292 Dr Anderson on the Properties of Picoline. 



Sulphate of Picoline. — I obtained this salt by supersaturat- 

 ing sulphuric acid with picoline. The solution obtained was 

 perfectly colourless, and when evaporated in the water-bath, 

 it evolved picoline in abundance, and formed a thick oily fluid, 

 which, on cooling, concreted into a tough mass of transparent 

 and colourless crystals, apparently of a tabular form. Ex- 

 posed to the air, it deliquesces rapidly into a transparent and 

 colourless oil, which, after a time, acquires a slight brownish 

 colour. It is insoluble in ether, but readily in alcohol, both 

 hot and cold. It is not deposited in crystals by allowing the 

 hot alcoholic solution to cool. I analysed this salt by eva- 

 porating to dryness in the water-bath, in a weighed platinum 

 crucible, and allowing it to cool under an exsiccator. It was 

 then rapidly weighed, dissolved in water, and precipitated 

 by chloride of barium : — 



4-364 grains of sulphate of picoline gave 



5'230 ••• sulphate of baryta=z41-20 per cent, of anhydrous sul- 

 phuric acid. 



This result corresponds with the formula C12 Hy N + 2 H 0, 

 S O3, as is shewn by the following calculation : — 



Experiment. 



. 41-20 



2389-5 100-00 



The sulphate of aniline dried at 212° has a different con- 

 stitution ; it gives 28-67 per cent, of sulphuric acid, which 

 corresponds to the formula C12 II7 N, H 0, S O3. 



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

 acid and picoline in excess, and evaporating the solution over 

 quicklime. 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 abso- 

 lute 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. 



