500 Recently pnldi.slied Ornithological Worlcs. 



typica is discussed at full length, and the complete inter- 

 gradation of these forms in certain localities is conclusively 

 shown. 



87. Chun on the Gerinan Deep-sea Expedition. 



[Aus den Tiefen des Weltmeeres: Scbildeningen von der deutsclien 

 Tiefsee-Expedition. Jena : Gustav Fischer, 1900. 1 vol. 550 pp. 

 Price 18s.] 



This is a well-written and profusely illustrated popular 

 account of the German Deep-sea Expedition of 1898-99, 

 which can be thoroughly recommended to those who can 

 read German. The route was by way of the Atlantic to 

 nearly as far south as Enderby Land, and thence back by the 

 Indian Ocean and the Suez Canal. The biology introduced 

 into the work mostly refers to marine Invertebrates, but 

 there are many allusions to sea-birds, especially to those 

 of the Antarctic Ocean, and some excellent views of Penguins 

 and their breeding-colonies in Kerguelen and other oceanic 

 islands. 



88. Dwiglit on tlie Plvmuges of Passerine Birds. 



[The Sequence of Plumages and Moults of the Passerine Birds of New 

 York. By Jonathan I) wight, Jr. Ann. N.Y. Acad. Sci. xiii. pp. 73-360, 

 pis. i-vii., 1900.] 



In this long pajjcr Dr. D wight has endeavoured to demon- 

 strate the principles underlying the moult and change of 

 plumage of birds, as evidenced by several thousands of 

 examples of Passerine species from New York contained in 

 his own collection. In the place of relying on theories, 

 founded, as they often are, on unreliable information, he 

 takes his stand on the firm basis of facts, which he warns us 

 must be interpreted aright to be of the least value. There 

 seems to him to have been hitherto no serious attempt to link 

 together the successive plumages attained before maturity^ 

 and certainly no endeavour to group North-American birds 

 according to their plumages ; such grouping he therefore 

 desires to effect. Accordingly he classifies them in ten 

 sections, and suliscqucntly gives full details for each species. 



