30 Dr. \V. Ramsay on I'icoltne and its Derivatives. 



Cio Hio N 2 . 2HC1 . Pt Cl 4 contains 34*51 per cent, of pla- 

 tinum, and with one molecule of water, 3*07 per cent. H 2 0. 



Isodipyridine methyl-iodide. — When isodipyridine is mixed 

 with excess of methyl iodide, the mixture grows warm, and a 

 brown oil deposits in drops on the side of the tube. After 

 the reaction is over, addition of anhydrous alcohol changes 

 this brown oil into a brilliant red powder. The powder was 

 analyzed. 



Taken 0*2015 gram. 



Ag I 0*1985 gram ) r Q1 , , * . ,. 



A to a aaqk r = 00*14 per cent, or iodine. 



Ag 0*0085 gram J r 



O10 H 10 N 2 . 2 CH 3 1 contains 57*99 per cent, of iodine. 



This red powder is insoluble in absolute alcohol and ether. 

 In aqueous alcohol it dissolves slightly with a yellow colour ; 

 and with water it forms a nearly colourless solution. 



The methyl-chloride is a yellow syrup, which gives a yellow 

 precipitate with platinic chloride, of the formula 



C 10 H 10 N 2 .2CH 3 Cl.PtCl 4 . 



It decomposes partially at 100°. 



Taken 0*3426 gram. 



Pt 0*1126 gram, = 32*86 per cent. 



Calculated for C 10 H^ N, . 2 CH 3 CI . Pt Cl 4 , 32*94 per cent. 

 The small amount of isodipyridine at my disposal made it 

 impossible to prepare more salts. In distilling this base at 

 the atmospheric pressure, the last few drops fell on a red-hot 

 surface; and on opening the bulb a strong smell of pyridine 

 was perceived. This base therefore is apparently- converted 

 into pyridine by exposure to a high temperature. 



The methyl-iodide of dipyridine, prepared from pure 

 crystallized base, is also a red powder ; I failed entirely to 

 observe the white needles described by Dr. Anderson in his 

 account of the base. 



Dijricoline, C 12 H 14 N 2 . — Dipicoline was prepared by Dr. 

 Anderson by allowing picoline to remain in contact with 

 metallic sodium. A bottle, set aside by him in 1874, contained 

 a black, tarry mass ; on exposure to moist air, it gradually 

 became yellow, while the sodium unattached by the picoline 

 oxidized. After the whole had become yellow, water was 

 added, and the oil, which sank to the bottom, was well washed 

 to remove sodium hydrate. After an attempt to purify it by 

 distillation with water-vapour (which did not succeed, owing 

 to the slight volatility of the base), the oil was dried, and dis- 

 tilled alone. A large quantity of picoline came over at 134°; 

 the temperature then rose rapidly to 280°. A small fraction 



