MOUNTING IN DAMMAR AND BENZOL. S^ 1 



when it may be finished with the white zinc varnish and 

 coloured rings as already described. 



Balsam and benzol may be used cold, but as the operation 

 is exactly similar to that of mounting in dammar and 

 benzol it will not be further described. 



The operation of mounting wheat-starch in dammar and 

 benzol will sufficiently explain the cold process of mounting 

 objects in gum resins. Make a mixture of wheat-starch and 

 distilled water, as before advised for potato-starch ; place a 

 drop of this upon the centre of a glass slip, and put in the 

 desiccator (Fig. 238) to thoroughly dry. Now take a drop 

 of benzol and place upon the starch, and before it has time 

 to thoroughly evaporate drop on a little dammar and 

 benzol, put on the glass cover, place the spring clip upon it 

 and set aside for several weeks, when the excess of dammar 

 may be removed and the slide finished as already described. 

 Where many objects are required to be mounted at once, 

 spring clip boards may be used. Many forms have been 

 devised, but that figured in ' Science-Gossip ' for October 



FIG. 246. 



1 88 1 is one to be preferred. It is shown in Fig. 246: A 

 being a base-board of mahogany, C pieces of clock-spring 

 bent at each extremity and fitted into corks at D. At E 

 are four screws which admit of several of these boards being 



