PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
127 
47. Binoxide of Manganese, Mn 0 2 . Pyrolusite from Ilmenau, dried at 100°-110°*. 
Experiments with Naphtha A. Glass 1. Temperature of the Air 14°*4-14 0, 5. 
T. 
T'. 
ti. 
t. 
M. 
m. 
/• 
y- 
X . 
sp. H. 
5T6 
o 
17-0 
16-70 
13-41 
grins. 
26-955 
grms. 
6-32 
grms. 
2-06 
0-431 
grm. 
0-651 
0-162 
48-5 
16-9 
16-63 
13-63 
26-945 
55 
55 
55 
55 
0-161 
45-9 
16-9 
16-61 
13-86 
26-93 
55 
55 
55 
55 
0-161 
44-0 
16-9 
16-64 
14-13 
26-97 
55 
2-04 f 
55 
99 
0-153 
Mean . . . 0T59 
Titanic Acid, Ti G 2 . I have investigated the one quadratic modification, rutile, and 
the rhombic modification Brookite or Arkansite ; I had no material for the investigation 
of anatase, the other quadratic modification. 
Rutile. Fragments of crystals from Saxony and from France. 
Experiments with Naphtha A. Glass 1. Temperature of the Air 13 0, 5-13 0, 7. 
T. 
T'. 
ti. 
t. 
M. 
m. 
/■ 
y- 
X. 
sp. H. 
0 
O 
o 
0 
grms. 
grms. 
grm. 
grm. 
47-9 
16-0 
15-73 
12-63 
26-95 
8-055 
1-60 
0-431 
0-651 
0-159 
47-6 
16-1 
15-78 
12-73 
26-97 
55 
55 
5? 
0-158 
45-2 
15-9 
15-56 
12-73 
26-965 
55 
55 
„ 
,, 
0T56 
45-6 
16-1 
15-84 
13-01 
26-965 
55 
l-58f 
„ 
5? 
0-156 
Mean . . . 0T57 
Brookite or Arkansite. Beautiful small crystals from hotsprings in Arkansas, puri- 
fied by treatment with hydrochloric acid from adherent oxide of iron. 
Experiments with Naphtha A. Glass 1. Temperature of the Air 16°T-16 0, 3. 
T. 
T'. 
ti. 
t. 
M. 
m. 
/• 
y- 
X. 
sp. H. 
O 
o 
o 
o 
grms. 
grms. 
grm. 
grm. 
47-1 
18-2 
17-94 
15-22 
26-97 
8-00 
1-415 
0-431 
0-651 
0-160 
49-3 
18-5 
18-23 
15-22 
26-96 
55 
,, 
5? 
0-161 
49-2 
18-7 
18-40 
15-52 
26-935 
55 
55 
55 
55 
0T60 
49-0 
18-6 
18-31 
15-43 
26-96 
55 
1-395 f 
55 
55 
0-163 
Mean . . . 0T61 
.* This pyrolusite was not pure binoxide, but probably contained some manganite also. In experiments made 
by Mr. Oeseb in the Giessen laboratory, this pyrolusite, dried at 100° to 110°, gave, when heated in a current 
of dry air, the water being collected in a chloride of calcium apparatus, 1-21 per cent, of water ; treated with 
oxalic acid, 'as much carbonic acid was disengaged as corresponded to 95-36 per cent, of binoxide. As the 
specific beat of manganite (0-176) does not very much differ from that found for pyrolusite (0-159), I neglected 
to introduce a correction for the small quantity of manganite. 
t After drying the stopper. 
MDCCCLXV. 
T 
