280 



THE AMERICAN NATURALIST [Vol. LIV 



Since the first term becomes much larger than the second as p 

 increases, the number of homozygous normals becomes very great 

 compared with the heterozygous normals. 



J. A. Detlepson, 

 W. W. Yapp 



University of Illinois 



LITERATURE CITED 



1. Bateson, Wm. 



1913. Mendel 's Principles of Heredity. University Press, Cambridge, 

 England. 



2. Davenport, C. B. 



1911. Heredity in Relation to Eugenics. Henry Holt & Co., New 

 York. 



3. Jones, D. F., and Mason, S. L. 



, Jones, D. F., and Mason, S. L. 



1916. Further Remarks on the Inheritance of Congenital Catarac 

 Am. Nat., 50: 751-757. 

 , Harris, J. A. 



1912. A Simple Test of the Goodness of Fit of Mendelian Ratic 



1919. Hereditary Cataract in Calves. Am. Journ. Ophth., 2: 681- 



FURTHER OBSERVATIONS ON SEX IN MERCURIALIS 

 ANNUA 



In an earlier paper/ I briefly mentioned the occurrence of so- 

 called monoecious forms in Mercurialis annua, I have since 

 then continued my studies upon such forms and this report deals 

 with the offspring of the so-called monoecious plant, No. 3. It is 

 to be noted that Mercurialis annua is described as appearing in 



Dec, 1919. 



