Recently published Ornithological Works. 565 
and D. Seth-Smith; while the following articles deal with 
separate species of birds : Mr. F. E. Blaauw on Bernicla 
melanoptera (pi.), Miss Dorien Smith on Tadorna variegata, 
Mr. T. H. Newman on Columba leuconota (col. pi.), Mr. II. 
Will ford on Turacus corythaix and Oriolus trailli (pi.), 
Mr. P. Galloway on Dendrocopus minor , Mr. C. Maxwell on 
Cinnyris asiaticus, Miss K. Carrey on Loxia curvirostra , 
Miss A. Hutchinson on Bucorax cafer. Articles on practical 
Bird-keeping treat of Doves (Miss Alderson) and Parrakeets 
(Mr. Seth-Smith). 
67. Dubois on new Birds from Congoland. 
[Decriptions d’oiseaux nouveaux du Congo Beige, par le Dr. Alpli. 
Dubois. Bev, Fran^. d’Ornithologie. No. 22. Fevrier, 1911.] 
Dr. Dubois describes three new birds from the Belgian 
Congo under the names Dendromus kasaicus , Cinnyris chloro- 
pygius var. pauwelsi , and Zoster ops virens var. reichenowi. 
He does not state where the specimens upon which these 
names are based are to be found, but we presume that they 
are in the Congo Museum at Tervueren. 
68. Eckhardt on the Migration of Birds. 
[Die geographisclien Grundlagen des Vogelzug Problems. Von 
Dr. Willi. Eckhardt, Aachen. Petermann’s Mitteilungen, 56. Band, 
1910, p. 241.] 
Ornithology, like other branches of Biology, is closely 
connected with Geography. We are therefore pleased to find 
an ornithological article in one of the leading Geographical 
Journals. Dr. Eckhardt, who has previously written on 
Bird-migration, gives us here a general sketch of this 
important subject, but does nob appear to have pushed its 
elucidation much farther, nor to be very well acquainted 
with some of the recent practical work in connection with 
it. We cannot believe that the rise and fall of the barometer 
has so much to do with migration, as some writers have 
supposed. 
2q 
SER. IX.—VOL. V. 
