﻿6 KNECHT, On some Constituents of Manchester Soot. 



The solvent assumes a deep brown colour, and the extrac- 

 tion is soon complete. After evaporating off the benzene, 

 a greasy, almost black, residue, was obtained, amounting 

 to 13 % by weight of the original soot. It is sticky, and 

 possesses the consistency of butter at the ordinary 

 temperature, but readily softens on warming. When 

 heated, it froths and burns with a smoky flame. For 

 further treatment, the product was gently heated until the 

 frothing had ceased, when it solidified on cooling to a 

 brittle black shining mass. This was then rapidly 

 distilled from a glass retort, and the distillate collected in 

 two portions. The first of these, amounting to 28 grms., 

 formed a clear brown oil, the second, amounting to 6 

 grms., a light reddish coloured very thick fluid, which sets 

 at once on cooling. 



The first distillate, after standing for some time at a 

 low temperature, became semi-solid, owing to the separa- 

 tion of crystals, which were filtered off and purified by re- 

 crystallising several times from boiling absolute alcohol. 

 The substance was thus obtained as a mass of interlaced, 

 beautiful silver-white crystals, which showed a constant 

 melting point of 59'5°. The crystals being soft, their 

 beautiful appearance is spoiled by handling. As the yield 

 only amounted to 0*294 grm., it was not possible to go 

 very deeply into means of identification. The substance 

 dissolved in carbon tetrachloride does not discolourise a 

 dilute solution of bromine in the same solvent. It 

 is slightly soluble in boiling alcohol, but practically 

 insoluble in the cold. Futhermore it appears to resist 

 nitration and sulphonation. The mean of two com- 

 bustions yielded the following figures : — 



C 84-8% 



H i4-i % 



98-9 % 



