300 



PRACTICAL MICROSCOPY. 



may be soaked for a few hours in benzol to remove the 

 excess of turpentine. It is now ready for mounting- 

 Place a very small drop of balsam and benzol upon the 



centre of a glass slip, take 

 up the leg by means of a 

 pair of forceps, and place 

 it upon the drop of balsam ; 

 now put another small 

 drop of the medium upon 

 the object, and taking up 

 the well-cleaned covering 

 glass with the forceps drop 

 it carefully upon the object 

 in a perfectly horizontal 

 manner. Now gently press 

 down the cover with a 

 camel's-hair pencil in such 

 a manner that the object 

 is not disturbed, and put 

 on the spring mounting 

 clip, as shown in Fig. 245. 

 The slide should now be heated over a spirit-lamp until 

 the benzol just commences to boil, when it must be re- 

 moved to a cool spot to 

 thoroughly set. 



The author's practice is, 



FlG 2 - now, to set the slide on one 



side for a few weeks, then to 



clean off the excess of balsam with a scalpel, finally 

 cleansing by slight friction with a piece of cotton wool 

 or sponge moistened with methylated spirit. After another 

 repose for a few days, the slide is placed on the turn- 

 table, and a coating of brown varnish applied, so that the 

 circle embraces the edge of the cover and the slide also, 



FIG. 244. 



