WORKS OF,:^EFERENCE. 



Spreng'el— Das eudeokte g'eheimniss, der natur im bau und der befruchtung* 

 der blumen. Berlin, 179.S. 



Gray -structural botany, p. 315. 



MacLeod— Li jst von Boeken, Verhandeling:en, enz omtrent de bevruchting- 

 der bloemeii, von 1883 to 1889 verschenen. Botanisch Jaarboek, tweeds jaargang 

 1890. Eruidkundig g'enootschopte Dodonaea te Gent. 



H. Mueller— Die befruchtungr der blumen durch insekten. Leipzig, 1873. 

 English translation by D'arcy W. Thompson, London. 1883. Die alpeublumen, 

 ihre befruchtung durch insekten, und ihre anpassung an dieselbeu. Leipzig, 

 1881, etc,, etc. 



Fritz Mueller— Flowers and insects. Nature. Vol. XVII, p. 78, 1878. Two 

 kinds of stamens with different function in the same flower. Nature, Vol. 

 XXVII, p. 364, 1883, etc., etc 



Axell— Om anordningarna for fanerogama vaxternas b ef ruktning, Stock- 

 holm. 1869, etc., etc. 



Hildebrand— Ueber die befruchtung der salbeiarten durch insekten. Bonn, 

 Sitzber. Niederrheimgesellsch, pp 54-56, 1864. 



On the impregnation of orchids as a proof of the two different effects of 

 pollen. Ann. and Magazine of Nat. Hist., Series 3, Vol. XII, pp. 109-174, 1863. 



Die geschlechter vertheilung bei den pflanzen. pp. 92. Leipzig, 1867. 



John Lubbock— On British wild flowers considered in relation to insects. 

 London, 1875. 



Scientific lectures (Lecture I, flowers and insects). London, 1879. 



Grant Allen— The colors of flowers as illustrated by the British flora Na- 

 ture, Vol. XXVI, pp. 299, 333, 346, 371. London, 1882. 



Delpino— Ulteriori osservazioni suUa dichogamia uel regno vegetable Milan. 

 Part 1, 1868, 1869; Fart II fasc. I, 1870; fasc. II, 1875. 



A. Eerner— Die schuetzmittel der bluethen gegen unberufene gaeste. Vien- 

 na, 1876. Translated by Dr. Wm. *^gle, "flowers and their unbidden guests." 

 London, 1S78. 



Pflanzenleben. Vol. II, p. 91-447. Engl. Translation, Oliver Natural His- 

 tory of Plants. 



Forbes— Selective discrimination of insects. Nature. Vol. XVII, p. 63, 1878. 



Bennett-^Insects and Flowers. Popular Science Review, Vol. XIV, pp. 113- 

 125,1875. 



Francis Darwin— Bees visiting flowers, papilionaceae. Nature, Vol. IX, p. 

 189, 1874. 



Alpine flowers, a review of Hermann Mueller's alpenblumen. Nature, 

 VoL XXIII, p. 333, 1881. 



