REPORT ON THE COMPOSITION OE OCEAN- WATER. 
119 
during the cruise, by means of his own (the chloride of barium) method. The entries in 
the table are simply transcribed from his journal. I am inclined to think that his results, 
being all obtained by a rigorously constant method, as comparative determinations of the 
loose carbonic acid, are more exact than would appear from the few test experiments made 
in my laboratory. 
Table XIII.* 
Carbonic Acid Determinations executed by Mr. Buchanan on board H.M.S. 
Challenger during the Cruise. 
Number of 
Sample. 
Date of 
Collection. 
Depth 8. 
M grins, of 
COo per Litre. 
1 
Remarks. 
21 
1873 
Feb. 28 
2720 B 
400 
66 
March 26 
3875 B 
57-0 
68 
27 
0 
46-0 
70 
28 
2960 B 
53-0 
72 
29 
2850 B 
52-0 
75 
31 
0 
48-0 
114 
May 
26 
2650 B 
64-0 
The water was slightly turbid with 
117 
27 
1 
45-0 
calcium carbonate. 
When about half distilled over, the 
119 
June 
14 
0 
41-5 
apparatus was stopped up and the 
water squirted out behind. The 
most of the carbonic acid bad 
passed over, probably all. 
120 
14 
2360 B 
47-2 
122 
?> 
16 
2575 B 
500 
136 
23 
0 
52-9 
138 
24 
2175 B 
53-6 
146 
27 
1675 B (!) 
59-2 
149 
)> 
30 
B (?) 
44-6 
209 
Aug. 
16 
0 
43-2 
214 
18 
0 
38-2 
215 
19 
0 
45-5 
216 
55 
20 
0 
43-0 
221 
21 
300 
53-6 
228 
25 
0 
42-6 
231 
55 
26 
50 
53-3 
256 
Sept. 
27 
0 
33 0 
261 
30 
100 
36-0 
Owing to a fault in the new water 
265 
Oct. 
1 
0 
59 T 
bottle, this was probably surface 
water. 
Sample well shaken up with air so as 
267 
2 
0 
41-8 
to saturate it at 22° - 8 C. 
275 
55 
3 
B 
49T 
* With reference to this table see an explanatory note by Mr. J. Y. Buchanan appended to this Report. 
