220 Dr. Anderson on the Products of the 



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 con- 

 verted into a solid crystalline mass. The crystals are removed 

 from the tube, pressed in folds of filtering paper, and crystallized 

 from a mixture of absolute alcohol and aether. Tbey then form 

 fine silvery plates, highly soluble in water, and slightly deliques- 

 cent ; in alcohol and aether they are also extremely soluble, 

 though less so than in water. With reagents, their behaviour is 

 so exactly the same as that of the aethylopicoliue salts, that it is 

 unnecessary to enter into any details. By analysis the following 

 results were obtained : — 



6-110 grs. of hydriodate of pethylopyridine gave 8*105 grs. 

 carbonic acid and 2*525 grs. water. 



5*445 grs. of hydriodate of pethylopyridine gave 5-395 grs. 



iodide of silver. 



Experiment. Calculation. 



_A_ 



Carbon . . 36-17 35-89 C 14 84 



Hydrogen . 4-59 4-27 H 10 10 



Nitrogen . . 5-70 6-04 N 14 



Iodine . . 53-54 53-80 I 126 



100-00 100-00 234 



The formula of the substance, therefore, is C 14 H 10 N I. 



-ZEthylopyridine itself may be separated from the salt by the 

 action of oxide of silver. It forms a highly alkaline fluid, which 

 undergoes decomposition when heated, with the evolution of a 

 base which is no doubt sethylamine, and agrees completely with 

 it in properties, though the small scale on which the experiment 

 was performed prevented my establishing this fact by analysis. 

 It unites w T ith acids, and forms salts, which are all crystallizable, 

 and generally highly soluble. The platinum and gold salts are 

 extremely beautiful compounds. 



Platinochloride of /Ethylopyridine. — This salt was prepared in 

 the same manner as the corresponding rethylopicoline compound. 

 It is sparingly soluble in cold water, and insoluble in a mixture 

 of alcohol and aether. When slowly formed, it is obtained in 

 beautiful garnet-coloured rhomboidal plates with bevelled edges, 

 which are easily got of a quarter of an inch in diameter, even 

 when operating on very small quantities. Its analysis gave — 



7-152 grs. of pethylopyridine platinum salt gave 6-905 grs. 

 carbonic acid and 1-885 gr. water. 



