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Ber. Senckenherg. Naturf. Ges. 54:49-67. 

 Brewster, William. 1890. Summer robin roosts. ^«^ 7:360-73. 



. 1895. A flight of pine grosbeaks. Ibid. 12:245-56. 



Bridges, C. B. 1921. Gametic and observed ratios in Z)ro50^////o. Amer.Nat. 



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 Brooks, W. K. 1885. The life history of the Hydromedusae. Boston Soc. Nat. 



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 Brown, C. R., and M. Hatch. 1929. Orientation and "fright" reactions of 



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 Browne, F. Balfour. 1929. On the habits of certain social caterpillars. Br. 



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 Brownlee, J. 1915. Studies in the meaning and relationships of birth and 



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 Brues, C. T. 1903. On sleeping habits of some aculeate Hymenoptera. Jour. 



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368 pp. 



