72 



Bird Migratiou. 



[January 



unusLKiUy high or low temperature (for the locality and time of 

 the year) are among the atmospheric conditions that are known to 

 exert marked effects upon the movements of birds. The opening 

 of the leaves and. the flowering of certain plants, with the correla- 

 tive appearance of a multitude of insects, are also among the 

 factors that have to do with the abvmdance of many species. 

 Hence the careful registration of certain meteorological phenonn- 

 ena, and of the state of advancing vegetation from day to day, 

 w^ill constitute prominent items in the record books of the observer. 

 For the purpose of rendering the result of the season's work 

 as full and valuable as possible, the Committee earnestly solicits 

 the co-operation of every ornithologist, field-collector, sportsman, 

 and observer of nature in North America. Indeed, a large 

 corps of observers is absolutely essential to the success of the 

 undertaking, 'and the Committee hopes to receive substantial aid 

 from many who profess no knowledge of ornithology. Efiicient 

 service can be rendered by those familiar with only our common- 

 est birds, and the Committee will gladly accept data concerning 

 any of the following well-known species : — 



Robin. 



Mockingbird. 



Catbird. 



Brown Thrasher. 



Bluebird. 



House Wren. 



Yellow-rumped Warbler; Myrtlebird. 



Yellow-breasted Chat. 



Redstart. 



Maryland Yellow-throat. 



Cedarbird ; Waxwing. 



Purple Martin. 



Barn Swallow (fork-tailed). 



Violet-green Swallow. 



Scarlet Tanager. 



Pine Grosbeak; Bullfinch. 



Purple Finch. 



Red-poll Linnet. 



Yellowbird; Thistlebird. 



Snow Bunting. 



Eastern Chewink : Towhee. 



Junco; Slate-colored Snowbird. 



Cardinal Redbird. 



Rose-breasted Grosbeak. 



Indigo-bird. 



Bobolink; Ricebird. 



Cowbird. 



Yellow-headed Blackbird. 



Red-shouldered Blackbird. 



Meadow Lark. 



Oriole. 



Crow Blackbii'd. 



Horned Lark ; Shore Lark. 



Kingbird; Bee Martin. 



Pewee ; Phoebe. 



Eastern Hummingbird. 



Eastern Chimney Swift. 



Whippoorwill.* 



Nighthawjc.f 



Kingfisher. 



Fish Hawk. 



Wild Pigeon. 



Also any of the Waders, "Shore-birds," and Ducks. 



* When first heard. 



t When first seen. 



