218 BRITISH BIRDS. 



all that he says, and prove that he has accomplished 

 an extremely valuable piece of investigation in a most 

 painstaking manner. It is this portion (the first ten 

 or eleven sections) that contains most of the new 

 work in the book, and it is only possible here to 

 mention the headings of the remaining sections, which 

 however, contain much valuable information, particu- 

 larly from the point of view of the sportsman. The 

 subjects dealt with comprise : The structure of the 

 wing of the Partridge as an introduction to the study 

 of the moult ; reproduction, pairing, nesting, eggs, 

 incubation, hatching ; different ways of telling old from 

 young birds ; geographical races and individual variation ; 

 weights ; methods of judging the age of birds on the wing. 

 In conclusion the author states that a similar piece 

 of work on the Red-legged Partridge is in an advanced 

 state, but that he had not yet been able to get enough 

 material for a sufficient number of " controls "' and tests. 

 We can only hope that the present season has afforded 

 him the requisite opportunities for obtaining them, 

 and we shall look forward with pleasure to the perusal 

 of Vol. II. of L'Age cJes Perdrix. X.F.T. 



