r,o 
MESSRS. 0. T. HEYCOCK ARD F. H. NEVILLE ON 
Fig. 8. 
^ o 
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^-7. 
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3. 
p 
0 
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\ y 
In degrees Centigrade and atomic percentages. 
lead curve. Silver-lead and silver-tin do not probably, in our experiments, separate 
into conjugate liquids, but if they could be examined at a somewhat lower tempera¬ 
ture, they perhaps would do so. These curves may be compared with the vapour- 
pressure curve of a mixture of water and propyl alcohol, a system which stands at 
the dividing line between wholly and partially miscible liquids. The portion of the 
silver-lead curve given as a dotted line is hypothetical, as no freezing point could be 
detected in this region. 
The Lead-Co'p'per Curve. (Fig. 9.) 
For the first seven atoms at least of lead this curve agrees well with the ideal 
curve of equation (2), but as more lead is added the curve rapidly appi’oaches the 
horizontal, until at 17 atoms of lead the addition of this metal ceases to affect the 
freezing point. From this point until 65 atoms of lead the curve is a horizontal 
