32 
MESSRS. C. T. HEYCOCK AND F. H. NEVILLE ON 
Table Ia. —Freezing Points of Alloys formed by adding Copper to Silver. 
Series 1.—348'9 grams Silver. 
(1-) 
Total weight of 
copper present 
(2.) 
Percentage \Yeight 
of copper. 
(3.) 
Atomic 
percentage of 
copper. 
(4.) 
Freezing point on 
the Centigrade 
scale. 
(5.) 
Atomic fall. 
0 
0 
0 
960-0 
i 
1-074 
-31 
•52 
957-2 
5-4 
2-101 
•60 
1-02 
954-3 
5-6 1 
4-195 
1-19 
2-01 
948-7 
5-6 
8-11 
2-27 
3-81 
938-6 
5-61 
13-59 
3-75 
6-23 
925-3 
5-57 
24-03 
6-44 
10-50 
902-4 
5-49 
44*8/ 
11-39 
17-99 
864-9 
5-28 
Senes 
2.—200 grams Silver, 
0 
0 
0 
959-3 
7-305 
3-52 
5-86 
926-1 
5-66 
22-35 
10-05 
16-00 
865.3 
5-88 
32-86 
14-11 
21-88 
847-3 
5-12 
43-57 
17-88 
27-08 
825-3 
4-95 i 
55-67 
21-77 
32-18 
805-0 
4-80 1 
6T74 
23-59 
34-48 
797-0 
4-71 
55 
55 
(778-0) 
67-95 
25-36 
36-67 
788-9 
4-65 
51 
55 
55 
(778-6) 
74-05 
27-02 
38-70 
781-7 
4-59 
55 
5 5 
55 
(778-6) 
78-16 
28-10 
40-00 
778-65 
82-16 
29-12 
41-18 
779-1 
90-34 
31-12 
43-50 
790-3 
55 
55 
55 
(778-6) 
1 
1 
103-02 
34-00 
46-75 
8O5-3 
• 5 
55 
5 
(778-2) 
118-38 
37-19 
50-22 
818-80 
1 
Series 1.—Before adding the last quantity of copper the galvanometer was balanced, 
and it was observed that at the moment after the addition of the copper there was 
no sudden change of temperature. 'The total weight of the metals used in this series 
was 393'8 grams, but the ingot of alloy was found to weigh 379 grams. Although 
some of the alloy adhered to the crucible and to the pyrometer stem, and hence was 
not weighed, yet these numbers point to a probable loss of metal during the course of 
the experiments. Tln^ metal was molten for periods amounting to about five hours 
in all. 
Series 2.—The first two freezing points of the alloy in this series prove, when 
plotted, to be inconsistent with the residts of the other series and with the later 
