153 



Note. — The difficulty of rendering this medium free from impurities, and perfectly 

 transparent, has led to the trial of other substances, for the purpose of obviating this 

 inconvenience ; but the result in that respect has not been quite satisfactory. As 

 mounting media, however, the formula? may be useful, and are as follows : — 



No. 1. 



6 oz. White's patent size 



4 oz. honey 



A little spirits and kreosote. (Requires filtering). 



No. 2. 



4 fluid ounces of pure glycerine 

 2 „ distilled water 



1 oz. gelatine 



Dissolve the gelatine in the water ; then add the glycerine, and mix. With care it 

 will do without filtering. 



TRANS. MIC. SOC. VOL. III. 



