MAY-FLIES AND THEIR NEIGHBOURS 227 



ot their own cases until they were completely en- 

 cased in a new tube, they occupied just about three 

 hours : which, consideiing that they had no choice 



of material other than that i)rovided, appeared to 

 me to be rather smart w ork. 



To remove a caddis-worm trom its case is no 

 eas\" matter, and it I refer my reader to Fiy. i 50, 

 where is shown ,a mat^nihed \'iew ot the latter end 

 of the body of a caddis-oTub, showiny the hornv 

 hooks bv means of which it retains hold ot its 



