1853.1 29 



o 



acid, and the phosphoric acid precipitated in the ordinary way hy 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 calciuna. 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 maght 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.o. 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. 



1. 1.9136 grms. gave : 



1.0200 grms. of Pyrophosphate of magnesia, (for PO3). 



0.0018 " Silicic acid. 



0.0340 " Sesquioxide of iron. 



0.0137 Fluoride of calcium. 



0.0175 " Pyrophosphate of magnesia, (for MgO). 



1.6995 " Carbonate of lime. 



,0504 " Chlorides of potassium and sodium. 



0.0127 *' PIatinum=0.0096<:hloride of potassium. 



