294 [ FEBRUARY, 
II. 1.5776 grms. gave: 
0.0090 SPS of Sulphate of baryta and silicic acid, which contained 
0.0086 Sulphate of baryta, and 
0.0004 <  Nilicie acid. 
0.0404 sé “Sulphate of baryta (for SOs). 
0.0645 <¢ ~~ Carbonic acid. 
0.0323 ceo 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 guns: of Pyrophosphate of magnesia (for PO;). 
0.0079 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 SOs). 
0.0023 s¢—s Silicie acid. 
0.0586 ce Carbonic acid. 
0.0116 AW iatele 
0.0470 <¢  ~—s 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. 
I, 2.0083 grms. gave: 
1.1318 ems, of Pyrophosphate of magnesia (for PO,). 
0.0129 Silicic acid. 
0.0582 sc Fluoride of calcium. 
0.0297 «¢ — Pyrophosphate of magnesia (for MgO.) 
1.7829 “¢ Carbonate of lime. 
0.0356 ‘¢ Chlorides of potassium and sodium. 
0.0095 ‘¢ = Platinum =0.0072 chloride of potassium. 
II. 1.1643 grms. gave: 
0.0509 grms. of Sulphate of baryta (for SOs) 
0.0018 os Stlicic acid. 
0.0330 36 Carbonic acid. 
0.0245 ce Water. 
0.0310 “< Organic matter. 
Specimen 4.—Tibia of Archeotherium. 
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. 
J. 2:1037 grms. gave: 
1°0243 ee of Pyrophosphate of magnesia, (for PO;.) 
0:1070 Fluoride of calcium. 
00668 6c Pyrophosphate of magnesia (for MgO.) 
1-7639 66 Carbonate of lime. 
0°0714 &< Chlorides of potassium and sodium. 
0°0122 3% Platinum, = 0-0092 chloride of potassium. 
