1894.J MICROSCOPICAL JOURNAL 163 



The writer has encountered these obstacles and many 

 more within the past few years in histological and path- 

 ological work and has considered that a collection of 

 some of the more important stains should be made ; a 

 list of these synonyns, their appearance and some of 

 the tests, to determine sophistication. The names and 

 tests are drawn in the main from Beilstein's Handbuch 

 der Organischen Chemie, and the Tabellansche Ubersicht 

 der Kunstlichen Organischen Farbstoffe, von Grustav 

 Schultz und Paul Julius: Zwirte Auflage : Berlin, 1891, 

 upon whose " Alle Rechte vorbehalten," I hope not to 

 have infringed. 



The order of description in tho main is : The name of 

 the preparation which is more commonly used, its 

 synonyms, the appearance of the dye in the rough, solu- 

 bility in water and alcohol and its behaviour with acids. 

 Hydrochloric (HCl), and Sulphuric (H2 SO4 ), and with 

 alkalies, Sodic Hydrate (NaOH). 



ALKALI BLUE. Nicholson Blue. Soluble Blue. Soluble Aniline Blue. 



A light or dark blue powder. 



Difficulty soluVjle in cold ; more readily soluble in warm water. In alco- 

 hol somewhat soluble. HCl to watery solution, blue precipitate. NaOH to 

 watery solution, red brown solution. Concentrated H2 SO4 soon brownish 

 red. Dilution with water, blue. 

 AUEANTIA. Kaiser yellow. 



Keddish brown crystals. 



In water, soluble with orange yellow color. 

 BISMARK BROWN. Manchester Brown. Phenylen Brown. Vesuvin. 



Aniline Brown. Canelle. English Brown. 



Dark brown powder. 



In water soluble with brown color. HCl to watery solution, no change. 

 NaOH to watery solution, brownish precipitate. Hz SOi Cone, brown solu- 

 tion. Dilution with water, red. 



DAHLIA. Hofmann's Violet. Iodine Violet. Primula. Red Violet 5 

 E. extra. Violet 5 R. Violet R. Violet RR. 



Two qualities (a) Reddish and (b) Violet. 



(A). Green crystalline powder. In water soluble with fuchsin red color. 

 HCl to watery solution, yellowish brown color. NaOH to watery solution, 

 brown precipitate. H2 SO4 Cone, yellowish brown solution. Dilution with 

 water, no change. 



(B). Shining green pieces. In water, easily soluble with blue violet color. 

 HCl to watery solution, first green then yellow. NaOH to a watery solution 

 brownish red precipitate. H2 SO4 Cone, brownish yellow solution. Dilu- 

 tion with water, at first olive green, then green, then blue. 





