PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
121 
43. Sulphide of Copper and Iron, Cu Ee -S 2 , or Gu^Ee^S. Crystals and fragments of 
crystalline masses of Copper pyrites from Dillenburg. 
Experiments with Water. 
Glass 1. 
Temperature of the Air 17°-2- 
-17° -5. 
T. 
T '. 
t'. 
t. 
M. 
m. 
/• 
y • 
X. 
sp. H. 
47-5 
o 
19-1 
18-82 
15-22 
grms. 
26-975 
grms. 
7-365 
grm. 
1-825 
1-000 
grm. 
0-651 
0-128 
48-0 
19-4 
19-12 
15-44 
. 26-985 
55 
99 
99 
„ 
0-135 
47-6 
19-5 
19-23 
15-65 
26-975 
59 
„ 
99 
55 
0-131 
48-1 
19-6 
19-25 
15-64 
26-985 
59 
59 
95 
55 
0-128 
47-6 
19-5 
19-23 
15-64 
26-94 
59 
1-81* 
55 
55 
0-133 
Mean . . . 0-131 
Bisulphide of Iron, Ee S 2 . Small crystals and crystalline fragments of Iron pyrites 
from Dillenburg. 
I. — Experiments with Naphtha A. Glass 2. Temperature of the Air 13 0, 3. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• y- 
X. 
sp. H. 
O 
o 
o 
0 
grms. 
grms. 
grm. 
grm. 
47-1 
16-0 
15-66 
12-74 
26-92 
10-11 
1-81 0-431 
0-487 
0-125 
46-2 
15-9 
15-61 
12-77 
26-93 
„ 
55 55 
59 
0-124 
47T 
16-0 
15-74 
12-87 
26-97 
55 
55 55 
„ 
0-121 
47-9 
16-2 
15-87 
12-95 
26-93 
1-795 * „ 
55 
0-121 
Mean . . . 0-123 
II. — Experiments with Water. Glass 3. Temperature of the Air 17°-4-17°'5. 
T. 
T'. 
o 
t'. 
t. 
M. 
grms. 
m.- 
grms. 
/• 
grms. 
y- 
X. 
grm. 
sp. H. 
47-1 
19-7 
19-43 
15-33 
26-97 
10-145 
2-295 
1-000 
0-453 
0-127 
47-5 
19-7 
19-42 
15-23 
26-955 
„ 
„ 
„ 
55 
0-130 
47-6 
19-8 
19-47 
15-33 
26-965 
59 
55 
,, 
55 
0-125 
47-4 
19-8 
19-52 
15-36 
26-945 
55 
2-28* „ 
Mean 
55 
0-131 
0-128 
The average of the means of both these series of experiments, 0*123 and 0-128, 
makes the specific heat of iron pyrites between 18° and 47°=0T26. 
44. Suboxide of Copper, €u 2 0. A crystalline fine-grained Bed copper-glance of con- 
choidal fracture was used for investigation. 
s 2 
* After drying the stopper. 
