22 J. K. BREITENBECHER. 



4. Of these thirty-one somatic mutations, twenty-two occurred 

 through a mutation from homozygous, recessive black to dominant 

 red ; one through a mutation from homozygous, recessive white to 

 a dominant black ; while eight originated in wild cultures, seven of 

 these mutated from recessive tan to dominant black, and one of 

 these from recessive tan to dominant white. 



5. In conclusion, the most noteworthy result is that somatic and 

 germinal mutations are identical in that both are due to mutations 

 originating in a chromosome. The time in ontogeny at which the 

 mutation occurs determines whether it appears as germinal or 

 merely as somatic. 



LITERATURE CITED. 



Babcock, E. B., and R. E. Clausen. 



'18 Genetics in Relation to Agriculture. McGraw-Hill Book Company, 



New York, pp. i xx, 1675. 

 Breitenbecher, J. K. 



'21 The Genetic Evidence of a Multiple (Triple) Allelomorph System in 

 Bntchns and its Relation to Sex-Limited Inheritance. Genetics, Vol 

 6. PP. 55-90. 

 Emerson, R. A. 



'21 Studies of Somatic Mutations in Varigated Maize Pericarp. I. Relative 

 .Frequency of Dominant Somatic Mutations in Homozygo.us and 

 Heterozygous Variegated Pericarp. (See Abstracts, igth Annual Meet- 

 ing, Amer. Soc. Zool.) 

 Morgan, T. H., and C. B. Bridges. 



'19 Part i. The Origin of Gynandromorphs. Carnegie Inst. Wash. Pub. 



No. 278, pp. 1-123. 

 Sumner, F. B., and R. R. Muestis. 



'21 Bilateral Asymmetry in its Relation to Certain Problems of Genetics. 

 Genetics, Vol. 6, pp. 445-485. 



