246 Recently published Ornithological Works. 



incorporated Count Wodzicki's observations on the same bird 

 in Poland^ andtliose of Mons. Alleon made on the Bospliorus. 



The memoir is full of interesting details respecting the 

 curious dimorphic condition of the plumage observable in this 

 species, the true interpretation of which was long misunder- 

 stood. Mons. Bureau^s conclusions on this subject are best 

 given in his own words : — 



" Les males et les femellcs revetent indifteremment la 

 livree de Pun ou de Tautre type. 



^'Tantot il y a alliance entre sujets d\me meme livree, 

 tantot croisement des deux races. 



" De Tune ou Pautre de ces unions naissent habituellement 

 des jeunes d'un seul type, plus rarement on trouve dans une 

 meme nicliee des jeunes de I'une ou de I'autre race. 



" Le plumage des deux types se modifie parallel ement avec 

 Fage ; mais ces changements sont plus accuses dans le type 

 ordinaire que dans le type negre. 



" Les sujets des tons deux, depuis le jeune age jusqu'k 

 Page adulte, se developpent en conservant les caracteres de 

 leur type." 



In addition to the discussion of these special points, the 

 paper also contains references to most of the works where 

 the Booted Eagle is mentioned, its geographical distribution, 

 nidification, eggs, descriptions of birds of both sexes and dif- 

 ferent ages from young in down to the adult, and habits ; so 

 that the monograph of the species is a very complete one. 

 On one point Mons. Bureau has been led into error by Dr. 

 Schlegel, where he gives (p. 3) Australia as coming within 

 the range of the species. Aquila morphnoides of Gould, 

 though allied to A. pennata, is a distinct species. 



27. Vennor's ' Canadian Birds of Prey.' 



[Our Birds of Prey, or the Eagles, Hawks, and Owls of Canada. By 

 Henry Gr. Vennor, F.G.S. With 30 Photographic Illustrations by Wm. 

 Notman. 4to. Montreal : 1876.] 



Ornithology has never taken deep root as a scientific study 

 in Canada, and, as yet, we have few books treating of its 

 birds ; we would gladly, then, say as many good words as possi- 



