510 



THE DEPTHS OF THE SEA. 



[chap. X. 



Disregarding the above series, a total of 134 experiments were 

 made upon sea- water, which may be thus divided : — 



56 upon surface-water, 



18 „ intermediate water, 



60 „ bottom-water, 



134 



during the first and third cruises. 



The results are given in the quantity of oxygen in fractions 

 of a gramme required to oxidize the organic matter in a litre of 

 water. 



Average of 56 analyses of surface-water: — 



No. 



28. Decomposed . 

 28. Decomposable 



Decomposed . . . 



Decomposable . . 



Total . . . 



0-00025 

 0-00070 



Total 0-00095. 



Maximum. 

 0-00094 

 0-00100 

 0-00194 



Minumim. 

 0-00000 

 0-00000 

 0-00000 



4 cases. 

 1 case. 

 1 case. 



Average of 18 analyses of intermediate water : — 



} Total 0-00039. 



No. 



9. Decomposed . 

 9. Decomposable. 



0-00005 

 0-00034 



In 7 out of 9 there was no " decomposed " organic matter ; 

 and in 3 out of 9 there was no organic matter at all, as indi- 

 cated by this test. 



In this series the analyses of the observations made during 

 the second cruise are not included, as the calculations have 

 been differently made. 



Average of 60 analyses of bottom-water : — 



No. 



26. Decomposed . 



34. Decomposable. 



Decomposed . . 



Decomposable . . 



Total . . 



0-00047 

 0-00041 



Total 0-00088 



Maximum. 

 0-00105 

 0-00148 

 0-00253 



Minimum. 

 0-00000 

 0-00000 

 0-00000 



2 cases. 

 1 case. 

 1 case. 



