72 On the Action of Chloride of Zinc on Codeia. [Recess, 



drochloric acid. The liquid containing the precipitated hydro-chlorate was 

 allowed to cool, and the precipitate on solidifying was separated from the acid 

 solution. The operation of dissolving and reprecipitating with hydrochloric 

 acid was repeated several times, and lastly the hydrochlorate was dissolved 

 in water, precipitated with carbonate of sodium, and the base extracted 

 with ether. On evaporating the ether-solution the base remained behind 

 as an amorphous, gum-like, reddish mass ; this was powdered, dried in 

 a water-bath, and gave on analysis the following results. All combus- 

 tions were made with oxide of copper and oxygen. 



(I.) 0*3245 gramme of the base, dried at 100° C, gave 0'9150 carbonic 

 acid and 0'2080 water. 



(II.) 0*3150 gramme of the base gave 0*8860 carbonic acid and 0*1960 

 water. 



(III.) 0-4570 gramme of the base, burnt with soda-lime, gave 0*1600 

 metallic platinum. 



Found. 



Calculated. 7l-) (II.) (I1L) 



C 18 216 76*87 76*89 7670 



H 19 9 6*76 7-12 6*91 



N 14 4*98 4*97 



2 32 11*39 



281 100*00 



The reaction that has therefore taken place is similar to that of hydro- 

 chloric acid on morphia, viz. that the chloride of zinc has abstracted the 

 elements of water, thus : — 



Morphia. Apomorphia. 



C 17 H 19 N0 3 = H 2 + C 17 H 17 N0 2 . 



Codeia. Apocodeia. 



C 18 H 21 N0 3 = H 2 + C 18 H 19 N0 2 . 



The base itself is soluble in alcohol, ether, and chloroform, but almost 

 insoluble in water, and has not yet been obtained in the crystalline state. 



The hydrochlorate, obtained by shaking the ether-solution of the pure 

 base with hydrochloric acid, and evaporating the acid solution to dryness, 

 gave the following on analysis : — 



0*563 gramme of the hydrochlorate gave 0*256 chloride of silver. 



Calculated. Found. 



C 18 H 20 NO 2 282 88-82 



CI 35-5 11-18 11-25 



317-5 100*00 



The hydrochlorate cannot be obtained in a crystalline state ; it is easily 

 soluble in water, and is precipitated thence by strong hydrochloric acid. 



On comparing the actions of different reagents on this base with those 

 obtained with apomorphia (Proc. Roy. Soc. No. 112, 1869, p. 459), they 



