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XL. A Chemical Investigation of the Organic Bases contained 

 in Coal-Gas Naphtha. By Dr. Augustus William 

 Hofman, Assistant in the Giessen Laboratory. 

 [Continued from p. 205 and concluded.] 

 2. Leucol*. 



(COMPOSITION.— The method for preparing the leucol 

 employed in the determination of its amount of carbon, 

 has already been given. 



Its nitrogen was determined in a gaseous state by burning 

 with oxide of copper, in an atmosphere of carbonic acid. I 

 employed for the latter analysis the basic oil which was ob- 

 tained from the double salt of mercury and leucol. 



Four analyses : — I. 0'3096 grm. of leucol gave 0*9349 grm. 

 of carbonic acid, and 0*1826 grm. of water. 



II. 0*33 grm. of leucol gave 0*9991 grm. of carbonic acid, 

 and 0*186 grm. of water. 



III. 0*4-91-7 grm. of leucol gave 1*4915 grm. of carbonic 

 acid, and 0*2715 grm. of water. 



IV. 0*745 grm. of leucol gave 67 cubic centimetres of ni- 

 trogen. Thermometer 32° Fahr. ; barometer 0*76 metre. 



These analyses give the following per cents. : — 



IV. 



11*275 



which correspond with the formula C 18 H 8 N, as will be at 

 once seen by comparing the mean amount of the numbers 

 found by experiment with the calculated results. 



Per centage composition. 



1 8 atoms of Carbon . 

 8 ... Hydrogen 

 1 ... Nitrogen. 



1642*28 100*000 100*646 



In order to verify the above formula, I prepared the double 

 compound of hydrochlorate of leucol and chloride of platinum. 

 The salt employed for this analysis consisted of different sam- 

 ples, dried at 212° Fahr., at which temperature scarcely any 

 change of weight is observed. 



I. 0*7814 grm. of chloride of platinum and leucol gave 

 0*2287 grm. of platinum = 29*268 per cent. 



* The name leucol (derived from ~Kivx.og and oleum, because it produces 

 no coloured reactions), is not well chosen. I cannot however at present 

 substitute another. 



