^h 



"I- 



M 



h 



Af /.7 '-J 



ll/l 



I- 



I- 



f 



VI L 



Ho I llOl I^Q3 If fit lf(fi' tfOi 1907 I90l not 1^0 II f/ 



FIG. II. CURVES OF (I) RED-BREASTED NUTHATCH, (II) WHITE-BREASTED 

 NUTHATCH, (III) DOWNY WOODPECKER, (IV) BROWN CREEPER, (V) WHITE- 

 WINGED CROSSBILL, AND (VI) RED CROSSBILL. 



(IS) 



