74 MARVELS OP THE ANIMAL WORLD 



their eggs for thirty-four days ; the red grouse, for 

 about thirty days ; the ring ouzel, for eighteen 

 days ; the swift, for sixteen days ; the moor-hen 

 or water-hen, for twenty-four days ; the cuckoo, 

 for thirteen days ; and the corn-crake or land-rail, 

 for twenty-eight days. 



