
(ears) 
SUPPLEMENT. 
While engaged with the investigation of codeine, I sent to Professor MILLER, 
of Cambridge, some crystals of the base and its sulphate for crystallographic 
measurement. Owing to Professor Mixter’s other avocations, he was unable to 
furnish me with the results in sufficient time to admit of their being incorporated 
with the foregoing paper. I have, therefore, introduced them here in the shape 
of a supplement, as they form a valuable addition to the observations contained 
in the paper. 
Codeine.—Prismatic. The symbols of the simple forms are, c 001, s 011, 
e101, w 102, m110. The angles between normals to the faces are: 
me 90 0 
Fig. 1. sc 38 37 Fig, 2. 
ss! 77° (14 
ec 39 46 
ed 79 32 
we 22) 35 
uu 45 10 
mm 87 40 
em 63 42 
sm 63 15 
Se 53 3 
Cleavage, c. 

The faces mm’ are usually of very unequal magnitude. The faces ss’ were 
not observed upon the same crystals. The form s is probably hemihedral. 
_ Fig. 1. Codeine crystallised from alcohol. 
Fig. 2. Codeine crystallised from water. 
The agreement of the different observations is not very good, so that the 
above measures must be considered as approximations only. 
Sulphate of Codeine.—Prismatic. Symbols of the simple forms, a 100, ¢ 101, 
m 110. 
The angles between normals to the faces are: 
ea 66 15 
ed 46 30 
ma 75 36 
mm 28 48 
Cleavage, a. 

VOL. XX. PART I. Z 
