on some ancient metallic Arms and Utensils . 415 
copper with one of tin resembled the celt metals. No. 1 and 
No. 2, in colour, polished surface, grain of the fracture, and 
brown colour of the fracture : consequently the red colour of 
the copper was completely destroyed. It was not, however, 
so hard, and was stronger than these celt metals ; but was 
harder than the spear and the sauce-pan. 
The solution of this allay with nitric acid only differed 
from that in the former experiment in affording a more 
copious white deposit, namely, ten per cent . of it in its dried 
state. 
Experiment 3. 100 grains of tin were melted with 1200 
grains of copper. This allay of twelve parts of copper by one 
of tin could scarcely be distinguished from the last described 
allay in the colour of the polished surface, nor was it so much 
closer grained or lighter coloured in its fracture as might have 
been expected ; nor could I by the hammer distinguish it from 
that allay in point of hardness and strength. On the trial with 
the drill, it however betrayed a good deal more hardness. It 
was almost as hard as the celts, No. 1 and No. 2. 
With nitric acid it afforded a deposit of eleven per cent, of 
oxide of tin. 
Experiment 4. 100 grains of tin were united by fusion 
with 1000 grains of copper. This allay of copper with one- 
tenth of its weight of tin was as pale coloured as the celts. No. 
1 and No. 2, but not nearly so pale as the celt, No. 3. I could 
not distinguish this allay in the properties of hardness and 
strength from the two celts, No. 1 and No. 2, and the scab- 
bard ; but it was harder than the spear-head and sauce-pan, and 
not so brittle. Its fracture showed the same kind of rather open 
grain, and texture, as that of the celts, No. 1 and No. 2,. be- 
MDCCXCVI. 3H 
