266 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1907. 
ment undertaken by Ambrosetti. Four specimens of metals from ob- 
jects that were not genuine furnished the following results: 
Copper. Zine. Tin. Lead. 
foe ee ee ee 75.06 12.51 8.02 4,42 
SP ee a er ey Pee ee 73.46 13.88 8.10 4.56 
ee er ee a ee ee ce Eel | 84.11 14.31 12304). 
Ch 2 hs SSIS Soo, Ae SPOS IEE eet a ae a ek ee ea eee ee 82.03 14.56 .70 1.22 
These alloys, very different from those known to the ancient inhabi- 
tants of the country, bring to mind the composition of the brasses and 
inferior bronzes from which are manufactured many objects of mod- 
ern industry. 
