PRESERVING 193 



evaporation may be prevented by a momentary immersion 

 of the whole cage in a tank of water now and then. This 

 wetting will take the place of normal rains. 



4. Miscellaneous preparations showing habits. 



5. Cages and traps for living insects. 



6. Samples of insecticides, fumigants and repellants. 



Equipment for slide mounting and for cage-making. 



There should be a table set apart for making slide mounts, 

 and permanently equipped with one or more dissecting 

 microscopes, needles, forceps, alcohol, clearer, balsam, cover 

 glass, slides, covers, slide labels and slide boxes. 



There should be a bench available for cage making (per- 

 haps in the manual training department), equipped with 

 window-screen wire cloth, tin shears, tinner's folding tongs, 

 hammer and nails. 



