NESTING-BOXES 141 



packing. Care should be taken in hanging up 

 the boxes to follow exactly the directions given 

 in the paper which may be obtained from the 

 secretary of the Society, and it may be further 

 noted that these boxes are made with two 

 different-sized entrance holes, the smaller one 

 only admitting the smaller tits (the blue and 

 the coal tits), and not the great tit or the house 

 sparrow, who are apt to monopolise them and 

 drive away the others ; thus it may be well to 

 try both of these. 



