth century, $2,000,000,000 worth of silver by the 

 sacrifice of the lives of millions of natives, who, when once set at 

 work in the mines, rarely returned to their homes. 



The Chilian Court contained a collection of four hundred 



