CHEMISTRY. 201 



of fatty matter and aftorwartls reduced by hydrogen. The lime 

 remaining in the retort is strongly colored. All the disagreeable 

 odor of the ordinary bisulphide of carbon is removed by this 

 treatment and an ethereal odor only is perceived. — Chem. Netos, 

 Jan., 1869. 



SOLUBILITY OF SULPHUR IN COAL-TAR OILS. 



Coal-tar oils at a low temperature dissolve but a small propor- 

 tion of sulphur ; but at a higher temperature this proportion is 

 considerably increased. Thus coal-tar oil of 0.885 sp. gr. and 

 distilling between 146'° and 200° C. dissolves 



As the temperature decreases the sulphur is precipitated in the 

 crystalline state, and as the diflference in solubility is so great the 

 larger portion of the sulphur dissolved at a high temperature is 

 recovered on cooling the solution. This property of the heavier 

 coal-tar oils is made use of at the Paris gas-works to extract, from 

 the materials which have been used in purifying gas according to 

 Laming's process, the sulphur therein contained. M. Pelouze re- 

 ports very favorably on this plan, as greatly superior to, and less 

 dangerous than, the use of sulphide of carbon for that purpose. — 

 Comptes BenduSfMai/f 1869. 



HiEMATOXYLINE IN PHOTOGRAPHY. 



Dr. Tabensky states that since MM. Erdmann and Hesse had 

 discovered that hoematoxyline reduces solution of silver and be- 

 comes colored red by the action of direct sunlight, he has made some 

 experiments in order to discover whether the alcoholic extract of 

 logwood might not be very serviceable in photography. For this 

 purpose he prepared haimatoxyline in the pure state according to 

 Erdmann's method, taking care to recrystallize the substance re- 

 peatedly from an alcoholic solution. Next two glass plates, 

 properly prepared, were exposed in a photographic apparatus to 

 light, and afterwardsone of these plates was treated as usual with 

 pyrogallic acid, the other with a solution of haematoxyline. The 

 success of the latter operation left nothing to be desired, and 

 further experiments leave little doubt that hoamatoxyline may be 

 advantageously applied in photography. The quantities best 

 suited for the solution are as follows : Htematoxyline, 0.5 

 gi'ams ; distilled water, 80 grams; 22 grams of acetic acid of 33° 

 strength ; and a small quantity of glycerine. — Zeitscli.fu.r Gh. 



