May, 1920.] YASUI :—GENETICAL STUDIES. £5 



Takezaki, Y. (1918) Genetical studies in Morning Glories. (Japanese) Bull. 



Japan. Breed. Soc. T, No. 2. p. 7. 

 Wheldale, M. (1916) The anthocyanin pigments of plants. Cambridge. 



WlLLSTATTER U. EVEREST. (1913, &C.) V. SHIBATA (1915) S. 118. 



de Vries, II. (1901) Mutationstheorie. Bd. I. p. 551 Leipzig. • 



Explanation of Plate I 



Fig. 1. White single (P). 



Fig. 2. Pale yellow single (P). 



Fig. 3. Fi-plant of .White single X Pale \'ellow single. 



Fig. 4.-8. F2-individuals of White single x Pale yellow single. Fig. 4. 

 White like P. Fig. 5. Pale yellow like P. Fig. 6. Magenta 

 like Fi-plant. Fig. 7. Deep magenta. Fig. 8. Yellow. 



