246 Recently published Ornithological Works. 
incorporated Count WodzickPs observations on the same bird 
in Poland, and those of Mons. Alleon made on the Bosphorus. 
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 femelles revetent indifferemment la 
livree de Pun ou de Pautre type. 
“Tantot il y a alliance entre sujets d^une meme livree, 
tantot croisement des deux races. 
“ De Pune ou Pautre de ces unions naissent habituellement 
des jeunes d’un seul type, plus rarement on trouve dans une 
meme nichee des jeunes de Pune ou de Pautre race. 
“ Le plumage des deux types se modifie parallelement avec 
Page ; mais ces changements sont plus accuses dans le type 
ordinaire que dans le type negre. 
<e Les sujets des tous deux, depuis le jeune age jusqn’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 adults 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 c Canadian Birds of Prey * 
[Our Birds of Prey, or the Eagles, Hawks, and Owls of Canada. By 
Henry Gr. Yennor, 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- 
