NARRATIVE OF THE CRUISE. 
1041 
No. 10. Three Carcharodon Teeth. 
Station 285 ; 2375 fathoms, South Pacific. 
The largest of these teeth, weighing 22 grins., was taken for analysis. The outer shell 
was readily detached from the inner portion. 
1. The outside portion was found to contain 33'66 per cent, of phosphoric acid, equal 
to 73 '48 per cent, of triCalcic phosphate, and 2 '28 per cent, of fluorine. 
Ratio of equivalents of phosphoric acid and. fluorine — 
1 : 0-1 
2. The inside portion was completely analysed, with the following results : — 
P. 
Silica and portion insoluble in hydrochloric acid, 
13-34 
Moisture, . . . . 
8-41 
Combined water (H 2 0), .... 
6-93 
Manganous oxide (MnO),* 
35-51 
Loose oxygen ( 0 ),* . 
6-85 
Ferric oxide (Fe 2 Q 3 ),* 
12-47 
Alumina (A1 2 0 3 ), . . - . 
5-09 
Lime (CaO), ..... 
3-72 
Magnesia (MgO), . . . 
3-74 
Potash. (K 2 0), ..... 
0-56 
Soda (Ea 2 0), . . . 
1-31 
Phosphoric acid (P 2 0 5 ), .... 
0-83 
Carbonic acid (C0 2 ), 
1-19 
Silica (Si0 2 ) in solution, . . . 
0-30 
Chlorine and copper, . . 
traces 
100-25 
No. 9. Eight Oxyrhina Teeth. 
Station 286 ; 2335 fathoms, South Pacific. 
Colour, brownish black. 
The teeth consisted of a tough outer shell filled up with a friable black mass. 
Three of the teeth were taken, the inside portion separated from the shell, and the 
percentages of phosphoric acid determined, with the following results : — 
Inside. Outside. 
Per cent, of phosphoric acid (P 2 0 5 ), . . . . 7 - 97 32-58 
Equivalent to tricalcic phosphate, . . . . 17 - 39 71 T 2 
* The extra oxygen in the ferric oxide, as the quotients show, is more than sufficient to convert the manganous 
oxide into binoxide. 
