A NEW ORGANIC BASE FROM COAL-TAR. 131 
This result corresponds with the formula C,,H,N+2H0, $0; as is shewn 
by the following calculation :— 


Theory. Experiment. 
2 Eq. Sulphuric acid é 1000:0 ; 41°84 3 41:20 
1 .--- Picoline ; 4 1164:5 4 48°74 , Aide 
2 ... Water 5 - 225:0 : 9.42 
2389-5 -  100-:00 
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 C,, H, N, HO, 
S 0. 
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 picoline 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 sufficient 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 aniline salt, and 
indeed than the platinum salts of the organic bases generally. It requires only 
about four times its weight of boiling water for solution. 
VOL. XVI. PART II. 21 
