200 MAINE AGRICULTURAL EXPERIMENT STATION. 191I. 



chicks and relatively many solid-colored, then it must also be 

 assumed that the other unrecorded enemies showed a prefer- 

 ence for barred birds, since with all enemies taken together sub- 

 stantially equal proportions of both kinds of birds were elimi- 

 nated. In other words, if we assume a selective elimination in 

 the case of predaceous birds, we are obliged to assume an equal 

 and opposite selective elimination on the part of other unre- 

 corded enemies. There is no evidence on which such an as- 

 sumption could be based. 



