6 MOUNTING INSECTS IN FLUID 



cover will settle down into its place by its 

 own weight. 



Subsequently the sides of the cell should be 

 thickly painted with cement along the line of 

 the juncture of the cover with the block, two 

 or three coats being given, and an interval 

 of a day or two left between the application 

 of each coat to allow the cement to harden 

 thoroughly. 



Finally, the cell may be ringed with black 

 varnish, for which purpose a turn-table is 

 required. At the Natural History Museum, 

 instead of varnish, paper covers have been 

 used to hide the unsightly corners, and they 

 seem to answer the purpose admirably. 



