Technique .—For studying the chitinous parts, 
e.g., of the proboscis or genitalia : 
1. Boil in ten per cent, potash until sufficiently 
transparent. If required, bleach the parts by means 
of chlorine gas (p. 409). 
2. Wash thoroughly, stain, if required, with a 
saturated solution of (basic) fuchsin. Wash. 
3. Dehydrate, clear and mount in balsam as for 
sections. 
