188 DR. E. P. PERMAN, &c., ON THE ADIABATIC RELATIONS OE ETHYL OXIDE. 
inferred from a knowledge of temperature and pressure. It was more easy to obtain 
well-defined heaps of silica in the liquid than in the gas. 
The following results were obtained :— 
Pressure. 
Volume of 
I grm. 
W ave- 
lenglli in 
inilliras. 
(Velocity 
in centims. 
per second)”. 
Temperature 100” C. 
4,859 
1-638 
37-67 
43-786 xl0« 
15,8.34 
1-6225 
38-20 
45-026 
28,665 
1-610 
40-43 
50-436 
Temperature 120° ( 
7,496 
1-73.5 
32-42 
32-431 X 10? 
1.5,823 
No data 
33-50 
34-707 
28,644 
35-25 
38-341 
Temperature 150° C. 
13,281 
1-931 
23-33 
16-794 X 10? 
1.5,861 
1-913 
24-53 
18-567 
18,5.50 
1-903 
25-00 
19-285 
21,.59.5 
1-894 
25-47 
20-017 
28,712 
1-870 
27-34 
23-064 
• 
Temperature 175° C. 
19,998 
2-218 
15-27 
7-195x10? 
21,625 
2-208 
15-61 
7-519 
23,565 
2-176 
1664 
8-544 
28,7.53 
2-110 
18-54 
10-606 
Temperature ISo*^ C. 
23,356 
2-490 
10-93 
3-686 X 10? 
24,677 
2-424 
12-52 
4-859 
25,898 
2-376 
13-23 
5-401 
27,250 
2-330 
14-42 
6-416 
28,753 
2-299 
15-19 
7-120 
30,431 
2-262 
15-97 
7-869 
32,313 
2-229 
16-84 
8-7.50 
1 
Pressure. 
i 
Volume of 
1 grm. 
W ave- 
lenjrtli in 
0 
millims. 
(Velocity 
in centims. 
per second)’. 
j 
Temperj 
iture 190° ( 
25,074 
2-730 
8-.35 
2-151x10? 
1 25,867 
2-668 
9-81 
2 969 
1 27,250 
2-546 
11-61 
4-159 
28,753 
2-463 
12-81 
5-063 
,j 30,431 
2-398 
14-04 
6-082 
- 32,313 
2-342 
15-18 
7-110 
; 36,681 
2-256 
17-12 
9-044 
1 
Temj)erature 195° C. 
i 25,898 
* 
7-14 
1 573 X 10' 
' 27,250 
3-285 
7-22 
1-608 
28,753 
2-779 
9-58 
2-832 
; 30,431 
2-601 
11-28 
3-926 
1 32,313 
2-501 
12-79 
5-047 
34,441 
2-426 
14-07 
6-108 
: 36,681 
2-366 
1.5-31 
7-233 
' 39,700 
2-307 
16-50 
8-400 
Temperatui-e 200° C. 
: 30,431 
3-282 
8-20 
2-075 X 10? 
i 32,313 
2-803 
10-28 
3-261 
! 34,441 
2-6.32 
11-90 
4-370 
1 36,681 
2-520 
13-46 
5-590 
39,700 
2-415 
15-00 
6-943 
Temperature 205° C. 
30,398 
6-67 
1-373x10? 
i 33,282 
3-314 
762 
1-792 
34,409 
2-931 
9-84 
2-988 
36,681 
2-721 
11-62 
4-166 
39,658 
2-565 
13-13 
5-319 
Temperature 210° C. 
32,282 
* 
7-10 
1-555 x 10? 
1 34,409 
3-535 
7-88 
1 916 
' 36,681 
3-122 
9-83 
2-981 
39,658 
2-788 
11-57 
4-131 
'IVeating these data as before, the isochoric lines for ^'^jv are found to be straight. 
The investigation was not pushed further, however, as the formulae involved appeared 
to be even more complicated than in the case of the larger volumes; but the above 
experimental data have been given for the sake of anyone who feels interested in the 
subject. 
* Volume not read; curve nearly boi'izontal. 
