166 APPENDIX. 
A. quantity of the substance was prepared for analysis by elutriating away from. the 
heavier admixtures, washing several times with distilled water, collecting on a filter and 
drying. Treatment with dilute acid is not only unnecessary, since calcium carbonate is 
absent, but harmful, inasmuch as the substance is very sensitive to even dilute acids. It is 
a hydrated silicate, and has the typically zeolitic property of assuming whatever degree of 
hydration brings it into equilibrium with its environment. Hence constant results cannot 
be obtained by drying it either in air or in the oven. Roughly, there are about 18.5 per 
cent of moisture in the air-dried material, and about 7.6 per cent after drying at 110° C. 
Heated to 300° C. it is not completely dehydrated, and reabsorbs moisture on exposure. 
At red heat it turns buff-colored and ceases to be hygroscopic, Even then, however, it 
still retains 1 per cent or so of moisture, the last traces of which are only driven off by 
heating to incipient white heat, when the substance sinters to a light brown, opaque glass. 
The analysis, reduced to terms of anhydrous material, runs as follows : — 
as Phillipsite, 
“alata 2 | QilengerSaton 26 
SiO, 63.40 58.60 
Al,O; 19.82 20.55 
Fe,0; One 7.03 
MnO, 0.52 0.41 
CaO 0.98 2.52 
MgO 3.65 1.39 
K,O 5.14 5.92 
Na,O 8.49 4.98 
100.72 101.40 
Since all deep-sea deposits formed in situ retain a certain ballast of undecomposed rock- 
silicates, these were separated by treating the material with boiling sulphuric acid, fol- 
lowed by dilute alkali, when a residue of 7.1 per cent of rock-silicates was found. This 
contained 69.3 per cent of SiO, and 19.7 per cent of Al,O,, so that it cannot affect the 
bulk analysis seriously. 
The analysis is chiefly remarkable for the high content of alkalies, such as is unknown 
in any secondary deep-sea silicate except palagonite, glauconite, and phillipsite. Alto- 
gether the substance approximates to phillipsite in composition, as is seen by comparison 
with the foregoing mean of three phillipsite analyses from Murray and Renard (Challenger 
Report on Deep-Sea Deposits, page 404). 
Final proof of the zeolitic nature of the substance is afforded by its behavior towards 
dilute acids, to which it readily gives up alkalies and alumina. Even when it was 
attempted to clear the substance of manganese for analysis, by treatment with cold dilute 
acid and So, the figures for the bases were found too low. 
An extraction of a sample containing 18.36 per cent of total water was carried out by 
heating up 2 grams and boiling for ten minutes with 50 ce. of =e hydrochloric acid, the 
process being thrice repeated. The residue was collected and the extract analyzed, with 
the following results : — 
