iqi2] SHULL— LYCHNIS AND PAP AVER 135 



4. East, E. M., Inheritance in maize. Bull. 167, Conn. Agr. Exp. Sta. 

 pp. 142. pis. 25. 191 1. 



5. Gortner, R. A., Spiegler's " white melanin" as related to dominant and 

 recessive whites. Amer. Nat. 44:497. 1910. 



6. , Studies on melanin: III. The inhibitory action of certain phenolic 



substances upon tyrosinase. Jour. Biol. Chem. 10:113-122. 1911. 



7. Gregory, R. P., Experiments with Primula sinensis. Jour. Genetics 

 1:73-132. pis. 3. figs. 2. igu. 



8. Keeble, F., and Pellew, Miss C, White-flowered varieties of Primula 

 sinensis. Jour. Genetics 1 : 1-5. 191 1. 



9. Keeble, F., Pellew, Miss C., and Jones, W. N., The inheritance of 

 peloria and flower-color in foxgloves (Digitalis purpurea). New Phytol. 

 9:68-77. fig. 1. 1910. 



10. Saunders, Miss E. R., On inheritance of a mutation in the common 

 foxglove (Digitalis purpurea). New Phytol. 10:47-63. pi. 1. figs. 14. 

 1911. 



11. Shull, G. H., The "presence and absence " hypothesis. Amer. Nat. 

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12. 1 A simple chemical device to illustrate Mendelian inheritance. 



Plant World 12:145-153. pi. 1. fig. 1. 1909. 



13* , Color inheritance in Lychnis dioica L. Amer. Nat. 44:83-91. 1910. 



14. Spiegler, E., Ueber das Haarpigment. Beitr. Chem. Physiol. Path. 



4:40. 1904. 

 15* Wood, T. B., Note on the inheritance of horns and face-color in sheep. 



Jour. Agr. Sci. 1:364. 1906. 



