BIRDS IN RELATION TO AGRICULTURE 179 
is nailed on, to keep the nest dry. The top is hinged to the 
back-board, and when in use is fastened down by means 
of a screw, which permits the lid to be opened for the pur- 
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_ Fie. IV.—CONSTRUCTIONAL DETAILS OF A BIRD-HOUSE DESIGNED 
BY THE AUTHOR TO BE MADE FROM SLAB WOOD, USUALLY A 
WASTE PRODUCT FROM SAWMILLS 
The size given is suitable for a bluebird, but the dimensions may be changed in 
accordance with the table on page 180 
1. Cover 3. Back view 
2. Front of box 4. Section of box 
5, Complete house 
pose of cleaning out the old nests. By so utilizing waste 
lumber these boxes were made very cheaply at the sawmill. 
A boy could readily make similar boxes. Fig. IV (5) shows 
the box complete. In the first year (1908) 60 boxes were 
distributed, and 31 per cent were occupied. The number 
