BY J. M. PRTRIE. 143 



given in the following table of only the principal stages in the 

 separation of these salts. 



Fractional Crystal I isat ion of the A urichloridt Salf.s. 

 I 1. Brown viscous deposit, 

 a -' 2. Yellow crystals, ni.p. 135-178\ 

 1^ 3. Amorphous j^ellow mass, 

 'al was washed and found to be non-alkaloidal. 

 a2 was reerj'stallised. 



a3 was decomposed and the alkaloids recovered by shaking out with 

 chloroform. The gold salts were then reformed and crystallised. 

 (a2H-a3) when recrystallised gave (1) yellow crystals, m.p. 174-179'^ 



(2) „ „ 186-162 



(3) „ „ 180-190 



(4) uncrystallisable portion. 



cl when dissolved and recrystallised yielded 1./177-179° 



2. \135 small amt. 



c2 ,, ,, ,, 3. /1 65- 167 greater part. 



4. U35-150 



c3 ,, ,, ,, 5. /1 97- 199 greater part. 



6.\186 



' dl when dissolved and recrystallised yielded (1) 178, 179, 179^ 



d3 ,, ,, ,, (2) 165-166 



d2-f d4 ., „ „ (3) 137, 137 



d5 ,, „ „ (4) 198, 198, 197 



el when dissolved and recrystallised yielded 179, 179, 179" 



e2 „ „ „ 165-166 



e3 „ „ „ 137, 136, 137 



^e4 „ „ „ 197-198 



(5.) IdfntiJicafio7i of the Alkaloids. — The most recent work on 

 the fractional crystallisation of the niidriatic alkaloids is that of 

 Carr and Reynolds (J.C.S., ci., 1912, 950). These authors give 

 the following figures for the melting-points of the salts of the 

 pure alkaloids : — 



Atropine aurichloride ... ... m.p. 137-139'^ 



Lsevo-hyoscyamine aurichloride ... m.p. 165° 

 Nor-hyoscyamine ,, ... m.p. 178- 179° 



Ijjevo-scopolamine ,, ... m.p. 198° 



A portion of the pure aurichloride crystals thus obtained were 

 then converted into picrates, by boiling their solutions with 



