





Chemistry and Physics. 107 



In the above process, there was besides formed in the tube, metallic 

 titanium, (in greater quantity as the heat was more intense,) and a mi- 

 nute portion of what appeared to be proto-chlorid. 



By heating pure titanic acid in a current of perfectly dry hydrogen 

 gas, it experiences a loss in weight equal to half an equivalent of oxy- 

 gen, and is converted into Ti 2 3 . This oxyd is slowly rendered 

 white by roasting in the air; it is not attacked by any acid but the sul- 

 phuric, which dissolves it into a violet liquid. The process for the 



analysis of titanic iron by heating it in a current of hydrogen, which 

 depended upon the supposition that titanic acid was not deoxydized by 

 the gas, is consequently inaccurate. 



By dissolving the sesqui-chlorid in sulphuric acid, a violet red solu- 

 tion was obtained, which evaporated in vacuo over lime, gave indistinct 

 crystalline masses of a sesqui-sulphate ; the solution reacts like the 

 sesqui-chlorid. 



The sulphuret found by Rose, by passing the vapor of bisulphuret 

 of carbon over Ti O.,, gave results on analysis approximating to a 

 formula Ti 2 S 3 , (Ti = 314-7 Pierre.) By passing sulphuretted hydro- 

 gen through the perchlorid heated in a retort nearly to boiling, and 

 transmitting the vapors through a tube, heated to faint redness, hydro- 

 chloric acid was evolved and a pure bisulphuret was deposited in soft 

 brass-yellow crystalline scales, with a metallic lustre and resembling 



aurum musivum. By exposure to the air it is slowly decomposed with 

 the evolution of sulphuretted hydrogen. The reaction with sulphuretted 

 hydrogen begins below the boiling point of the chlorid, for the sulphu- 

 r et is in part precipitated as a greenish substance in the bottom of the 

 retort. D T. S. II. 



4. On some Volatile Products resulting from the decomposition of 

 Albumen, Fibrine, Caseine and Gelatine, by oxydiiing agents; by Dr. 

 G- Guckelberger, (Chem. (lazette, March 1st and 15th, 1848, from 

 Liebig's Annalen, Ixiv, p. 39.)— The admirable researches of Schlie- 

 per* on the oxydation of gelatine by chromic acid, led to the hope that 

 }he examination of analogous azotized animal substances would afford 

 important results, and with this view the author has submitted those 

 above named to the action of a mixture of oxyd of manganese and 

 sulphuric acid, as well as to the mixture of bichromate of potash and 

 sulphuric acid. His researches have shown the entire correctness of 

 kchliepers researches, and have moreover afforded many new and im- 

 portant results. 



Caseine with oxyd of manganese and sulphuric acid, has given him 

 acetic aldehyde, rnetacetonic aldehyde, (?) butyric aldehyde, bitter al- 

 mond oil, formic, acetic, rnetacetonic, butyric, valerianic, caproic and 

 oenzoic acids. With chromic acid, the products were rnetacetonic al- 

 dehyde, (?) bitter-almond oil, and formic acid in small quantities; rnet- 

 acetonic, butyric, valerianic, benzoic and prussic acids, besides the vale- 

 r onitril e of Schiieper,t and a heavy oil with the odor of cinnamon. 



The caseine was purified by solution in carbonate of soda and pre- 

 station by sulphuric acid; it was then dried. One part of this was 

 added \o a mixture of 44 parts of concentrated sulphuric acid, with 



Ci 



* This Journal, vol. v, p. 118. t Ibid. 





