452 iMR. GEORGP: W. WALKER ON THE DEPENDENCE OE THE 
As in tlie case of ammonia, the pressure conditions must remain the same 
throughout. 
My first experiments gave a temperature coefficient about -00415; but, after 
having been at a temperature about 90° C., there seemed to have been a considerable 
al)soi'ption of gas, so that I could not obtain the former pressure conditions at lower 
temperatures. I therefore put in new gas and kept a record of the pressures. 
There vras still a gradual absorption of the gas, although not so great as before. 
Whether this was due solely to the walls of the apparatus or to the phosphoric 
pentoxide I am not in a position to say. 
New Sulphur Dioxide, put in 16th August, 1902. 
Date. 
Tempe¬ 
rature of 
tubes. 
Tempe¬ 
rature of 
mano¬ 
meter. 
Ratio. 
Cor¬ 
rected 
ratio. 
Tl +i'2. 
K 
Multijjlied by 
1 (xt 
1-t- -004156 
1+ -004166 
1+ -004176 
i 
18 th Aug. 
° C. 
80-7 
°c. 
21'2 
11-524 
11-550 
137 
10-955 
14-625 
14-635 
14-645 
18 th „ 
81-1 
21-3 
11-507 
11-535 
137 
10-940 
14-620 
14-630 
14-640 
18th „ 
81-2 
21-4 
11-495 
11-520 
137 
10-925 
14-605 
14-615 
14-625 
19th ,, 
37-4 
00 .0 
J-i 
13-278 
13-320 
130 
12-665 
14-630 
14-635 
14-640 
19th „ 
37-,3 
22-4 
13-250 
13-295 
130 
12-640 
14-595 
14-600 
14-605 
19 th ,, 
37-5 
22-5 
13-248 
13-295 
130 
12-640 
14-605 
14-610 
14-615 
19th „ 
15-0 
22 - 7 
14-409 
14-465 
126 
13-775 
14-6.30 
14-635 
14-635 
19th „ 
14-9 
22-7 
14-404 
14-460 
126 
13-770 
14-620 
14-625 
14-625 
20 th „ 
14-15 
20-0 
14-437 
14-485 
121 
13-820 
14-630 
14-635 
14-635 
20 th „ 
14-15 
20-2 
14-442 
14-490 
121 
13-825 
14-635 
14-640 
14-640 
20 th „ 
14-20 
20-4 
14-221 
14-270 
81 
13-825 
14-635 
14-640 
14-640 
Mean . 
14-620 
14-625 
14-630 
Greatest variation 
+ -015 
+ -015 
+ -015 
- -025 
- -025 
- -025 
Die last two ol)servatlons were made in order to obtain the coefficient of increase 
witli ])ressure. 
We have 
(1 + X 121) = 14-490, 
1 -p a?; 
Hence 
K 
1 ^ ,(* +^^80 = 
I at 
1 ~b 
13-825, X = -000398. 
1 he accuracy attained seems much greater than in the case of the former gases; 
but to Ije safe we take the ratio as 
