130 PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
grms. of hyalite were used, which therefore contained 3*656 grms. of anhydrous sub- 
stance (m) and 0*139 grm. of water (w). 
Experiments with Naphtha B. Glass 1. Temperature of the Air 17°*8-17°*9. 
T. T'. t'. t. ■< M. m. w. f. y. x. sp. H. 
o o o o grms. grms. grm. grm. grm. a. (i. 
50*4 19*8 19*50 17*26 26*98 3*656 0*139 1*345 0*419 0*651 0*170 0*190 
0*172 0*192 
0*175 0*194 
0*173 0*193 
0*173 0*192 
In another series of experiments 4*475 grms. of hyalite were used, containing 
4*312 grms. anhydrous substance (m) and 0*163 grm. water (w). 
Experiments with Water. Glass 1. 
Temperature of the Air 17° 
*1-17°*2. 
T. 
r. 
t'. 
t. 
M. 
m. 
w. 
/• y- 
X . 
sp. H. 
O 
o 
o 
o 
grms. 
grms. 
grm. 
grm. 
grm. 
a. /3. 
43*5 
18*9 
18*55 
15*41 
26*97 
4*312 
0*163 
1*88 1*000 
0-651 
0*174 0*193 
42*7 
19*1 
18*83 
15*79 
26*99 
55 
55 
55 55 
55 
0*182 0*201 
42*7 
19*2 
18*87 
15*84 
26*955 
55 
„ 
55 55 
55 
0*181 0*201 
42*9 
19*2 
18*94 
15*92 
26*955 
55 
55 
1*865* „ 
Mean . 
55 
0*175 0*195 
0*178 0*197 
The specific heat of amorphous silica must lie between the numbers standing 
under a and (3, and coming nearer those under (3. It does not seem to differ materially 
from that found for crystallized silica. 
49. Molybdic Acid, Mo O s . Greyish-white powder, which, when heated in a porce- 
lain crucible, became permanently bright grey : the results are not trustworthy. 
Experiments with Naphtha A. Glass 3. Temperature of the Air 19°*5-20°*1. 
T. 
T'. 
t'. 
t. 
M. 
m. 
/• 
y • 
X . 
sp. H. 
o 
o 
0 
0 
grms. 
grms. 
grms. 
grm. 
51*4 
20*9 
20*64 
18*44 
26*99 
2*27 
2*65 
0*431 
0*453 
0*155 
51*3 
21*3 
21*04 
18*88 
26*97 
55 
55 
„ 
0*153 
51*5 
21*4 
21*12 
18*94 
26*995 
55 
>5 
55 
55 
0*159 
51*2 
21*4 
21*06 
18*93 
26*96 
55 
2*635 
* 
55 
55 
0*149 
Mean 
. , * 
0*154 
50*8 19*8 19*51 17*23 26*98 
50*4 19*8 19*53 17*27 26*97 
51*4 19*8 19*53 17*21 26*98 
1*33* 
IVfpnn 
After drying the stopper. 
