cclxxxviii GENERAL SUMMARY OF SCIENTIFIC AND 



Some further comments on the methods of injecting timber 

 with preservative compounds will be found under the de- 

 partment of General Technology. 



It is of importance to record that Coupler's process for 

 producing aniline colors without the employment of arsenic 

 is being largely introduced. It appears that Coupier some 

 time ago succeeded in producing fuchsine by the action, at 

 a suitable temperature, of hydrochloric acid and iron in 

 small quantities on pure aniline and nitrotoluol. Although 

 it was demonstrated that the aniline red obtained by this 

 method was identical with that usually manufactured, and 

 that the yield was greater than where arsenic acid was used, 

 the process was until lately very sparingly introduced on 

 the commercial scale. Recently, however, we learn, the Ge- 

 sellschaft far Anilin Fabrihation of Berlin has erected new 

 works, where no arsenic acid is used in the preparation of 

 colors. Not only fuchsine, but all the colors derived from 

 it, are made, and all are warranted to be free from this poi- 

 sonous agent. The company is producing from 200 to 300 

 kilogs. per diem, and the product is affirmed to be not only 

 purer, but stronger than that made from arsenic acid. Being 

 entirely free from this poisonous substance, these dyes are 

 suitable for a great variety of industrial uses where the 

 others have been found to be dangerous. Upon this subject 

 the Chemical News expresses the hope that, the commercial 

 success of the innovation being demonstrated, other manu- 

 facturers of these dyes will adopt the new method, and re- 

 linquish the old arsenic-acid process, which, apart from the 

 inconveniences it has caused both manufacturers and con- 

 sumers, has led to many lamentable accidents. 



Eosin (from twe, daion) is the name by which a newly in- 

 troduced dye-stuff has been designated. In its solutions and 

 upon silk it is characterized by exhibiting a gorgeous fluo- 

 rescence, in which the beautiful tints of rose and garnet red 

 predominate. It is brought into commerce in the form of a 

 brown red powder, with a greenish, metallic sheen. It is 

 soluble in water and in alcohol. 



Delachanal and Mermet have devised a lamp for photo- 

 graphic purposes which effects the continuous combustion of 

 carbon-disulphide and nitrous oxide. Kiche and Bardy have 

 investigated the photo-chemical intensity of various flames. 



