PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
159 
76. Crystallized Sulphate of Alumina and Potass , Al 2 K 2 S 4 G l6 +24 H 2 G. Transparent 
air-dried crystals of alum. 
Experiments with Naphtha A. Glass 1. Temperature of the Air 17°*2-17°*4. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y- 
07. 
sp. H. 
49*1 
19*5 
19*16 
16*55 
grms. 
26*98 
grms. 
2*87 
grm. 
1*595 
0*431 
grm. 
0*651 
0*362 
49*6 
19*1 
18*83 
16*12 
26*985 
„ 
55 
59 
55 
0*369 
49*0 
19*3 
18*96 
16*32 
26*99 
95 
55 
55 
0*370 
49*5 
19*3 
18*95 
16*23 
26*96 
55 
1*58* 
„ 
55 
0*382 
Mean . . . 0*371 
Crystallized Sulphate of Chrome and Potass , Or 2 K 2 S 4 G l6 +24 H 2 G. Air-dried 
crystals of chrome alum : they remained unchanged in the following experiments. 
Experiments with Naphtha A. 
Glass 3. 
Temperature of the 
Air 17° 
*2-17°*4. 
T. 
T' 
t'. 
t. 
M. 
m. 
/• 
y- 
X. 
sp. H. 
o 
O 
o 
o 
grms. 
grms. 
grm. 
grm. 
50*9 
19*3 
19*03 
16*14 
26*95 
3‘70 
1*875 
0*431 
0*453 
0*325 
50*6 
19*4 
19*06 
16*23 
26*965 
55 
55 
55 
55 
0*320' 
50*9 
19*5 
19*23 
16*34 
26*995 
*5 
55 
59 
95 
0*331 
51*4 
19*6 
19*34 
16*46 
26*97 
55 
1*865* 
55 
55 
0*320 
Mean . . . 0*324 
77. Chloride of Carbon , G 2 Cl 6 . The determination of the specific heat of this, the 
so-called sesquichloride of carbon, has given me much trouble. 
I first investigated, in two series of experiments, a preparation which, after melting 
in a small glass tube, had solidified in porcelain-like white crusts f. 
I. — Experiments with Water. Glass 1. Temperature of the Air 18°*5-18°*8. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y- 
07. 
sp. H. 
53*5 
20*5 
20*22 
16*16 
grms. 
26*94 
grms. 
3*765 
grm. 
1*61 
1*000 
grm. 
0*651 
0*280 
52*2 
20*4 
20*10 
16*18 
26*945 
55 
55 
55 
„ 
0*282 
52*0 
20*7 
20*43 
16*83 
26*97 
55 
59 
55 
55 
0*269 
52*6 
20*8 
20*45 
16*61 
26*965 
55 
1*585* 
0*271 
Mean . . . 0*276 
* After drying the stopper. 
t Sesquichloride of carhon was prepared by continuously passing chlorine into crude chloride of ethylene in 
the sunlight, and washing the solidified product with water ; it was then again treated with chlorine and washed 
with solution of soda and much water. The crystalline mass was afterwards repeatedly pressed between bibu- 
lous paper (by which a small quantity of an oily product was absorbed), dried in the air, then washed with 
cold alcohol, dried, and fused, and the parts which had crept up the sides separated when solid. — Eegelbacu. 
MDCCCLXV. 
Z 
