ON SOME VEGETABLE ALKALOIDS. 45 



fuses and gives off, first water, then acid vapours, and finally, with intumescence 

 and blackening, alkaline fumes of a very nauseous odour, which also affect the 

 throat most unpleasantly. 



Its aqueous solution gives, with that of mercuric chloride, a heavy white pre- 

 cipitate, which is difficultly soluble in boiling water, and is deposited in the cold 

 in very small and separate crystals ; these seem, when magnified, to be prisms and 

 octahedra ; it furnishes, with chloride of gold, an insoluble amorphous yellow pre- 

 cipitate. With bichloride of platinum a pale yellow uncrystalline precipitate is 

 obtained, but this could not, in three trials, be obtained of constant composition ; 

 the platinum came always much too high, even above that of the strychnine salt 

 itself, in two cases, by 0-3 to 07 per cent. 



Bichromate of Amylostrychnine. — This salt was obtained from the mother liquor 

 of salt II. above, by addition of bichromate of potass ; it fell as a crystalline yellow 

 salt, soluble in boiling water; when ignited, it gave the following result : — 



f 6*418 grains, dried at 212°, gave 



\ 0*965 ••■ sesqui oxide of chromium. 



The percentage of anhydrous chromic acid corresponding to this number is 19 63 ; 

 and 19 '37 is that required by a salt, analogous to that of the ethyl base, of the 

 formula — 



C 52 H3 3 N 2 O t Cr0 4 ,HCr0 4 . 



There exists also a crystalline chromate. 



Nitrate of Amylostrychnine. — This was prepared from the crystals of the chlo- 

 ride I., by double decomposition with nitrate of silver in warm liquids. It is more 

 soluble than the corresponding salt of ethylostrychnine ; but it is by no means of 

 great solubility in cold water, though readily taken up in the heat. It crystallizes 

 from hot water in very beautiful radiated groups of colourless needles ; the ana- 

 lysis of these gave the numbers which follow : — 



3*695 grains, 



dried at 212°, gave 







8850 ... 



carbonic acid, and 







2*415 ... 



water. 









Found. 







Calculation. 





65*32 



65*54 



^52 



312 



7*26 





7*14 



H 34 



34 







8*82 



N 3 



42 







18*50 



O n 



88 



Carbon, . 

 Hydrogen, 

 Nitrogen, . 

 Oxygen, . 



100*00 476 



and it appears that this salt is also not anhydrous at 212°, its formula being- 



C 52 H 33 N 2 O, N0 6 + HO. 



