Kneeland.j]_ . 249, [April 16, 
No. 5contains . - . 41.25 Phosphoric Acid. 
1.76 Carbonic Acid. 
—— 
Equivalent to . . 90.07 Phosphate of Lime. 
4.00 Carbonate of Lime. 
No. 6 contains . - 38.76 Phosphoric Acid. 
7.48 Carbonic Acid. 
Equivalent to : . 84.63 Phosphate of Lime. 
17.00 Carbonate of Lime. 
Though having a reddish color, no iron was present. 
A complete analysis of No. 5, gave the following result: — 
Phosphoric Acid (P205) : 41.25 
Carbonie Acid (CO2) . : : 1.76 
Lime (Ca): - tl a ee 
Alumina (Al203) . : 4 5 3.86 
Soda . - : : . trace 
Water and Organic Matter. . 3.68 
100.10 
Magnesia, Potash, and Silica apparently present, but undetermined. 
No. 7 contains . . 29.5 Phosphoric Acid. . 
Equivalent to about . 64.00 Phosphate of Lime; 
the remainder is merely Carbonate of Lime, with a small amount only of 
Sulphate. 
Many of the specimens present a nodular appearance, of various 
sizes, with geode-like prominences and communicating cylindrical 
canals, lined with horn-colored or blush-white incrustations — 
mingled with irregular cavities, more or less narrow and longitudinal, 
with well marked concentric strie of deposition — gradually passing 
into a firm rock by subsequent chemical action. 
From the explanation of Dr. Hayes above given, it might well be 
that this trachytic form should be consolidated under water, by a 
subsidence of the land after it had been deeply covered with organic 
remains; after such mineralization, it may be again raised above the 
surface, and again become the resort of guano-making birds. Guano 
may, therefore, be a geological formation, even of tertiary age, re- 
sembling the massive phosphate of lime (apatite) of New Jersey. 
Dr. Chas. T. Jackson, (Proc. of this Society, Vol. x1, Feb. 19, 
1868), presented two specimens of fossil or submarine guano re- 
ceived from a plantation in the vicinity of Charleston, S. C., showing 
on analysis, 60 per cent. of phosphate of lime, 10 of carbonate of 
