186 



SALMON FLIES 



being employed for the right wing, and " left " 

 strips for the left (Fig. 95). 



Owing to the peculiar construction of the 

 fibre of these feathers, the strips have to be 

 put on in a manner somewhat different to 

 that which applies, and which has already 



FIG. 95. 



been described, in the case of ordinary sloping 

 or horizontal strip-wings (see pp. 134 to 140), 

 as otherwise they would split. The object is to 

 maintain as far as possible the coherence of the 

 fibres of the strip as a whole, and this is 

 possible only when the fibres are secured so 



