450 Notices respecting New Books. 



alternative formulae on p. 29 ascribed to Zincke is not due to that 

 author, as will be found on reference to the original paper. 



Oxyquinones, such as the important authraquinone dyestuffs 

 and the quinoneoximes, formerly known as nitrosophenols, form 

 the subject of the third chapter. The author here unreservedly 

 accepts the isonitroso-formula of Groldschniidt. The fourth chapter 

 deals with Ketoneimides and Hydrazides, the sole representative of 

 the former class of compounds being auramine, and the latter 

 class being represented by tartrazine. 



The derivatives ot: Triphenylmeihane form the subject of the 

 fifth chapter, and are dealt with under the three headings of 

 Eosaniline Dyestuffs, Kosolic Acid Dyestuffs, and Phthaleins. 

 Owing to the large number of colouring-matters comprised under 

 this group this is necessarily one of the longest chapters in the 

 book, extending over about 40 pages. The sixth chapter is devoted 

 to the Quinoneimides, viz. Indamines, Indophenols, and Thiamines, 

 the latter comprising the well-known Methylene Blue of Caro. 

 In this same chapter the author iucludes the oxyindamines or 

 oxazines, typified by the first kuown member of the series, Naphthol 

 Blue or Meldola's Blue. In accordance with his own researches 

 Dr. Nietzki also comprises the dichroi'nes or Liebermann's Phenol 

 dyestuffs in this chapter. 



The Azines, treated of: as Eurhodines, Eurhodols, Saffrauines, 

 Magdala red, and Mauvei'ne, constitute the seventh chapter, which 

 is also of considerable length. A short chapter, the eighth, is 

 devoted to Aniliue Black, a subject on which the author is well 

 kuown to be an authority. Chapter IX. treats of Indulines and 

 ISiigrosines ; Chapter X. of the Quinoline and Acridine dyestuffs, 

 and it is of interest to note that the author includes the natural 

 dyestuff berberine in this group, to which it is evidently related, 

 since it gives pyridine-tricarbonic acid on oxidation. Indigo dye- 

 stuffs are discussed at some length iu Chapter XI., aud an excellent 

 summary of Prof, von Baeyer's results is given. In Chapter XII., 

 devoted to Euxanthic Acid and Gralloflavine, we notice the objection- 

 able Teutonism : — " Euxanthic acid contains as chromogen the 

 rest (sic) of diphenyleneketoue-oxide." Cauarine is dealt with in 

 a short page constituting Chapter XIII. , and a similar Chapter 

 (XIV.) suffices for Murexide. The dyestuffs of unknown con- 

 stitution forming the subject of Chapter XV. are Hematoxylin, 

 Haematei'n, Brazilin, Morin, Quercitrin, Archil and Litmus, 

 Cochineal, Catechu, and several other well-known and largely-used 

 vegetable colouring-matters. Any oi these may, with the advance- 

 ment of chemical science, have their constitution explained or even 

 become transferred to the true tar-products before the appearance 

 of the next edition of the work. 



In an industry of such importance, and we may add of such 

 great scientific interest as that of the coal-tar colouring-matters, 

 the value of a work like that forming the subject of the present 



