70 METHODS OF ATTRACTING BIRDS 



these houses and two pairs successfully reared 

 young, and doubtless others would have done so, 

 had they not been driven away by the children. 

 In nine cases the sparrows attempted to drive out 

 birds that had begun to build in the moving 

 houses, and in six cases were successful. 



The following season the author advised the 

 children to build more houses for the wren, and 

 make the hole so small that the English sparrow 

 could not enter; in the fall statistics were taken 

 and showed a large increase in the number of 

 wrens nesting and a slight decrease in the num- 

 ber of bluebirds. 



Of 43 stationary houses, the bluebirds reared 

 young in 5, the house wren in 21, and the Eng- 

 lish sparrow in 7. Of 12 moving houses, the 

 bluebirds reared young in 3, the wrens in 3, and 

 the English sparrow in 1. 



During the third season, in 56 stationary 

 houses, 56 pairs of birds began to nest (13 of 

 bluebirds, 20 of wrens, 23 of sparrows) ; 34 reared 

 young (7 bluebirds, 15 wrens, 12 sparrows). In 

 7 moving houses, 6 pairs began to nest (2 of 

 wrens, 4 of sparrows); 3 reared young (2 wrens, 

 1 sparrow). 



The results of the three seasons are summar- 

 ized in the following table, which includes only 

 those birds that reared young : — 



