COMPOSITION OF THE RED CLAY 787 
the old analyses range much higher than the new. Possibly for the 
individual analyses, the reddest and therefore the most ferruginous 
samples were chosen for examination, as being presumably the most 
typical. 
TABLE II 
REDUCED ANALYSES 
Composite Analysis Challenger Average 
SIO BNaptoaansscsrrsetenes 54-48 54.28 
MUSK O Fics ela ait tee cr per Bn ete OOO sie h | \me aiaaiaqenerens 
AG Ope coche setsgsaei ver ches 15-94 16.41 
(SiglO Pence ae Bae OrOr2gns . Mail) We te. 
INS Oeos bea b eases oot 8.66 13.58 
IO knee ee om oes 0.84 1.26 
INI@ CoO Riis oscar ONO20Me Wie cs seven cree 
Mn @ascaac scare sreuh 120 1.62 
IMS © eis ere Muecucterave Rioghe 17,0 
CA ONeee Aabase Seisloses 1.96 0.74 
SLOMe eerae epee OOS Ome: RN esi | Coe aererk eae 
Bal @ matnes wou tetncrste ts Cop Xo Wiese aml pants cies 
K,0 eisMolsVictiotetiedelisi or epexeneits 2.85 1.61 
INa'a Oleic tereyeieteueraevoreyas 2.05 Te 37; 
WAOssoebsccnuccuscos ORO3 Gi cay a |eee abate n 
ING Oma saum ecaen eens O,OOLe, [th te sae 
IO Oa etrc ctr car ey sierery eines trace =~ eee 
1201 © Fae Ackareies aires 0.30 0.35 
Cu@iee accor OnO2A ned Alene, | eer. 
PI Ouse reais aie aees OOO SE honing taka, 
TE NO Wises Ri aes OROOS He HI Nsin ts catheters 
HL © ssp ceases utavaceceee aks 7.04 7IeO2 
100.000 I00.00 
On the proximate or mineralogical composition of the red clay, 
I have no important suggestions to offer. That problem was dis- 
cussed at some length, in the ‘‘Challenger” report, on the basis of 
Brazier’s analyses. In those analyses there was discrimination 
between the portion of the clay soluble in strong hydrochloric acid 
and the portion insoluble. In nearly every case the soluble ferric 
oxide was reported in excess of the insoluble; from which I am 
inclined to suspect that the iron of the clay is present, at least par- 
tially, in limonitic or glauconitic combination. The new, com- 
posite analysis shows a quantity of potash which suggests the presence 
of glauconite. The latter compound may well exist in a diffused 
