554 
GEOCHEMISTRY: CLARKE AND WHEELER 
In Nos. 1, 2, 3, and 5, very little was found; while the others contained 
quantities ranging from 13 to 61%. Rejecting this variable constitu- 
ent, and recalculating the inorganic portion to 100%, the reduced or 
rational analyses assume the following form: 
1 
2 
3 
4 
5 
6 
7 
8 
SiOz 
0.15 
1.40 
0.00 0. 
13 0. 
11 
1.70 
0.44 
0.15 
(Al,Fe)203 
0.07 
0.57 
0. 
15 0.88 0.05 
1.01 
0.30 
0.03 
MgCOs 
0.35 
12.23 11, 
.56 6. 
18 6.92 
7.71 
8.03 
9.05 
CaCOs 
98.93 
84.61 86.57 90.39 92. 
24 
85.62 
85.11 
88.04 
0.50 
1.19 
1. 
32 1. 
59 0.68 
0.84 
4.69 
2 . 17 
trace 
trace 
0.40 0.83 trace 
3.12 
1 .43 
0.56 
100.00 100.00 100.00 100.00 100.00 
100.00 
100.00 
100.00 
9 
10 
11 
12 
13 
14 
15 
Si02 
18.05 
0.55 
0.22 
0.04 
0.56 
0.11 
0.45 
(Al,Fe)203 
5.80 
0.28 
0.22 
0.24 
0.07 
0.06 
0.15 
MgCOa 
9.21 
13.43 
12.52 
13.29 
12.64 
12.28 
13.79 
CaCOa 
52.23 
79.84 
81.45 
79.48 
84.47 
83.79 
85.61 
CaS04 
1.36 
5.43 
1.95 
4.08 
1.73 
2.93 
trace 
Ca3P208 
13.35 
0.47 
3.64 
2.87 
0.59 
0.83 
trace 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
16 
17 
18 
19 
20 
21 
22 
Si02 
0.21 
0.14 
0.21 
0.24 
0.09 
0.28 
0.34 
(Al,Fe)20, 
0.13 
0.07 
0.28 ' 
0.07 
0.03 
0.21 
0.26 
MgCOs 
15.65 
13.04 
12.64 
13.19 
13.71 
14.13 
15.73 
CaCOs 
81.44 
80.96 
63.38 
80.75 
74.99 
75.36 
72.99 
CaSO^ 
1.69 
3.83 
2.40 
2.95 
2.91 
2.07 
2.11 
CasPzOs 
0.88 
1.96 
1.09 
2.80 
8.27 
7.95 
8.57 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
100.00 
Analysis No. 1, of Heliopora, might be that of an ordinary coral, 
being almost non-magnesian and therefore different from all the others. 
The material of No. 9, Alcyonium, was obviously impure, with much 
admixture of sand and mud. That the species is remarkably rich in 
phosphate, however, seems to be clear; but it needs further investigation 
upon a better sample. In two of the Gorgonias the black, wiry axis was 
separately examined, although there was not enough of it for satis- 
factory analysis. In G. suffruHcosa the axis lost on ignition 94.39%, 
and in G. acerosa 96.35%, mostly organic matter. The inorganic residues 
were small in amount, but partial analysis showed that they differed 
in composition from the more abundant calcareous envelopes. In some 
genera the axes are mainly calcareous; but in others the organic centers 
are very large, and the species are difhcult to deal with analytically. 
Further investigation upon the differences in composition between cortex 
and axis is needed, but on biological rather than geological grounds. 
As the purpose of this investigation is to determine what each group 
