CHEMISTRY. 



421 



1.10 pouuds beuzeue (= 1.10 jxMmds aniliue) 

 0.90 pouud toluene (=0.77 pound toluidiue) 



II. Products of 12 gallons of gas-tar : 



S := 0.<52 pound magenta. 



1.5 pounds phenol proper (^ 1.2 pounds Auriu). 



2.14 Y>ouud8 solvent napbtba (tbree xylenes). 



2.40 pounds heav\' napbtba. 



6.30 i)ouuds napbthalene (^5.25 pounds a-napbtbylanilne, 7.11 venuilllue 



scarlet KRR, or 9.50 pounds napbthol yellow). 

 17.0 pounds creosote. 

 14.0 pounds heavy oil. 



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

 69.6 pounds jiitch. 



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



Printers' cloth. 



The distinguished lecturer illustrated the tiuctorial power of the coal- 

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

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

 was made uj) as follows : 



Inches. 



Magenta flannel 8x27 



Violet flannel 24x27 



Yellow flannel 61 x 27 



Orange flannel 1. 9 x 27 



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 irom benzene, to 



15 blues. I luene phenols, x.>lene, 



7 greens. / naphthalene, anthra- 



9 violets. V cene. 



Several browjis. 

 Several blacks. 



The coal-tar antipyretic medicines next engaged the lecturer's atten- 

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



