1853. | , 293 
acid, and the phosphoric acid precipitated in the ordinary way by sulphate of 
magnesia. 
From the solution containing the soluble nitrates and fluoride of mercury, the 
mercury was precipitated by chloride of ammonium, and the filtrate from the 
calomel precipitated by carbonate of ammonia. As carbonate of lime and 
fluoride of calcium are both slightly soluble in ammoniacal salts, a small quan- 
tity of each was always deposited on evaporation of the filtrate; this was sepa- 
rated by filtration and added to the other portion of carbonate of lime and fluoride 
of calcium. This precipitate was ignited, and an excess of acetic acid added, 
which dissolved the carbonate of lime, leaving the greater portion of the fluoride 
of calcium; but, as fluoride of calcium is soluble to a certain extent in acetic 
acid, the whole was evaporated to dryness to get rid of the free acetic acid, and 
the dry acetate of lime dissolved in boiling water, and filtered from the insoluble 
fluoride of calcium. It being found that it always contained a small quantity of 
silicic acid, the mixture, after being weighed, was treated with hydrochloric 
acid, which left the silicic acid undissolved, the quantity of which was deter- 
mined and subtracted from the previous weight, thus leaving the exact weight 
of the fluoride of calcium. 
The solution from the carbonate of lime containing magnesia and the alkalies, 
was evaporated to dryness to drive off the ammoniacal salts, and the residue 
dissolved in sulphuric acid, the excess of which was also driven off by heat. 
The dry mass was dissolved in water, and acetate of baryta added to convert 
the sulphates into acetates. The filtrate from the insoluble sulphate of baryta 
was then evaporated to dryness in a platinum crucible and heated, in order to 
convert the acetates of baryta, magnesia and the alkalies into carbonates, which 
were treated with boiling water, and the soluble alkaline carbonates thus sepa- 
rated from the insoluble carbonates of magnesia and baryta. This latter mix- 
ture was then treated with diluted sulphuric acid, and the magnesia afterwards 
separated from the filtrate as phosphate of magnesia and ammonia. The car- 
bonates of the alkalies were converted into and weighed as chlorides, and after- 
wards separated by bichloride of platinum. 
A new portion was taken for the remaining determinations. This was dried 
at 220° until the weight became constant, the loss giving the quantity of water. 
The anhydrous substance was then heated in an open crucible until all the or- 
ganic matter was burned off, and then moistened with carbonate of ammonia, as 
it was supposed that the high heat might have expelled a portion of the carbonic 
acid. The difference of weight gave the quantity of organic matter. The car- 
bonic acid was determined in the usual manner from the loss of weight after 
treating with nitric acid. The nitric acid did not dissolve a small quantity of 
silicic acid, the weight of which was ascertained and added to the other portion. 
From the filtrate sulphuric acid was precipitated as sulphate of baryta. 
The following are the characteristics of the specimens and the data of the 
analysis: 
Specimen 1.—Bone of Titanotherium. Compact, with subconchoidal fracture. 
Tough. Hardness=4.5. Sp. gr.=2.87 (at 20°C.) Lustre, resinous. Color, 
brown. Opaque. On heating in a tube gives off ammoniacal water together 
with the odor of burned horn. 
I. 1.9136 grms. gave: 
1.0200 grms. of Pyrophosphate of magnesia, (for PO,). 
0.0018 <¢ —- Silicie acid. 
0.0340 «© ~~: Sesquioxide of iron. 
0.0137 ss —s- Fluoride of calcium. 
0.0175 ‘¢ — Pyrophosphate of magnesia, (for MgQ). 
1.6995 s¢ Carbonate of lime. 
0.0504 <¢ . Chlorides of potassium and sodium. 
0.0127 sc Platinum =0.0096 chloride of potassium. 
