356 C. U. Shepard, Jr., on the composition of the 
represent the exact composition of the formation from each 
neighborhood, since a material difference is often remarked in 
nodules from the same pit; but these analyses have been chosen 
lower than those obtained by other methods; but as yet I have 
found no reason to doubt their accuracy, The organie matter 
amounts to about one-third to two-thirds of the percentage put 
own to water of combination and organic matter. Some nod- 
ules contain nitrogenous matter sufficient to yield on decompo- 
sition with soda lime over 3 per cent of ammonia, (In one ope: 
cimen 0°26 per cent ammonia was determined), The magnesia 
rarely exceeds one half per cent, 
Analysis No.1, from the Cooper river. 
it oO. 2 “ 
: No. 2, near Goose creek. 
e No. 3, "> the Ashley river. 
“a No.4, Stono « 
a ONG, 62 © le, 
oo NOt, * . « Ashepoo “ 
dy No.7,“ © Ashopoo 
Sn a Oe Helena Sound. 
Recs Bes ks hones ee 
Specific rrayi 244 2 54 249 27 
Moiskting GA teh 0), e 194 319 238 ‘ “y * O87 
Water of combination 
and organic matter,ex- 458 6:03 (915 +15 +} 73 go, +803 aug 
fe Si 2S ee” os bd oe 8a 
ed ae, Ss eee ees Oey ee 
Phosphoric acid, 2528 2611 2605 27-24 30-17 2984 2755 289, 
rae 35-71 
Peroxyd of iron, alumina 
; 5-92 1501 56 76 6 ee fate 
: 15% 12-13 2 = S 
= oh Satie cae 1167 11-27 15-0 105 
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