Hartley. 
Ph il. Tin ns. 1885 . PI a te 5 5 . 
Tetraeetyl Morphine 
Scode of 'Waives 'Lengths. 
Codeine a) 
Scale of Vlouve Lengths 
N ar eotine . 
Co deine xz) 
Scale of Wave Lengths. 
D iac etyl Co deine 
Scale. o£ 'Wave, lengths. 
Fig. 4. 
Thebaine . 
Scale of Wave Lengths. 
roun. 'in. 2 00 ? 
