01 



Fig. 51. A DOUBLE NEST. 



Note that these nests are placed on a mowing machine knife. 

 It is well to provide projections in suitable places for these birds 

 to build upon. 



Barn Swallows make their nests or pellets of mud held to- 

 gether with bits of straw; bit by bit, these are attached to 

 the side of a beam until the half-bowl-shaped structure is 

 complete; the inside is always very warmly lined with soft 

 feathers from barnyard fowls. Sometimes these nests are 

 plastered to beams that are fairly smooth, and in such cases 

 are very apt to be loosened and fall. Usually a very rough 

 beam or a spot where there is a splinter or a nail projecting. 



