R. N. Salaman and J. W. Lesley 39 



Tliat a process of differentiation jjrior to normal segregation may 

 occur in plants is shown by the work of Bateson(6) and (7) and others. 

 In the present case there is reason to suspect a segregation by which 

 sterility is dropped out of the germ lineage of the sperms but not of the 



In concluding it is a pleasure to acknowledge the help and encourage- 

 ment given us by Prof. R. H. Biffen and the willing assistance of Miss 

 E. Hagger at Barley and Mr Hamilton at Cambridge. 



REFERENCES. 



(1) Salaman, R. N. Limi. 8oc. Jourii. Botany, 39, Oct. 1910. 



(2) East, E. M. Rep. of the Agronomist, 1907, Conn. Agr. Expt. Sta. 



(3) Stuart, W. U.S. Dept. of Agr. Bull. 195, \^15. 



(4) Saunders, E. R. Journ. of Genetics, 1, No. 4, 1911. 



(5) Journ. of Genetics, 1. No. 1, 1910. 



(6) Bateson. Journ. of Genetics, 5, No. 1, 1915. 



(7) Journ. of Genetics, 6, No. 2, 1916. 



(8) Crane, M. B. Journ. of Genetics, 5, No. 1, 1915. 



EXPLANATION OF PLATE II. 



Fig. 1. "Simple" cymose system of male-steiilo F^ jjlant from Edzell Blue x Edgeoote 

 Purple. 



Fig. 2. " Compound" cymose system of male-sterile F^ plant from Edzell Blue x Edgeeote 

 Purple showing variation from the less "compound" type at the apex to the more 

 "compound" type at the base of the shoot. 



Fig. 3. Bunch of self -set berries developed from a compound mflcjrescence of male-fertile 

 Fj^ plant from Edgeeote Purple ;■: Edzell Blue. 



(Received November 3rd, 1921.) 



