Page:Darwin - The various contrivances by which orchids are fertilized by insects (1877).djvu/14

Müller, Hermann.—'Alpine Orchids adapted to Cross-fertilisation by Butterflies.'—Nature, Dec. 31, 1874.

Delpino.—'Ulteriori Osservazioni sulla Dicogamia nel Regno vegetale.' Parte seconda, fasc. ii. Milan, 1875, pp. 149, 150.

Lubbock, Sir J.—'British Wild Flowers.' London, 1875, pp. 162–175.

Fitzgerald, E. D.—'Australian Orchids.' Part I. 1875, Part II. 1876. Sydney, New South Wales.