132 
THE VOYAGE OF H.M.S. CHALLENGER. 
Mean Results of Alkalinity Determinations. 
Per litre. 
Per 55 - 43 grins, 
of Chlorine. 
Alkalinity of all* (130) = 
54-70 
•1520 
15 Surface Waters = 
54-20 
■1492 
6 25 fathoms, = 
53-93 
•1453 
9 50 „ „ 
55-77 
•1551 
1 70 „ „ = 
53-12 
•1464 
1 75 „ „ 
57-12 
•1509 
5 100 „ „ 
52-57 
•1459 
Or 
O 
II 
54-76 
•1461 
6 200 „ „ 
53-52 
•1472 
9 300 „ „ 
55-03 
•1553 
7 400 „ „ = 
53-09 
•1493 
2 500 „ „ 
54-10 
•1472 
2 600 „ „ 
52-92 
•1482 
2 800 „ „ 
53-92 
•1507 
1 1000 „ 
53-20 
•1489 
63 Bottom „ 
5517 
•1540 
Watere in 1873 (40) = 
53-98 
•1498 
„ 1874 (24) = 
55-03 
•1545 
„ 1875 (32) - 
54-57 
•1532 
„ 1876 (32) = 
5313 
•1466 
I last four entries in this table of means owe their origin to a suspicion that the 
">ty of the samples, during the long time of their preservation in glass bottles, 
been perceptibly altered by alkali taken up from the glass. Had this been 
■ t \ v. it- r- collected during 1873 would have been the most strongly alkaline, which 
*' ' “ > D"t the ca-e. The fear seems to be groundless; at least I hope it is so. The 
Excepting tho*c containing depoaiU, &c., enclosed within square brackets. 
