106 ROD AND RIVER 



occasioned by the movement of the limbs. Fly- 

 fishers who are acquainted with the habits of 

 fishes and insects take advantage of their know- 

 ledge, and by causing their imitation caddis-fly to 

 ripple over the surface, or even to sink beneath 

 it, like the veritable insect, delude the unsuspect- 

 ing fish into swallowing a hook instead of a fly. 



* In process of time the eggs are hatched, and 

 the young larvae then proceed to construct houses 

 in which they can dwell. These houses are 

 formed of various materials, and are of various 

 shapes, and, indeed, not only does each species 

 have its own particular form of house, but there 

 is considerable variety even in the houses of a 

 single species. . . . The materials of which the 

 nest is made depend greatly on the locality in 

 which the insect is hatched, and in a rather large 

 series of caddis nests now before me there are 

 some very remarkable instances of the manner 

 in which the insect has been obliged to adapt 

 itself to circumstances. The most common style 

 of case is that which is composed of a number 

 of sticks and grass-stems laid longitudinally upon 

 each other, like the fasces of the Roman consuls. 

 Of these I have specimens of various sizes and 

 shapes, some being barely half an inch long, 

 while others measure four times that length, the 

 sticks being placed sometimes so irregularly that 

 the home of the architect is not easily seen. The 



