On some ancient metallic Arms and Utensils. 417 
more brittle than the celt. No. 3, and of course much more so 
than the other ancient metals. 
This allay, on solution in nitric acid, yielded twenty per 
cent, of oxide of tin. 
Experiment 8. 100 grains of tin were melted with 600 
grains of copper. This allay of six parts of copper with one 
of tin was harder than any of the above allays : and perhaps 
it was harder and more brittle than any of the ancient metals. 
Its fracture exhibited a still finer, brighter, silvery, and more 
crystallized grain than any of the preceding allays. 
Nitric acid separated from this allay twenty-two per cent . of 
oxide of tin. 
Experiment 9. 100 grains of tin were melted with 400 
grains of copper. This allay of four parts of copper with one 
of tin was about as hard and brittle as some sorts of bell- 
metal. Its fracture was still paler, finer grained, and silvery, 
than any of the preceding allays. 
Nitric acid separated from this allay twenty-seven per cent. 
of oxide of tin. 
Experiment 10. 100 grains of tin were melted with 300 
grains of copper. This allay of three parts of copper with 
one of tin, was much harder than any of the preceding ones. 
It was also much more brittle, the fractured surface was quite 
smooth, and without almost any grain at all. It was of a sil- 
very hue, and resembled much an ingot of a melted bell ; ex- 
cepting that it was finer grained, and of a duller colour. 
Experiment 11. 100 grains of tin were melted with 200 
grains of copper. This allay of two parts of copper with one 
of tin, was as brittle almost as glass. The fracture showed no 
3H 2 
