70 y- The Ool ovists' Record, September i, 192 1. 



In advance I will hazard the opinion that he will not find both 

 these Cuckoos laying together on more than one occasion next 

 year. One will dominate the other, and I shall be surprised if 

 he finds more than one or two eggs, if any at all, of the second 

 Cuckoo. 



As is pretty generally known, I am hoping to publish, in due 

 course, considerable data respecting the egg-laying habits of the 

 Cuckoo, only basing my conclusions upon practical experience, 

 and that of such competent and accurate observers as Mr. G. J. 

 Scholey. 



Yours faithfully, 



Edgar P. Chance, M.B.O.U. 

 The Editor, 



" Oologists' Record." 



THE HEN HARRIER IN FRANCE. 



In his notes in the March issue, Mr. J. Bishop related the finding 

 of a colony of the Hen Harrier in France. Some of the eggs secured 

 were afterwards submitted to the Rev. F. C. R. Jourdain who has 

 pronounced them to be those of Montagu's Harrier. Three of the 

 eggs taken by Mr. Bishop from different nests average as large as 

 43 by 33"6, and are considerably larger, especially as to breadth, 

 than the average of 100 eggs of Montagu's Harrier. In communica- 

 ting these facts to us, Mr. Bishop adds that he had previously had 

 little experience of Harriers and had no chance to note the essential 

 points of difference in the birds themselves. The size of the eggs also 

 misled him. 



"THE BOOK OF BIRDS.' 



By Henry W. Henshaw, formerly Chief of the U.S. Biological 

 Surve}/, illustrated in natural colours from 250 paintings by Louis 

 Agassiz Fuertes and including chapters on " Encouraging Birds 

 Around the Home," by F. H. Kennard ; "World Record of 

 Feathered Friends," by Gilbert Grosvenor ; " The Mysteries of 

 Bird Migration," by Wells W. Cooke; and " How Birds can take 

 their own Portraits," by George Shiras 3rd, and 45 reproductions 

 from photos and 13 charts. 



