1864.] Mr. Williams— i?e5e^?rc/ie5 on Isomeric Alkaloids, 311 



bath in which it had been immersed, and plunging it in cold water, the 

 whole solidified at once to a mass of crystals. On analysis, they gave results 

 agreeing with the formula 



Q9 H^^-N, 1. 



II. Lutidine. — A mixture in similar proportions was heated to the same 

 temperature for the same time. On cooling, it showed no signs of crystal- 

 lization. It required an hour's digestion at 100° to effect combination. 

 Even then no crystals were obtained on cooling. In twenty-four hours one- 

 half of the product had crystallized. The rest remained in the form of a 

 syrup. 



Platinum-SaU of Ethyl (^-Lutidine. 



This salt was obtained from the iodide in the usual manner. It crystal- 

 lizes in superb orange-coloured fronds. On analysis it yielded numbers 

 pointing to the formula 



C^H^^N, HCI, PtCP. 



This salt, when boiled, undergoes a totally different decomposition from 

 that afforded by the tertiary monaraines under the same circumstances. The 

 mixture turns black, and deposits the platinum. After two days' boiling, it 

 yielded 27*5 per cent, of metal. The original salt contained 28*99. 



Experiments were also made with the bases and solution of uranium. 

 Tbe results need not be quoted, as they merely confirm the previous ones, 

 and show differences of the same character. 



Compound of (j-Lutidine with Sulphate of Copper. 

 "When /3-lutidine is gradually added to a solution of sulphate of copper, 

 a copious pale green precipitate is formed. It dissolves in excess, forming 

 a rich blue fluid. xA. small quantity of a pale green residue remains undis- 

 solved. The filtered solution soon becomes filled with brilliant blue prisms 

 of considerable size. The air- dried salt retains four equivalents of water. 

 On analysis the results agreed with the formula 



Cu 



C" H«"'N 

 Cu 



Dried at 100° it loses two atoms of water, and at 200° it becomes an- 

 hydrous. 



On the higher Homologues of Chinoline, 

 In his " Researches on Chinoline and its Homologues " *, the author 

 showed that the distillate from cinchonine yielded a base above chinoline, 

 to which he gave the name of lepidine. He also obtained a base of the 

 same formula from coal-tar, which he subsequently showed to be isomeric 

 and not identical with lepidine. He has recently proposed the name of 

 iridolinet for this base. He also obtained from coal-tar a base having the 

 formula C^^ H^^ N, to which he gave the name of cryptidine. 



* Trans. Roy. Soc. Edinb. xxi. part 3. 377. t Chem. Soc. Journ. New Ser. i. 357. 



S0^ + 4H^0. 



