494 
THE VOYAGE OF H.M.S. CHALLENGER. 
153a. Portion of Recent Earbone, Bal^na Mysticetus (Dittmar). 
Phosphoric acid, 
Carbonic acid, . 
Chlorine 0-088 -(Cl.j-0), 
Sulphuric acid. 
Fluorine,* 
Lime, .... 
Magnesia, 
Potash, 
Soda, .... 
Phosphates of iron and alumina, 
Moisture, 
Organic mattei', 
P. 
E. 
P. 
E. 
31-66 
: 23-67 
= 
1-3377' 
4-77 
: 22 
= 
0-2168 
0-029 
27-5 
= 
0-0011 
0-21 
40 
0-0053 
0-005 
19 
0-0003. 
41-52 
28 
= 
1-4828 'j 
0-86 
20 
= 
0-0430 1 
0-14 
47 
= 
0-0030 [ 
1-46 
31 
= 
0-0470 J 
0-20 
7-31 
11-14 
99-30 
153b. Portion of Recent Mesorostral Bone of 
P artly decayed ; the undecayed portion was analysed. 
ZiPHius, Cape 
OF Good Hope 
P. 
P. 
E. 
Phosphoric acid, ..... 
34-64 
l-4635'j 
Carbonic acid, ...... 
6-35 
0-2886 [ 
Chlorine 0-14 —(C1.J - 0), .... 
0-11 
0-0039 [ 
Sulphuric acid, ..... 
0-05 
0-0125 J 
Fluorine, ...... 
0-032 
Lime, . . . ’. 
40-51 
1-4467' 
Magnesia, ...... 
3-59 
0-1795 . 
Potash, ...... 
trace 
Soda, ...... 
2-13 
0-0687. 
Phosphates of iron and alumina. 
0-36 
Moisture, ...... 
3-51 
Organic matter, ..... 
7-49 
98-77 
•7685 
•1-6949 
From the numbers found for it would appear probable that this bone contains a hydric phosphate such 
L 
as MgllPn^, which I remember liaving seen reported in other bone analyses, but I am more inclined to think 
that there is an unobserved error somewhere. Taking the deficiency (1-7685 - 1-6949) in bases to mean a loss 
of mague.sia, we have for the percentage of that base 3-59 + 1 -47 = 5-06, which would bring up the total 
percentage to 100-21. . 
' H.-iving found by prfdimiimry experiments that the deep-sea specimens contained appreciable quantities of fluorine, I 
devoted particular attention to the exact determination of this element. The method adopted was as follows: — A sufficient 
quantity of ignitinl material (5 to 20 grms.) was heated with a large excess of pure quartz sand and juiro oil of vitriol (previously 
charge<l with sulphate of silver to retain the bulk of the chlorine), and the fluoride of silicon formed, after having been filtered 
through dry asbestos to retain any 8ul[ihuric acid that might have come over, passed into water and determined titrimctrically 
by means of pure standarcl caustic so<ln. In the resulting mixture, the chlorine, if present, was determined and allowed fur. 
