4o6 
ORLAND E. WHITE 
2. These results are interpreted as mainly due to the presence and 
absence of an endosperm color suppression factor A. A factor Y for 
yellow pigment is present in both races studied. Zea Caragua (Z 21) 
is to be regarded as homozygous for both A and Y, while California 
Golden Pop (Z 14) is homozygous for the presence of Y and the absence 
of A. 
3. The segregation of other endosperm factors, such as those for 
flint and floury texture, opaque caps, etc., also modified the endosperm 
color expressions. 
4. Including the suppression factor A, at least three and possibly 
five pairs of factors are primarily responsible for endosperm color in 
maize. 
LITERATURE CITED 
1. Burtt-Davy, J. Maize, Its History, Cultivation, Handling and Uses. Long- 
mans, Green & Co., London, pp. xl+831. Fig. 1-245. 1914. 
2. Collins, G. N. Heredity of a Maize Variation. U. S. Dept. Agr. Bur. PI. Ind. 
Bull. 272: 1-23. 1913. 
3. Correns, C. Untersuchungen iiber die Xenien bei Zea Mays. Ber. Deutsch. 
Bot. Ges. 17: 410-417. 1899. 
4. Bastarde zwischen Maisrassen mit besonderer Beriicksichtigung der 
Xenien. Bibliotheca Botanica 53: 1-161. 1901. 
5. East, E. M. A Mendelian Interpretation of Variation that is Apparently Con- 
tinuous. Amer. Nat. 44: 65-82. 1910. 
6. Inheritance in Maize (Review). Bot. Gaz. 55: 404-405. 1913. 
7. East, E. M. and H. K. Hayes. Inheritance in Maize. Conn. Agr. Exp. Sta. 
Bull. 167: 1-141. PI. 1-25. 191 1. (Also Contrib. Lab. Genetics, Bussey 
Inst., Harvard Univ. No. 9.) 
8. Emerson, R. A. Latent Colors in Corn. Ann. Rep. Amer. Breeder's Assoc. 6: 
233-237- 1911- 
9. Emerson, R. A. and E.'M. East. The Inheritance of Quantitative Characters in 
Maize. Nebr. Agr. Exp. Sta. Research Bull. 2: 1-120. Fig. 1-2 1. Tables 
1-39- 1913- 
10. Lock, R. H. Studies in Plant Breeding in the Tropics. HI. Annals Roy. 
Bot. Gardens, Peradeniya 3: 95-184. 1906. 
11. Sturtevant, E. L. Varieties of Corn. U. S. Dept. Agr, Off. Exp. Sta. Bull. 
57: 1-108. 1899. 
