323 



like extent of meadows. If any number of these birds found 

 in corn fields is multiplied 1)}' the coefficient 1.16, the product is 

 the number which we may expect to Hud in meadows of the 

 same aggregate area. 



Reading upward from 1 in any column, one gets a descend- 

 ing series of expressions for the densities of the dove popu- 

 lation in crops less attractive than the one named at the head 

 of the column; and reading downward from the same point, a 

 reverse series for crops more attractive to doves than this 

 standard crop. The figures on one side of the diagonal line of 

 I's are the reciprocals of those on the other side. 



Tables of this description will l)e useful for a comparison 

 of the distribution and ecology of the several species at differ- 

 ent seasons and in different situations, and for a comparative 

 study of the statistics of bird distribution in different parts of 

 the state and in different states. 



