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thave described as of concretionary structure especially predominates 
throughout the southern part of Sombrero Island, and over one-half our 
cargoes are composed of it. It contains on an average 83 to, 85 per 
accordi aussure, scratched quartz an specific gravity 
of 3:32-3:40. It was not attacked by acids, and yielded De Saussure 
by fusion a soft glass, having a density of 2°8. younger De Saussure 
“Mr. Damour showed some years since that certain ornamental stones 
from the East, known by the name of jade, had the composition of @ = 
pe lees: and I was led, about four years since, to makean 
entic specimens: 
