228 DR T. ANDERSON ON THE PRODUCTS OF THE 



position of ethylopicoline differs from that of tetrethylammonium. According to 

 Hoffman, the latter base is entirely converted into triethylamine and olefiant gas ; 

 but ethylopicoline, even after long-continued boiling, gives an abundant residue 

 on evaporation. The substance so obtained is amorphous, has an intense blood-red 

 colour, and is a base forming a platinum salt insoluble in water. Although these 

 experiments were made on a very small scale, and the slowness of the action 

 rendered it impossible to say with certainty whether the decomposition was com- 

 plete, this platinum compound was analysed, and the results were — 



{5-840 grains of the platinum salt gave 

 8-550 ... carbonic acid, and 

 2-390 ... water. 



J"7'555 grains of the platinum salt gave 

 \ 1-652 ... platinum. 



Carbon, .... 3992 



Hydrogen, . . 4-54 



Platinum, . . . 21-86 



From a single analysis such as this, it is impossible to deduce a formula ; but 

 it is obvious that a base, of much higher atomic weight than ethylopicoline has 

 been produced, the farther examination of which must be deferred to a future 

 paper, and which will probably lead to interesting results. 



Action of Iodide of Ethyl on Pyridine. 



When pyridine is treated with iodide of ethyl, the action, as might be ex- 

 pected, is in all respects similar to that which occurs with picoline. A homo- 

 geneous mixture is first formed, and then, on gently warming, the action takes 

 place, with the evolution of much heat, and the hydriodate of ethylopyridine 

 rises to the surface as an oily layer. The crystallization of this substance, as it 

 cools, is an extremely beautiful phenomenon. Minute rhombs make their ap- 

 pearance here and there in the viscid fluid, where they increase in size so rapidly 

 that they may actually be seen to grow ; and in a successful operation they 

 sometimes increase to the size of from a quarter to three-eighths of an inch in 

 diameter in the course of half an hour. By and by the crystals come into contact 

 with one another, and the fluid is converted into a solid crystalline mass. The 

 crystals are removed from the tube, pressed in folds of filtering paper, and crys- 

 tallized from a mixture of absolute alcohol and ether. They then form fine sil- 

 very plates, highly soluble in water, and slightly deliquescent ; in alcohol and 

 ether they are also extremely soluble, though less so than in water. With re- 

 agents, their behaviour is so exactly the same as that of the ethylopicoline salts, 

 that it is unnecessary to enter into any details. By analysis the following results 

 were obtained : — 



