1040 
THE VOYAGE OF H.M.S. CHALLENGER. 
No. 6. Portion of a Whale’s Bone much impregnated with Manganese. 
Station 286 ; 2335 fathoms, South Pacific. 
The manganese was pretty well diffused all through the specimen. 
Found in 100 parts— 
Moisture, . . . . . . . . .5-49 
Combined water (H 2 0), . . . - . . . 6 ’88 
Phosphoric acid (P 2 0 5 ),* . . . . . . . 13 '05 
Fluorine (F 2 ), ......... 0’65 
Ratio of equivalents of phosphoric acid and fluorine — 
1 : 0-062 
No. 7. Portion of Earb one ( Ziphius ). 
Station 289; 2550 fathoms, South Pacific. 
This specimen resembled Nos. 2 and 3, but was smaller, and the cavity, which in 
them was filled up with a brownish friable mass, contained in this case a hard black sub- 
stance. The inner portion was brownish ; it consisted of hard vitreous looking matter 
with a yellowish soft powder diffused through it. 
Found in 100 parts of the inner portion — 
Moisture, . . . . . . . . . 1 - 61 
Phosphoric acid (P 2 0 5 ),f . . . . . ' . 32 ‘73 
Fluorine (F 2 ), . . . . . . . . L61 
Ratio of equivalents of phosphoric acid and fluorine — 
1 : 0-061 
No. 2. Portion of Earbone of Balcenoptera. 
Station 286 ; 2335 fathoms, South Pacific. 
This specimen was very similar to No. 3, having a cavity with a brown incrustation, 
a black outer coating, and the inside being almost uncoloured by iron or manganese. 
Found in 100 parts of the inner portion — 
Moisture, 
Combined water (H 2 0), . 
Phosphoric acid (P 2 0 5 ),f . 
Fluorine (F 2 ), 
1-6 
1-34 
31-21 
1-89 
Ratio of equivalents of phosphoric acid and fluorine — 
1 : 0-0753. 
* Equal to 28-48 per cent, tricalcic phosphate. t Equal to 71 '44 per cent, tricalcic phosphate. 
X Equal to 68-13 per cent, tricalcic phosphate. 
