A NEW ORGANIC BASE FROM COAL-TAR. 131 



This result corresponds with the formula Ci, H; N + 2 H 0, S O3 as is shewn 

 by the following calculation : — 



Theor} . Experiment. 



2Eq. Sulphuric acid . 1000-0 . 41-84 . 41-20 



1 ... Picoline . . 1164-5 . 48-74 



2 ••• Water . . 225-0 . 9.42 



2389-5 10000 



The sulphate of aniline dried at 212° has a different constitution, it gives 

 28-67 per cent, of sulphuric acid, which corresponds to the formula C12 H^ N, H 0, 

 SO3. 



Oxalate of Picoline. — This salt is obtained by mixing oxalic acid and picoline 

 in excess, and evaporating the solution over quick-lime. When the solution is 

 reduced to a very small bulk, it is deposited in the form of short prisms radiating 

 from a centre ; and on further evaporation, the whole concretes into a solid mass. 

 The crystals evolve the odour of picoUne in the air ; they are highly soluble in 

 water and alcohol, both absolute and hydrated. When heated to 212° it fuses and 

 evolves abundance of picoline vapours, and on cooling it forms a thick fluid 

 which slowly deposits crystals in the form of fine needles. These are probably 

 an acid salt. I did not obtain the oxalate in a state of sufllcient purity for 

 analysis. 



Nitrate of Picoline is obtained in a white crystalline mass, when a mixture 

 of picoline and dilute nitric acid is evaporated to dryness at a moderate heat. At 

 a higher temperature it sublimes in white feathery crystals. 



Hydrochlorate of Picoline may be prepared by mixing picoline and hydro- 

 chloric acid, and evaporating on the water-bath. On cooling, the thick fluid 

 which remains consolidates into a mass of prismatic crystals. When heated to a 

 high temperature, it sublimes easily, and deposits itself on the sides of the vessel 

 in transparent crystals, which deliquesce rapidly in the air. 



Chloride of Platinum and Picoline. — This salt is easily obtained by adding 

 picoline to a solution of bichloride of platinum, containing an excess of hydro- 

 chloric acid ; it deposits itself immediately, if the solution be concentrated, but 

 when moderately diluted, it makes its appearance only after the lapse of some 

 time. The crystals which are deposited are rather liable to retain an excess 

 of picoline, which renders it advisable to redissolve them in a dilute solution of 

 chloride of platinum with a little hydrochloric acid. From this solution it is de- 

 posited pure, on cooling, in the form of fine orange-yellow needles, which can 

 easily be obtained half an inch long even when operating on very small quantities. 

 It is much more soluble both in water and alcohol than the anUine salt, and 

 indeed than the platinum salts of the organic bases generally. It requires only 

 about four times its weight of boUing water for solution. 



VOL. XVI. PART II. 2 L 



