192 



262. THALLIUM PICRATE. T1C 6 H 2 (N0 2 ) 3 0. (CarbazotateofTliallium.) 



t a- Yellow acicular crystals. 



263. SILICATB. TlSi0 2 . 



f a. White powder. 



264. SULPHATE. T1 2 S 4 . (Thallous Sulphate.) 



f a. Small white prismatic crystals. 



Note. These crystals are very similar in appearance to those of 

 strychnia. 



265. SULPHATE WITH ALUMINIUM SULPHATE. T1A1S0 4 , 12H 2 0. 



(Thallium Alum.') 

 t a. Octahedral crystals. 



266. SULPH-ANTIMONIATE. 3 Tig S Sb 2 S 5 . 



f a. Reddish-brown powder. 



267. ANTIMONIO-TARTRATE. 2 Tl Sb, C 4 H 4 7 . (Thallio-tartrate of 



Antimony.) 

 f a. White prismatic crystals. 



Note. These crystals are very similar to those of the sulphate in 

 shape and general appearance, but differ in having numerous minute 

 transverse stris. 



268. BlTARTRATE. T1 2 C 4 H 4 6 . 



f a. Transparent prismatic crystals. 



269. TUNGSTATE. T1 2 W0 4 . 



f a. White powder. 



Note. The above series of specimens of Thallium compounds was 

 presented by Messrs. Hopkin and Williams. For an account of the 

 literature of Thallium, see Journ. Chem. Soc., vol. xvii., pp. 112-152. 



INDIUM. In. 



270. METALLIC. 



f a. Small piece of the metal in sheet. 



GOLD, OR AUEUM. An. 



271. METALLIC. 



t a. Beaten into very thin sheets. (Gold Leaf.) 



272. CHLORIDE, AURIC. An. C1 3 . (Terchloride of Gold.) 



f a. Brownish-yellow crystals. 



273. SODIO-CHLORIDE. Na Cl An C1 3 . 



f a. Orange-yellow crystals. 



274. OXIDE, AURIC. An 2 3 . (Teroxide of Gold.) 



f a. Pale-brown powder. 



Note. This oxide, when freshly prepared, is of a chestnut-brown colour, 

 but becomes partially reduced and of a paler tint by exposure to light. 



