CHEMISTEY. 



421 



II. Pioilucts of 12 gallons of ir.as-tar: 



1.10 pounds bcuzem- ( ^^ I.IO pouiitlH uuiliiie) ; ,^ ,. . , 



,,, , , , ^ ' , . .,. / — 0.t)2 pound iiiageuta. 



0.90 pound toluL'ne (^0.77 pound tohudme) S 



1.5 pound.s phenol proper (=1.2 pounds Auriu). 



2.44 ]iounds solvent naphtha (three xylenes). 



2.40 pounds heavy naphtha. 



6.30 pounds naphthalene (=:5.25 pounds a-naphthylamine, 7.11 verinilline 



scarlet RRR, or 1).50 pounds naphthol yellow). 



17.0 pounds creosote. 



14.0 pounds heavy oil. 



0.46 pound anthracene ( = 2.25 alizarine 20 per cent.). 



69.6 pounds pitch. 



III. Dyeing power of colors from 1 ton of Lancashire coal : 



Printers' cloth. 



The distiuguished lecturer illustrated the tiuctorial power of the coal- 

 tar products by exhibitiug a party-colored flag showing the exact 

 amount of color obtainable from 1 pound of Lancashire coal; this flag 

 was made up as follows: 



Inches. 



Magenta tiauuel 8x27 



Violet flannel 24x27 



Yellow flannel 61 x 27 



Orange flannel 1.9x27 



Turkey-red flannel 4 x 27 



The colors chosen are only a few among the numerous list of deriva- 

 tives. This list comprises at present the following: 



16 distinct yellows. \ 



12 oranges. 



30 reds. /Derived from benzene, to 



15 blues. i luene phenols, xylene, 



7 greens. / naphthalene, anthra- 



9 violets. \ cene. 



Several browns. 

 Several blacks. 



The coal-tar antii)yretic medicines next engaged the lecturer's atten- 

 tion. Professor Dewar discovered in 1881 that quinoline belongs to the 



