UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



BOTANY 



Vol. 5, No. 11, pp. 301-346, plates 37-48 January 17, 1917 



THE NATURE OF THE Fi SPECIES HYBRIDS 



BETWEEN NICOTIANA SYLVESTRIS AND 



VARIETIES OF NICOTIANA TABACUM 



WITH SPECIAL REFERENCE TO THE CONCEPTION 

 OF REACTION SYSTEM CONTRASTS IN HEREDITY 



BY 



T. H. GOODSPEED and R. E. CLAUSEN 



UNIVERSITY OF CALIFORNIA PRESS 

 BERKELEY 



