Dr. Blyth on the Composition of Narcotine. 371 



0-2463 grm. of crystallized cotarnin dried at 100° C. and 

 completely melted lost 0*0185 gim. = 7-51 per cent. 

 0-2522 grm. lost 0-0182 grm. = 7-216 per cent. 



Calculated. Found. 



1 equiv. of anhydrous cotarnin « 28 14-5 , « ^ 



2 equiv. of water .... = 225 7-44 7-51 7-216 

 1 equiv. of crystallized cotarnin = 3039-5 



Hydrochlorate of Cotarnin is formed by dissolving cotarnin 

 in dilute hydrochloric acid. From this solution, by very long 

 evaporation, the salt is obtained in long silky crystals, which 

 are extremely soluble in water. With the bichlorides of mer- 

 cury and gold it forms double salts, the colour of the latter 

 being of a beautiful dai'k red. 



I. 0-3215 grm. of this salt dried at 100° C. lost 0-049 grm. 

 = 15-24 per cent. 



II. 0-4577 grm. lost 0-0664 = 14-51 per cent. 



III. 0-3907 grm. in beautiful crystals dried at 100° C. gave 

 carbonic acid 0*8222 grm., water 0-203. 



IV. 0*271 grm. gave water 0*139 grm. 

 These numbers give the following formula :■ — 



C^sHiaNOfi, HCl + 5Aq. 



Calculated. Found. 

 1 eq. of anhydrous hydroch. of cotarnin = 3269*69 



5 eq. of water = 562-5 14-67 14-51 15-24 



1 eq. ofcrystallized hydroch. of cotarnin =: 3832-19 



I again prepared the platinum double salt directly from the 

 base : this on precipitation is of a pale yellow, but by drying 

 assumes its characteristic dark red colour. 



0*9418 grm. gave 0*2165 grm. of metallic platinum; 

 0-3873 grm. burned with chromate of lead gave carbonic 

 acid 0*4968, water 0-1273. 



These numbers correspond in 100 parts to — 



Calculated. Found. 



Carbon =34*90 34-98 



Hydrogen = 3-24 3-65 



Platinum =22*89 22*98 



Opianic Acid. — This acid having been already examined 



2 B 2 



