Chemical Science. 383 



slightest touch with a hard body, exhibited a strong metallic lustre, 

 similar to that of yellow copper. Heated with access of air it burnt, 

 producing sulphurous acid and leaving titanic acid. Nitric acid 

 converted it into titanic acid, liberating sulphur. When analyzed by 

 combustion it gave as its elements 



Titanum . . .49.17 

 Sulphur . . . 50.83 



10.000 



and for the elements of titanic acid 



Titanum . . . 66.05 

 Oxygen . . . 33-95 



100.00. 



As a test that the degree of oxidation in titanic acid corresponds 

 with that of the sulphuration in the sulphuret, a portion of the latter 

 was boiled in solution of caustic potash ; the sulphuret was soon de- 

 composed, and titanate of potash was deposited ; and the liquor being 

 acted on by muriatic acid, gave sulphuretted hydrogen without any 

 deposition of sulphur. — Ann. de Chim. xxiii. 353. 



16". Cadmium f rum Zinc Works. — Mr. Herapath formerly stated the 

 presence of cadmium in the zinc works of Bristol, (see vol. xiii. p. 

 427-) He finds that if the powder there referred to be introduced 

 into an iron bottle and tube similar to that used for obtaining oxygen 

 from manganese, a piece of paper pushed down upon it, and the ap- 

 paratus placed above the neck in any furnace or fire-place, where a 

 bright red heat can be produced; the cadmium >vill be found in the 

 cold part of the tube, or resting on the charred paper, if a larger 

 quantity has sublimed than can support itself. It now exists in small 

 globules, and may be obtained in a button, in the way formerly 

 described. It is requisite that paper or some substance be introduced 

 to remove the oxygen of the atmosphere in the bottle. After this 

 process the powder still contains cadmium, which may be separated 

 by solution in muriatic acid, and precipitation by zinc; iron and 

 cadmium precipitate and the mixture distilled as before furnishes more 

 cadmium. 



The sulphuret is proposed as a pigment nearly equalling in beauty 

 the chromate of lead. — Phil. Mag. lxii. 167. 



1 7. Alloy of Zinc and Iron — This alloy was collected by M. Hera- 

 path in a zinc manufactory at Bristol. It lined the tube leading 

 from the retort. It was hard and brittle, the fracture shewing broad 

 facets like zinc, but of a dullergrey colour, with surfaces more rough 

 and granular. Its specific gravity 7. 1 72. It was composed of 92.6 

 zinc, and 7.4 iron per cent. — Phrl. Mag. lxii. 1 68. 



