334 lieceittlii ]ii(blis/ied Ornitholoyical IVorks. [Ibi?, 



he distinguishes fourteen races spread over the Palsearctic 

 Region. He divides these fourteen races into three groups, 

 and he believes that when individuals belonging to different 

 groups extend their range towards one another's territory 

 hybridization occurs, and that such hybrids follow the 

 Mendelian laws. Also that in some cases pure-blooded 

 individuals revert to the more primitive types from which 

 they are sprung, and that a clear distinctioii should be 

 drawn between them and the hybi-ids. By means of these 

 hypotheses lie endeavours to account for the many varying 

 forms of Long-tailed Tits met with in the Palaearctie 

 Region. 



With regaid to the Bullfinches the pi'oblem appears more 

 simple, but here, too, the explanation is hybridization 

 between two comparatively distinct forms. The larger, 

 Fyrrhula p. pyrrhula, of the east and north, and the 

 smaller, Pyrrhula p. minor and P. p. pileata^ of the west, 

 have spread out since the Ice Age and met in southern 

 Germany, where a mixed or hybrid form, known as P. p. 

 (/ermanica, has established itself. Such in brief appears 

 to be the views of our author on these difficult and com- 

 plicated questions. 



Bird- Lure. 



[Bird-Lore : A bi-monthly Mag^azine devoted to the Study and 

 Protection of Birds. Vols. xxi. & xxii. for 1919 & 1920.] 



The two volumes of 'Bird-Lore' under notice contain a 

 number of articles of considerable interest, especially to the 

 bird-lover in America, to whom they are specially addressed. 

 We must confine ourselves to mentioning some of those of 

 more general interest. The Editor, Mr. Prank Chapman, 

 during the last part of the war was a travelling com- 

 missioner for the American Red Cross and, in that capacity, 

 made a rapid journey tlircugh South America, visiting 

 Peru. Chile, and the Argentjne. His impressions on the 

 bird-life of those countries will be found in a series of vivid 

 articles illustrated with photographs and draw ings. Perhaps 



