454 



100-00 

 The simplest formulae of azobenzole and benzidine only differ by 

 one equivalent of hydrogen, — 



Azobenzole C,, H, N 



Benzidine 0,0 HgN, 



a relation which sufficiently explains the transformation and rei)ro- 

 duction of azobenzole. 



" On the Formation and some of the Properties of Cymidine, the 

 Organic Base of the Cymole Series." By the Rev. John Barlow, 

 F.R.S., Sec. R. Inst. 



The object of this memoir is to detail the process by which an 

 organic base, provisionally named Cymidine, was obtained from the 

 hydrocarbon, cymole, and to describe some of its properties, and 

 certain phsenomena attending its production. 



The substitution-product, nitrocymole, was procured b}^ acting on 

 cymole by strong nitric acid, both liquids being kept at the tempera- 

 ture — 17|^°Cent. (0°Fahr.). From nitrocyraol, cymidine was ob- 

 tained by Bechamp's modification of Zinin's process, and results of 

 analyses, made by combustion of the platinum salt, and likewise by 

 a silver determination of the hydrochlorate, were found to coincide 

 with the formula C^^ Hj^ N. In the formation of cymidine a neutral 

 oil occurred, having the same boiling-point with cymole. From this 

 hydrocarbon a substitution compound was derived, apparently iso- 

 meric with, but possessing a less specific gravity than nitrocymole. 

 This nitro-compound was also subjected to the process of reduction 

 already described, and a basic substance was formed from it, which 

 was identified by a platinum determination with cymidine. Some 

 qualitative experiments, made with cymidine, were also described, 

 and the memoir concluded with the following synoptical table of the 

 homologues of the benzole series. 



Hydrocarbons. Nitro-substances. Bases. 



Benzole Cj., Hg Nitrobenzole C]., H, NO^ Aniline Cjg H; N 

 Toluole Ci4 Hg Nitrotoluole C,j H^ NO^ Toluidine C^^ Hg N 

 Xylole CigHio Nitroxylole Cjg H^ NO^ Xylidine Cjg Hu N 

 Cumole Cjg Hj., Nitrocumole Cjg Hjj NO^ Cumidine Cjg Hj.^ N 

 Cymole Cj,, Hj^ Nitrocymole Cjq Hjy NO4 Cymidine C^^, Hu N. 



Letter from Dr. Herapath to Professor Stokes, " On the Com- 

 pounds of Iodine and Strychnine." 



June 20, 1855. 



My dear Sir, — Will you do me the favour to announce to the 

 Royal Society, that I have been engaged, during some months past, 

 in investigating the optical and chemical jiroperties of some crystalline 

 compounds of iodine and strychnine which appear to be strongly 



