230 SCIENCE OF HOME AND COMMUNITY 



FIG. 85. Three types of nesting boxes. 



The following table gives a few essential points regarding 

 the size of bird houses. 



Bluebird. Below are given directions for building a house 

 for a bluebird. This house seems to be the best type, 

 although other types are frequently used by birds. The 

 long dimension of the house should run up and down ver- 

 tically. For the floor use a piece of board 6 inches square, 

 for the back a piece 12 inches long, for the front a piece 

 10 inches long, and for the sides two pieces 1 1 inches long 

 on one edge and g-J inches long on the other edge. When 



