i893- HYBRIDITY IN PLANTS. 213 



vol. cxiv., 1892, p 504; Chmielevsky (Spirogyra), Bot. Zeitung, i8go, p. 773 ; and 

 " Materialen zur Morph. und Phys. des Sexualprocesses bei den niederen 

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 Abhandl. Naturw. Ver. Bremen, 1890, p. 413; Guignard (impregnation and tinoleu- 

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 vol, cxii., 1891, pp. 539, 1074, 1320, and Ann. Set. Nat. (Bot. J, vol. xiv., 1891, p. 162 ; 

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 and Bot. Zeitung, 1891, p. 789; Knuth (various papers on pollination), 

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1890, p. 241 ; Loew (various papers on pollination), Abhandl. Bot. Ver. 

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 xxii. and xxiii., 1891 ; M'Leod (Belgian and Pyrenean flora), Bot. Jaarb. (Gent), 

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1891, p. 301 ; Moebius (non-sexual propagation), Biol. Centralbl., 1891, p. 129 

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 (Gladiolus), Comptes Rendus, vol. cviii.,1889, p. 905 ; Overton, " Beitrage z. Kenntniss 

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 1890, p. 206; Rosen (cross- and self- fertilisation), Bo^ Z^Yjoio', 1891, p. 201; Rosen 

 (staining reactions of sexual cells), Cohn's Beitrage, vol. v., 1892, p. 443 ; Schottliinder 

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Alfred W. Bennett. 



