1003 
SiO, 61.3 
Bei 0.7 
Al,O, 20.4 
~ Fe,O 7.6 
MnO trace 
CaO 1.3 
MgO 1.5 
K,O trace 
Na,O 2.5 
H,O 4.3 Eseapes on heating 
99.6 above 110°C. 
In this way we have obtained the following analyses in a com- 
parable form: 
1 | 2 3 4 
SiO, 56.12 | 54.48 | 60.99 | 61.3 
TiO, 2.01') 0.98 3.63')) 0.7 
Al,O3 16.30 | 15.94 | 21.03 | 20.4 
Fe,03 ) 8.66 6.95 1.6 
FeO oaks 0.84 
MnO, 1.62 121 1.24 trace 
CaO 1.65 1.96 (tye 133 
MgO 1.43 deelt 202 1.5 
K,0 1.95 2.85 0.50 trace 
Na,O 3.34 2.05 1.95 2.5 
H‚O after drying at 100° 6.92 7.04 4.72 4.32) 
[100.27 | 9932 | 100— | 986 
1) In the samples 1 and 3 TiO, is determined from a separate 
quantity making the figure for Al,O; too high, because TiO, is 
comprised in it. 
2) Dried at 110°. 
1. Recent red deep-sea clay. Pacific Ocean. Challenger station 256. 30° 22’ N. Lat 
and 154° 56’ W. Long. Depth 5310 m. Anal. Harrison and WILLIAMs. 
2. Average composition of 51 samples of recent deep-sea clay. Anal. G. STEIGER. 
Miocene red deep-sea clay. Mt. Hillaby, Barbados. Anal. J. B. Harrison. 
4. Cretaceous red deep-sea clay. Noil Tobee. Central Timor. Anal. H. TER MEULEN. 
> 
On comparing the analysis 3 of the red clay of Barbados 
with the analysis 4 of the red clay of Noil Tobee, it strikes us that 
