REPORT ON THE DEEP-SEA DEPOSITS. 
451 
71. Coral Sand. — S tation 172. 
Lat. 20° 58' S., long. 175° 9' W., 18 fathoms (Renard). 
I. 1'1310 grms. of substance dried at 110° C., treated with hydrochloric acid, gave 0‘016 grm. of phosphoric 
acid, alumina, and iron, 0'5686 grm. of lime, 0'0944 grm. of pyrophosphate of magnesia = 0'0340 grm. 
of magnesia. 
II. 0-852 grm. of substance dried at 105° C. served for the determination of carbonic acid, and gave 0'3602 
grm. 
III. 2-2746 grms. of substance dried at 110° C., treated with dilute hydrochloric acid, gave 0'06346 grm. of 
flocculent residue of organic matter. 
Lime, . . . ■ • • • . . . 50'27 
Magnesia, . . . . . . . . . . 3 ’00 
Carbonic acid, . . . . . . . . . 42‘28 
Alumina, iron, and phosphoric acid, . . . . . .1-42 
Organic substances, . . . . . . . . . 2‘78 
Manganese and alkalies, ........ traces 
99-75 
72. Phosphatic Concretions. — Station 142. 
Lat. 35° 4' S., long. 18° 37' K, 150 fathoms (Klement). 
I. 0'8215 grm. of substance dried at 110° C. gave 0‘0990 grm. of carbonic acid, and 0-0328 grm. of sulphate 
of barium. 
II. 0'5715 grm. of substance dried at 110° C. gave 0-1784 grm. of pyrophosphate of magnesia (P 2 O 5 ), 0'0078 
grm. of silica, 0-2253 grm. of lime, 0-0107 grm. of pyrophosphate of magnesia (MgO), 0-0068 grm. of 
alumina, 0-0145 grm. of peroxide of iron, and 0-0991 grm. of residue insoluble in dilute nitric acid. 
III. 0-2428 grm. of insoluble residue, calcined and fused with the carbonates of soda and potash, gave 0-1880 
grm. of silica, 0-0301 grm. of alumina, 0-0192 grm. of peroxide of iron, 0-0026 grm. of lime, and 0 0069 
grm. of pyrophosphate of magnesia. 
Phosphoric acid, 
Carbonic acid. 
Sulphuric anhydride 
Silica, 
Lime, 
Magnesia, 
Peroxide of iron. 
Alumina, 
Loss on ignition, ^ 
Insoluble residue. 
Composition of the insoluble residue ; — 
Silica, 
Alumina, 
Peroxide of iron. 
Lime, 
Magnesia, 
Ratio of Equivalents. 
0-721 
19-96 
0-422 'V 
12-05 
0-274 lo 
1-37 
O-OI 7 J. 
1-36 
39-41 
0-7041 
0 - 017 / 
0-67 
2-54 
1-19 
17-34 
95-89 
77-43 
12-40 
7-91 
1-07 
1-02 
99-83 
^ An accident during the operation prevented the determination of the loss on ignition. 
