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 j 

 0-00070 i 



Total 0*00095. 



Minimum. 



o-ooooo 

 o-ooooo 



o-ooooo 



4 cases. 

 1 case. 



1 case. 



Average of 18 analyses of intermediate water : — 



0-00005 \ 



No. 

 9. Decomposed . 



9. Decomposable. 



0-00034 



Total 0-00039. 



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 : — 



