152 
PKOFESSOE KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
69. Sulphate of Soda, Na 2 S0 4 . Crystalline crusts briskly dried. 
Experiments with Naphtha A. Glass 1. Temperature of the Air 11 0, 2-11 0, 4. 
T. 
T. 
t’. 
t. 
M. 
m. 
/• y- 
X. 
sp. H. 
O 
o 
o 
0 
grms. 
grms. 
grm. 
grm. 
44-2 
12-8 
12-52 
9-94 
26-97 
3-465 
1-73 0-431 
0-651 
0-236 
47*8 
13-2 
12-93 
10-14 
26-93 
59 
95 55 
0-224 
46*1 
13-2 
12-93 
10-25 
26-95 
59 
95 99 
„ 
0-230 
46-6 
13-6 
13-32 
10-69 
26-975 
55 
1-716* „ 
Mean 
” 
0-219 
0-227 
Sulphate of Potass , K 2 S0 4 . Crystal crusts sharply dried. 
Experiments with Naphtha A. Glass 2. Temperature of the Air ll°*2-ll 0- 4. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• y- 
X. 
sp. H. 
o 
0 
o 
<3 
grms. 
grms. 
grms. 
grm. 
44-5 
12-7 
12-44 
12-02 
26-915 
3-405 
2-145 0-431 
0-487 
0-187 
47-0 
13-2 
12-93 
10-22 
26-95 
„ 
2-30f „ 
0-200 
45-9 
13-3 
13-02 
10-41 
26-95 
99 
55 95 
„ 
0-200 
43-1 
13-3 
13-03 
10-67 
26-95 
2-275* „ 
Mean 
59 
0-196 
0-196 
Acid Sulphate of Potass, KH S0 4 . Well-formed crystals dried at 100° J. The salt 
became feebly red on the surface in contact with the coal-tar naphtha. 
cperiments with Naphtha A. 
Glass 1. 
Temperature of the Air 17° 
•0-17°- 
T. 
T'. 
t\ 
t. 
M. 
m. 
/• y- 
X. 
sp. H. 
o 
o 
o 
o 
grms. 
grms. 
grm. 
grm. 
50-7 
19-4 
19-12 
16-43 
26-94 
3-445 
1-85 0-431 
0-651 
0-251 
50-4 
19-3 
19-01 
16-36 
26-945 
95 
55 
0-245 
50-5 
19-3 
18-97 
16-34 
26-96 
5? J? 
59 
0-239 
51-9 
19-4 
19-05 
16-32 
26-965 
59 
1-83* „ 
Mean 
55 
0-239 
0-244 
70. Sulphate of Ammonia, N 2 H 8 S0 4 . I made two series of experiments with this salt. 
Crystals dried in vacuo over sulphuric acid. 
I. — Experiments with Naphtha A. Glass 2. Temperature of the Air 10 o, 9-ll o, 3. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y- 
X . 
sp. H. 
o 
o 
o 
0 
grms. 
grms. 
grm. 
grm. 
45-1 
13-0 
12-73 
9-73 
26-93 
3-425 
1-825 
0-431 
0-487 
0-363 
44-5 
13-4 
13-12 
10-25 
26-98 
?? 
59 
59 
99 
0-355 
44-3 
13-2 
12-93 
10-08 
26-93 
1-815* „ 
55 
0-350 
Mean 
0-356 
* After drying the stopper. + After adding some naphtha. 
$ Dr. Engelbach found the quantity of potass in these crystals to be 33'70 and 34-13 per cent. Calculated 
from the above formula 34-61 per cent, are required. 
