446 
THE VOYAGE OF H.M.S. CHALLENGER. 
57. Globioerina Ooze (residue after removal of carbonate of lime by dilute acid). — Station 224. 
Lat. 7° 45' N., long. 144° 20' E., 1850 fathoms (Renard). 
The ooze was first treated in the manner described on pages 220 and 221. 
I. 0 5660 grm. of substance dried at 110° C. served for the direct determination of water, and gave 0'0401 grm. 
of water. 
II. 0-9345 grm. of substance dried at 110° C. gave 0-5995 grm. of silica, 0-1403 grm. of alumina, 0-0765 
grm. of peroxide of iron, 0-0155 grm. of lime, 0-0444 grm. of pyrophosphate of magnesia = 0-0160 grm. 
of magnesia. 
III. 0-8390 grm. of substance dried at 110° C. gave 0 0294 grm. of the chlorides of soda and potash, 0 0483 
grm. of chloroplatinate of potash = 0 00976 grm. of potash and, by difference, 0 0076 grm. of soda. 
Silica, .... 
Alumina, .... 
Peroxide of iron, 
Lime, .... 
Magnesia, .... 
Potash, .... 
Soda, .... 
Water, .... 
Barium, manganese, and phosphoric acid, 
64-16 
15-13 
8-19 
1-66 
1-79 
1-01 
0-90 
7-10 
traces 
99-94 
58. Globigeeina Ooze (determination of organic matter). — Station 224. 
Lat. 7° 45' N., long. 144° 20' E., 1850 fathoms (Hornimg). 
0-9905 grm. of substance, dried at 100° C., lost 0-0537 grm. 
0-9588 ,, ,, ,, 0-0558 ,, 
Mean loss on ignition, 
= 5-42 per cent. 
= 5-82 
= 5-62 
I. 0-4413 grm. of substance dried at 100° C., burnt with oxide of copper, gave 0 0453 grm. of carbonic 
acid = 0 01 235 grm. of carbon. 
II. 0-9012 grm. of substance dried at 100° C., mixed with oxide of copper, and burnt in a current of carbonic 
acid (barometer, 743-95 mm., mean temperature, 22° -5 C.), gave 6-4 cc. of nitrogen = 0-0753 grm. 
Carbon, . . . . . . . . .2-80 per cent. 
Nitrogen, ......... 0-785 ,, 
The proportion of carbon and nitrogen in this organic substance is thus 53-48 : 15. 
59. Globioerina Ooze (residue after removal of carbonate of lime by dilute acid). — Station 338. 
Lat. 21° 15' S., long. 14° 2' W., 1990 fathoms (Klement). 
10185 grma of the ooze dried at 110° C. gave 0-4120 grm. of carbonic acid, corresponding to 0-9364 grm. of 
carbonate of lime = 91-94 per cent. 
A rather largo quantity of the ooze was treated as described on pages 220 and 221. 
I. 0-8360 grm. of substance dried at 110° C., fused with the carbonates of soda and potash, gave 0-4219 
grm. of silica, 0 1 506 grm. of alumina, 0-1066 grm. of peroxide of iron, 0-0220 grm. of dioxide of man- 
ganese, 0 01 43 grm. of lime, 0 0567 grm. of pyrophosphate of magnesia. 
II. 1-1293 grms. of substance dried at 110° C. gave 0-1235 grm. of loss on ignition, and, after treatment with 
hydrofluoric and sulphuric acids, 0 0423 grm. of the chlorides of soda and potash, 0 0647 grm. of chloro- 
platinate of potash. 
