326 
PROFESSOR W. RAMSAY AND DR. S. YOUNG 
Pressure. 
Tempera¬ 
ture. 
Still 
metliod. 
Calculated 
Difference Difference 
A. 
B. 
C and C'. 
Mean. 
from 
in 
in 
PuEGXATJLT. 
formula. 
millims. 
degrees. 
O 
mms. 
mms. 
mms. 
mms. 
mms. 
-20 
. . 
7" 605 
6-27 
-10 
15-5 
15"5 
15-402 
- o-i 
+ 0-1 
13-47 
0 
29-6 
29-6 
29-600 
0 
0 
26-82 
+ 10 
54-7 
, # ■ 
54-7 
54-224 
- 0-48 
+ 0-15 
50-13 
20 
96-0 
96-0 
95-104 
- 0-90 
+ 0-17 
88-67 
30 
160-0 
, , 
160-0 
160-28 
+ 028 
-0-03 
149-99 
40 
260-5 
260-5 
260-47 
- 0-03 
+ 0 
243-51 
50 
406-0 
, , 
406-0 
409-47 
+ 3-47 
-0-2 
3S1-68 , 
60 
625-0 
625-0 
625-10 
- o-io 
+ 0 
579-93 
70 
, , 
. , 
926-60 
, . 
. . 
857-10 
80 
, , 
1,341 
, , 
1,341 
1,340-3 
- 0-7 
+ 0-01 
1238-47 
90 
1,897 
1,897 
1.894-6 
- 2-4 
+ 0-04 
1741-67 
100 
2,627 
2,597 
2,621 
2,622-5 
+ P5 
-0-02 
2405"15 
110 
3,561 
3,561 
3,561-1 
+ o-i 
0 
3259-60 
120 
4,763 
4,705 
4,751 
4,751-3 
+ 0-3 
0 
4341-77 
130 
. . 
6,238 and 6,251 
6,242 
6,239-2 
- 2-8 
+ 0-02 
5691-30 
140 
, , 
8,073 
8,056 
8,071 
8.072-5 
+ 1-5 
-o-oi 
7337 10 
150 
10,305 and 10,359 
10,336 
10,306 
- 30 
+ 0-12 
9361-35 
160 
13,031 
13,011 
13,027 
12,999 
- 28 
+ 009 
170 
, , 
16,292 
16,292 
16,213 
- 79 
+ 0-23 
180 
, , 
20,062 and 20,145 
19,970 
20,089 
20,016 
- 73 
+ 0-18 
190 
24,615 
24,615 
24,481 
-134 
+ 0-28 
# # 
200 
, . 
29,799 
29,739 
29,787 
29,688 
- 99 
+ 0-18 
210 
. . 
35,770 
35,770 
35,722 
- 48 
+ 0-07 
. # 
220 
, , 
42,713 and 42,644 
42,291 
, , 
42,573 
42,676 
+ 103 
-0-14 
225 
, , 
46,334 
46,222 
, . 
46,297 
46,530 
+233 
-0-29 
230 
50,441 
50,262 
50,511 
50,414 
50,651 
+ 237 
-0-28 
. • 
232 
, , 
52,207 
52,192 
52,202 
52,378 
+ 176 
-0-20 
234 
, , 
53,988 
53,890 
, , 
53,939 
54,151 
+ 212 
-0-24 
.. 
236 
55,685 
55,563 
, . 
55,624 
55,971 
+ 347 
-0-38 
237 
. , 
56,955 
. , 
56,955 
56,900 
— 55 
+ 0-06 
238 
57,707 
57,445 
, . 
57,576 
57,839 
+ 263 
-0 29 
. # 
238-5 
58,329 
, , 
58,329 
58,310 
- 19 
+ 0-02 
# , 
239 
58,810 
58,672 
58,741 
58,790 
- 49 
+ 0"05 
239-5 
, , 
59,141 
. , 
59,145 
59,268 
+ 127 
-0-13 
, , 
240 
about 59,660 
59,759 
The number of observations with quantity A was large, and the mean pressure 
given lays due stress on this fact. As with alcohol and ether, the formula expresses 
the observations very closely ; the greatest divergence expressed in temperature being 
only 0'38° at 236°. The constants employed were calculated from observations at 
0°, 55°, 110°, 165°, and 220°. To obtain the best values at these temperatures, 
portions of the curve were smoothed by the method of ratios (see ‘Phil. Mag.,’ 
vol. 20, 1885, p. 516 ct seq.). The constants for the formula given were— 
a = 22-307096, log a = 1-99988416, 
log b = 1-2649587. log /3 = 1-99599796, 
logc = 0-3855770. 
