346 BRITISH BIRDS. [vol. vii. 



sunshine by its warbling. I spent a breeding-season at a 

 spot south of Drontheim in Norway where the Redwing 

 was quite numerous, and where its very distinctive " leery, 

 leery " notes could be heard all round. I am not aware 

 that these characteristic notes, which are part of the full 

 song, have ever been heard in England. 



William Serle. 



A PAIR OF ROBINS BUILDING MANY NESTS. 



In Volume V., p. 132, I recorded the fact that a pair of 

 Robins [Dandalus r. melophilus) had built, in 1911, twenty- 

 three incomplete nests in a stack of pipes. In 1913 the 

 Robins returned to the pipes and again started several nests, 

 but did not use one. This year they have done the same 

 again, but now one pipe has a completed nest containing 

 hard-set eggs. J. H. Owen. 



HOOPOE IN STAFFORDSHIRE. 



On April 16th, 1914, a Hooj)oe (Upupa e. epops) paid a short 

 visit to the lawn of Trentham Vicarage. 



W. Wells Bladen. 



INCUBATION-PERIOD OF PEREGRINE FALCON. 



A Peregrine's egg hatches m twenty-eight days, and only 

 rarely does real incubation start with any number of eggs 

 short of a full clutch. This I have proved from having 

 known all the eggs of different clutches hatch out on the 

 same day. It is true, of course, that one of the Peregrines 

 often covers, or half-covers, the first and succeeding eggs 

 deposited, but it is seldom that " sitting " is then of sufficient 

 duration to " turn " them. Naturally, however, when the 

 occasion does arise that incubation really commences with 

 any number of eggs short of the full clutch, a few days longer, 

 so far as touches the " sitter," must be allowed for the 

 hatching of one or some of the eggs. As to the number of 

 the " few days," that, of course, entirely depends on as 

 to when exactly real " sitting " started, as well as — even 

 then — on the interval between the laying of each egg. 

 Usually this interval is two days (i.e. forty-eight hours), 

 but rarely it extends to three, and very rarely to four, days. 

 But this three and four days generally only applies to the 

 interval between the depositing of two eggs of a " set," 



