218 
soaking in the latter, the specimen may be picked out on 
the point of a needle and placed in the middle of a melted 
drop of glycerine jelly on a glass slide. The cover glass 
(which may be warmed) should be gently pressed down on 
to the specimen so as to bring the sete into one plane. 
Sections of post-larval stages should be thin (not more 
than 4 or 5u) if they are to be of much use. 
