26 



ETON NATURE-STUDY 



nest box, a small cage, about six inches by five inches, should be 

 used, such as can be obtained at a bird fancier's ; the door, which 

 is at one end, should be taken off, a number of good sized holes 

 should be bored in the floor, and a piece of carpet laid over 

 it. After this the whole structure should be covered with 



Photograph by Wilfred Mark Webb. 



FIGURE 161. A Series of Chickens of the same brood at different ages showing the 

 replacement of the downy covering by feathers. The fifth primary feather of the 

 right wing is shown at the side of each specimen. (From the specimens in the 

 British Museum, Natural History, presented by Mr W. B. Tegetmeier.) 



brown paper, except on the bottom and at the open end, which is 

 to hang against the outside of the breeding cage so that the birds 



