Dr Anderson on the Properties of Picoline. 293 



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 as a white crystalline mass, 

 when a mixture of picoline and dilute nitric acid is evapo- 

 rated to dryness at a moderate heat. At a higher tempera- 

 ture it sublimes in white feathery crystals. 



Hydrochlorate of Picoline may be prepared by mixing pico- 

 line and hydrochloric 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 ob- 

 tained by adding picoline to a solution of bichloride of pla- 

 tinum, containing an excess of hydrochloric 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 deposited 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 gene- 

 rally. It requires only about four times its weight of boiling 

 water for solution. 



The crystals of this salt, after washing with alcohol and 

 ether, and drying at 212°, gave the following results of ana- 

 lysis: — 



10'032 grains of chloride of platinum and picoline gave 

 8*862 ... carbonic acid, and 

 2-760 ... water. 



The determination of the platinum, as formerly mentioned, 

 gave in two different trials 32544 and 32522 per cent., the 

 mean of which is 32*533. The analysis corresponds with the 

 formula C^^ Hr N, H CI, Pt 01^. 



VOL. XLI. NO. LXXXII. — OCTOBER 1846. U 



