50 
THE VOYAGE OF H.M.S. CHALLENGER. 
PAGE 
Summary of principal Test Analyses, ....... 97 
Analyses of a number of Challenger Water Mixtures [Supplementary work, page 239], . 99 
IV. Ox the Carbonic Acid in Ocean- Water, . . . ... . . 103 
Historical and Critical Remarks, ........ 103 
The Norwegian Methods, ........ 106 
The Author’s Method for the Estimation of Carbonic Acid, .... 108 
Synthetical Experiments on Dissociation of Sea- Water Bicarbonates ; and Critical Experi- 
ments on Buchanan’s Method, ....... 108 
Elimination of CO., by mere boiling, . . . . . . .115 
Influence of Sulphates on the Affinity of Water for Carbonic Acid, . . .116 
Table XII. Showing the proportion of total Carbonic Acid found in a selection of 
Challenger Waters , . . . . . .118 
Table XIII. Carbonic Acid Determinations executed by Mr. Buchanan on board II.M.S. 
Challenger during the Cruise , . . . . .119 
V. On the Alkalinity of Ocean- Water, ....... 124 
Table I. Giving the Alkalinity of a selection of Challenger Waters, . . 125 
Table II. Classification of Alkalinities, . . . . . .133 
Table III. Giving the difference between the Alkalinity of Bottom and 11 Surface" 
Waters, . . . . . . . .135 
Table IV. Giving the number of cases in which different values of the Alkalinity 
occur, . . . . . . . .135 
Notes on Anomalous Cases, . . . . . . . .128 
VI. Ox the Absorbed Air in Ocean-Water, ....... 139 
•Jacobsen’s Method of Extracting Gases from Sea- Water, ..... 141 
Method of Gas Analysis, ......... 143 
Table I. Showing the Results of the Analysis of Gases obtained f rom a. Number of 
Samples of Ocean-Water, . . . . . .150 
Table II. A. Surface Waters, . . . . . . .156 
B. Waters from Various Depths , . . . . .158 
C. Bottom Waters, . . . . . . .159 
On the Coefficients of Absorption of Nitrogen and Oxygen, .... 160 
Table III. Giving the values of 100 x n„ ...... 1G6 
Table IV. Giving the values of 1000 x A, . . . . . .167 
Table V. Giving the values of 1000 x /3 V ..... 167 
Table VI. Giving the values of 1000 x /?,, ..... 168 
Final Experiments with Water and Sea- Water, . . . . . .168 
Table VII. Showing the Absorption of Air by Pure Water, .... 172 
Tabl< VIII Showing the Absorption of Oxygen and Nitrogen by Pure Water, . 173 
