HYBRIDISATION AND SELECTION. 8i 



found in Bull. No. 22^ U.S. Dept. of Agric, 1900. See also 

 Nature, Mar. 15, 1900, p. 470. 



If he wishes to explore the vast region of controversial 

 literature that opens up from these points, and which is 

 far beyond the purpose of this book, he may consult the 

 literature collected in Kassowitz' Allgcmeine Biologic, Wien, 

 1899, B. II., and the references in the works quoted; also, 

 Strasburger, "The Periodic Reduction of Chromosomes in 

 Living Organisms," A7in. Bot, viii., 1894, p. 281. Ycr 

 " Mendel's Law," see Correns in Ber. d. deutsch. bot. 

 Gesellsch., vol. xviii., 1900, p. 158. 



