RANKIN'S DUCK BOOK 

 The Necessity of Green Food. 



It must be remembered that as the broods grow older the 

 cleaning process must be repeated oftener, as their capacity 

 for generating filth will always be in proportion to their size. 

 Those unacquainted with duck-culture have little idea how 



c 

 a 



fast these birds will grow; how soon they will successively 

 outgrow brooders, pens and yards, and how soon every vest- 

 ige of green will disappear from yards that were thickly cov- 



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