1 
452 THE VOYAGE OF H.M.S. CHALLENGER. 
73. Phospiiatic Concretions. — Station 143. 
Lat. 36° 48' S., long. 19° 24' E., 1900 fathoms (Klement). 
I. L1045 grms. of substance dried at 110° C. gave 0T175 grm. of carbonic acid, and 0'0447 grm. of sulphate 
of barium. 
0'4952 grm. of substance dried at 110° C. gave 01822 grm. of pyrophosphate of magnesia (PgOj), 0 0127 
grm. of silica, 0*2028 grm. of lime, 0*01 14 grm. of pyrophosphate of magnesia (MgO), 0'0138 grm. of 
pero.xide of iron, 0*0071 grm. of alumina, and 0*0591 grm. of residue insoluble in dilute nitric acid. 
3*3276 grms. of substance dried at 110° C. gave 0*1213 grm. of loss on ignition. 
0 1892 grm. of insoluble residue, calcined and fused with the carbonates of soda and potash, gave 0*1449 
grm. of silica, 0 0262 grm. of alumina, 0*0150 grm. of peroxide of iron, 0*0024 grm. of lime, 0*0064 
grm. of pyrophosphate of magnesia. 
II. 
III. 
IV. 
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, 
23*54 
10*64 
1*39 
2*56 
40*95 
0*83 
1*43 
2*79 
3*65 
11*93 
99*71 
Ratio of Equivalents. 
0-498-j 
0*242 U*757 
74. Phosphatic Concretions. — Station 143. 
Lat. 36° 48' S., long. 19° 24' E., 1900 fathoms (Brazier). 
0*0171 
0*731 
0*021 
0*752 
76*63 
13*85 
7*93 
1*27 
1*18 
100*81 
Acid -86 *7 4 
Portion insoluble in Hydrochloric i 
Acid -9 *16 / 
Loss on ignition after drying at 230° Fahr., 
4*10 
Copper, 
mere trace 
Alumina, 
3*00 
Ferric oxide. 
5*80 
Calcium phosphate, 
. 49*57 
Manganese oxide. 
2*70 
Nickel, 
Cobalt, 
Calcium sulphate, . 
2*62 
Calcium carbonate, . 
. 16*07 
Magnesium carbonate. 
0*98 
Silica, 
6*00 
Alumina, *k 
Ferric oxide, / 
0*60 
Lime, 
0*16 
Magnesia, 
fair trace 
Silica, 
8*40 
100*00 
mooth on the outside and of a grey colour ; inside colour ligh 
I 
