628 
Willis .— The Origin of Species. 
Literature cited. 
1. Bower, F. O. ( 1918 ) : Natural Classification of Plants (Hooker Lecture). Journ. Linn. Soc., 
xliv, 1918, p. 107. Cf. especially p. 119. 
2 . Coe, C. C. : Nature versus Natural Selection, London, 1895. 
3 . DE Vkies, H. ( 1910 ) : The Mutation Theory. Engl, trans. London, 1910. 
4 . Guppy, H. B. ( 1906 ): A Naturalist in the Pacific, vol. ii. London, 1906. 
5 . -( 1917 ) : Plants, Seeds, and Currents in the West Indies and Azores. Ibid., 1917. 
6. Hooker, J. D. ( 1853 ): Botany of the Voyage .. . Erebus and Terror. Vol. ii, Flora of New 
Zealand. London, 1853. 
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11 . - ( 1902 ) : Studies of. . . Podostemaceae. Ann. R. B. G. Perad., i, 1902, p. 267. 
12 . - ( 1906 ): The Flora ofRitigala. Ibid., iii, 1906, p. 271. 
13 . - ( 1907 ): Some Evidence against . . . Natural Selection . . . Ibid., iv, 1907, p. 1. 
14 . - ( 1907 ) : Further Evidence against . . . Natural Selection . . . Ibid., p. 17. 
15 . - ( 1907 ) : Geographical Distribution of the Dilleniaceae. Ibid., p. 69. 
16 . ( 1907 ): The Floras of Hill-tops in Ceylon. Ibid., p. 131. 
17 . - ( 1915 ) : The Endemic Flora of Ceylon. Phil. Trans., B., ccvi, 1915, p. 367, and 
correction in Proc. Roy. Soc., Bot., Ixxxiv, 1916. 
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19 . -and Yule, G. U. ( 1922 ) : Some Statistics of Evolution and Geographical Distribution 
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20 . Yermoloff, N. ( 1922 - 3 ): On Navicula. Proc. Linn. Soc., 1922-3. 
