504 



EXPERIMENTAL PHARMACOLOGY 



Fig. 388. Measuring glass, graduated in ounces. 



Metol Hydrochinon Developer. 



Solution No. 1 : 



Pure water 80 oz. 



Meto] Vs oz. 



Hydrochinon % oz. 



Sodium sulphite, anhydrous 3 oz. 



Solution Xo. 2: 



Pure water SO oz. 



Sodium carbonate, C.P. 2Vi> oz. 

 To develop use : 



Pure water 2 oz. 



No. 1 1 oz. 



No. 2 1 oz. 



The metol must be thoroughly dissolved, then add the 

 hydrochinon and sulphite. 



The plain fixing hath is made as follows : 



Pure water 



Sodium hyposulphite 



16 oz. 

 4 oz. 



Negatives should be left in this bath some little time 

 after the whiteness disappears. This bath must not be 

 used after it is discolored. 



