294 [February, 



II. 1.5776 grms. gave: 



0.0090 grms. of Sulphate of baryta and silicic acid, which contained 



0.0086 " Sulphate of baryta, and 



0.0004 " Silicic acid. 



0.0404 " Sulphate of baryta (for SO3). 



0.0645 ' Carbonic acid. 



0.0323 *< Water. 



0.0896 " Organic matter. 



Specimen 2. Tooth of Titanotherium. 



a. Enamel. Fibrous, with uneven fracture. Very tough. Hardness=4.7. 

 Sp.gr. =3. 03 (at 20'^C.) Lustre, surface vitreous, fibres pearly. Color bluish 

 gray. 



I. 1.6226 grms. gave: 



0.9966 grms. of Pyrophosphate of m.agnesia (for PO5). 



G.0079 " Silicic acid. 



0.0016 " Fluoride of calcium. 



0.0099 " Pyrophosphate of magnesia (for MgO.) 



1.4999 '< Carbonate of lime. 



0.0454 " Chlorides of potassium and sodium. 



0.0081 " Platinum=0. 0061 chloride of potassium. 



II. 1.8518 grms. gave : 



0.0545 grms. of Sulphate of baryta (for SO3). 



0.0023 " Silicic acid. 



0.0586 " Carbonic acid. 



0.0116 " Water. 



0.0470 " Organic matter. 



Specimen 3. Tooth of Titanotherium. 



b. Dentine. Compact. Fracture uneven, somewhat subconchoidal. Hard- 

 ness=2.5. Sp. gr.=2.93 (at 20'=C.) Lustre dull. Opaque. Color white, with 

 gray spots and black streaks. Assumes a greenish tint when heated in presence 

 of air, owing to the formation of manganic acid. 



L 2.0083 grms. gave: 



1.1318 grms. of Pyrophosphate of magnesia (for PO5). 

 Silicic acid. 

 Fluoride of calcium. 

 Pyrophosphate of magnesia (for MgO.) 

 Carbonate of lime. 

 Chlorides of potassium and sodium. 

 Platinum=0.0072 chloride of potassium. 



II. 1.1643 grms. gave : 



0.0509 grms. of Sulphate of baryta (for SO3) 



0.0018 " Silicic acid. 



0.0330 " Carbonic acid. 



0.0245 " Water. 



0.0310 " Organic matter. 



Specimen 4. Tibia of Archoeotherium. 



Compact. Fracture uneven, somewhat splintery. Hardness = 4. Sp. gr. 

 = 2-82 (at 20 C.) Lustre pearly. Opaque. Color, pinkish white. Assumes 

 a greenish tint when heated in the presence of air. The cavities contain crys- 

 tallizations of quartz, and sometimes of sulphate of baryta. 



I. 2-1037 grms. gave : 



1*0243 grms. of Pyrophosphate of magnesia, (for PO5.) 



0*1070 " Fluoride of calcium. 



0*0668 " Pyrophosphate of magnesia (for MgO.) 



1*7639 " Carbonate of lime. 



0*0714 '' Chlorides of potassium and sodium. 



0*0122 ^' Platinum, = 0-0092 chloride of potassium. 



