POULTRY NOTES. 199 



The above figures include all eliminated birds, those killed by 

 recorded and unrecorded enemies together. If we take only 

 those killed by recorded enemies', which under the conditions 

 prevailing on the plant in 1909 means practically those killed by 

 rats, we have : 



Number of solid-colored birds eliminated by recorded ene- 

 mies =--6. 



Number of barred birds eliminated by recorded enemies =68. 



From these figures the following proportions are derived : 

 Of the total number of birds 10.05 P^^ cent, were solid-colored. 



Of all the eliminated birds 10.77 P^^ cent, were solid-colored. 



If we consider by themselves the birds eliminated by recorded 

 enemies, we have : 



Of the birds eliminated by recorded enemies 8. 11 per cent, 

 were solid-colored. 

 ■ Putting the figures in another way we have : 



Of the solid-colored birds 10.42 per cent, were eliminated by 

 all enemies. 



Of the barred birds 9.64 per cent, were eliminated by all ene- 

 mies. 



Of the solid-colored birds 1.79 per cent, were eliminated by 

 recorded enemies (chiefly rats). 



Of the barred birds 2.26 per cent, were eliminated by recorded 

 enemies. 



Of the solid-colored birds 8.63 per cent, were eliminated by 

 unrecorded enemies (chiefly predaceous birds). 



Of the barred birds 7.38 per cent, were eliminated 'by unre- 

 corded tncrmes (chiefly predaceous birds). 



The conclusion to be drawn from these figures, which involve 

 a large number of individuals, is obvious. It is that the relative 

 inconspicuiousness of the barred color pattern afforded its pos- 

 sessors no great or striking protection against elimination by 

 natural en'emies, during the season (April i to October i) of 

 ipop on the poultry range of the Maine Experiment Station. 

 It might be objected that if the eliminations by predaceous birds 

 alone could be separately recorded it would then be found that 

 against this class of enemies the barred pattern had great pro- 

 tective value, as suggested by Davenport's figures. This, how- 

 ever, can hardly be the case in the present statistics since if it 

 be assumed that predaceous birds killed relatively few barred 



