214 
Agnes Arber . — On the Law of Age and Area . 
Literature cited. 
Berry, E. W. (1917 *) : A Note on the ‘ Age and Area’ Hypothesis. Science, vol. xlvi, 1917, 
pp. 539-40. 
■ (1917 2 ) : Geologic History indicated by the Fossiliferous Deposits of the Wilcox 
Group (Eocene) at Meridian, Mississippi. U.S. Geol. Surv., Prof. Paper 108 E, Shorter 
Contributions to General Geology, 1917, pp. 61-72, 3 pis., 1 text-fig., 1 map. 
Christy, M. (1897) : Primula elatior in Britain : Its Distribution, Peculiarities, Hybrids, and 
Allies. Journ. Linn. Soc. Bot., vol. xxxiii, 1897-8, pp. 172-201, 1 map. 
Demoor, J., Massart, J., and Vandervelde, E. (1899) : Evolution by Atrophy. Trans, by 
Mrs. Chalmers Mitchell. Intern. Sci. Ser., vol. lxxxvii, 1899. 
Ridley, H. N. (1916) : On Endemism and the Mutation Theory. Ann. Bot., vol. xxx, 1916, 
PP- 551-74- 
Sinnott, E. W. (1917) : The ‘ Age and Area ’ Hypothesis and the Problem of Endemism. Ann. 
Bot., vol. xxxi, 1917, pp. 209-16. 
Willis, J. C. (1915) : The Endemic Flora of Ceylon, with Reference to Geographical Distribution 
and Evolution in General. Phil. Trans. Roy. Soc., Lond., Ser. B, vol. ccvi, 191 5, pp. 307-42, 
4 text-figs. 
(1916) : The Evolution of Species in Ceylon, with reference to the Dying Out of 
Species. Ann. Bot., vol. xxx, 1916, pp. 1-23, 2 text-figs. 
(1917) : The Relative Age of Endemic Species and other Controversial Points. Ibid., 
vol. xxxi, 1917, pp. 189-208. 
(1918) : The Sources and Distribution of the New Zealand Flora, with a Reply to 
Criticism. Ibid., vol. xxxii, 1918, pp. 339-67. 
