162 
THE VOYAGE OF H.M.S. CHALLENGER. 
in regard to the absorbed gas as extracted from the water and analysed, and X the total 
of gas (nitrogen + oxygen) absorbed by a unit volume of water at B mm.* dry 
j *r. <suiv and t 0 degrees, reduced to O' C. and B mm. pressure;* and B 2 the corre- 
'p nding values which X assumes when pure oxygen (gas I.), or pure nitrogen (gas 
11.) ar substituted for air, then as the value tt in our apparatus amounted to 1‘6 milli- 
metres, 
. r(B t — t, + 1*6) 
A ~1 + o< 1 )(B 0 -t 0 )x W ’ 
when v stands for the volume of gas as read in the measurer, and W for the volume of 
water used. Whence 
a=0. 
n„ 
in., 
In all the experiments to be reported (where air was used) I took ?% = 0 - 209, m 2 = 0'791. 
Experiments with Pure Water. 
Our first series of experiments was made with air, a flask of W = 800c.c. capacity 
g used in all cases for boiling out the gases. The results were unsatisfactory. Our 
numb, is for X, /3„ /b, were higher than Bunsen’s, and, what was worse, they agreed only 
indifl* renth with one another. What in the following tabular statement are given as 
• nir\ "-values,” were obtained by the ordinary graphic method : — the values of the t 0 were 
laid down as abscissas, the 
observed v 
alues of X or (3 £ 
is ordinates, and the series of dots 
obtained connected together as nearly 
temperatures I found the values given 
as possible by a continuous curve, 
below them — 
For the several 
/ 0 — 4*5* C. 
16* C. 
18“ C. 
18° C. 
35° C. 
n,- 0-3419 
0-3385 
0-3418 
0-3308 
0-3330 
Curve n, — 0'342 
Buiuen >i| — 
0-3386 
0-3380 
•3491 
0-3330 
1000 A- 26-7 
18-9 
190 
19-3 
14-3 
Curve 26 "7 
20-1 
19-2 
19-2 
14-3 
Bunion 22*08 
• 17-71 
17.32 
17-32 
1000/3,-43-7 
30-6 
3115 
30-57 
22-8 
Curve 43-6 
31-9 
30-6 
30-6 
22-8 
linnuen 36*72 
29-49 
28-84 
Not determined. 
1000 ft- 22-2 
15*8 
15-85 
16-34 
12-1 
Curve 22*2 
15-8 
16-25 
12-1 
Bufiarn 18*16 
14-58 
14-26 
Not determined. 
* ¥<>t calculating purpose*, e iy 1 mm., inHtead of B mm. 
