324 
REA GENTS. 
warmed slightly to remove air-bubbles, and a warm 
coverglass applied, care being taken to prevent the 
formation of air-bubbles. Evaporation of the glycerin 
jelly is prevented by the use of shellac cements, asphalt 
varnish or candlewax. 
The following method may be used for the prepara- 
tion of Canada balsam mounts : The specimen is cleared, 
dehydrated by the use of alcohol and then placed in 
chloroform or benzol. The clearing of the specimen 
is materially assisted by placing it in oil of cloves or 
turpentine prior to mounting it. A drop of Canada 
balsam solution (1 part of balsam to 3 parts of chloro- 
form or benzol) is placed on a slide and the specimen 
mounted. When the preparation is nearly dry, scrape 
off the excess of balsam and clean the slide and cover- 
glass with chloroform or benzol, and ring with cement. 
