Dr. Pearson's Observations 
424 
14. Copper allayed with £ of its weight of zinc - 8,400 
15. Common brass ingot - 8,300 
16. Common brass, hammered - 8,500 
17. Piece of an old small bell, probably compounded of 
copper with \ its weight tin - 9, 
18. Two different parts of the ingot of gun metal of 
Exp. 12. p. 418 - 8,5 
1 9. Allay of 80 parts of copper with two of tin, and one 
of zinc - 8,560 
20. Allay of 40 parts of copper with one of zinc - 8,450 
si. Allay of 2 parts copper with one of steel - 7, 370 
22. Allay of 3 parts of tin with one of steel - 7,214 
23. Allay of 12 parts of copper with two tin, and one 
of steel ; different parts of the same ingot - 8,534 
8,066 
8,633 
8,720 
24. Allay of 7 parts of copper with two of tin, and one 
of steel ----- 8,633 
25. Allay of 10 parts of copper with one of steel ; two 
different parts - 8,655 
8,600 
§ 7. Conclusions and Remarks. 
1. The first conclusion from the preceding observations and 
experiments is, that the ancient metal instruments examined 
consist principally of copper, as appears ; 1st, from their ex- 
ternal and obvious properties ; particularly their colour, taste, 
malleability, and specific gravity : sdly, from the whole of the 
metals, except a small deposit, yielding nitrate of copper with 
nitric acid: 3dly, from the synthetic experiments. 
