226 MINUTE MARVELS OF NATURE 



their tubes in a remarkably short time. From 

 several of the cases shown on the photograph I 

 had to remove their inmates for the purpose of 



Fig. 150. Magnified view of the end of the body of 

 a caddis-larva. Showing the hooks by means of 

 which it retains attachment to its case 



this illustration. These I then supplied with the 

 remnants of one or two old cases, which, after 

 turning them over suspiciously for some time, 

 while probably thinking of hungry sticklebacks, 

 they at last proceeded to work together with all 

 speed into new cases. From the time of removal 



