14 "Rogues" iit Culinary Peas 



mixture, crossing by insects, and the persistent recurrence of ;i recessive 

 form being the most obvious sources of such plants. Rogues referable 

 to these several origins we have of course seen among peas, but the 

 facts preclude the sujaposition that the special rogues with which we are 

 here concerned are introduced either by mixture or crossing, nor can 

 they be regarded as recessives coming from a heterozygoto in the 

 ordinary sense. 



Preliminary Statement of Remdts. 



By Messrs Sutton's advice we began our work in 191 1 with Ne 

 Plus Ultra (N. P. U.), Early Giant (E. G.) and Duke of Albany (D. A.). 

 For some unknown reason N. P. U. did badly on our land, suffering so 

 much from bacterial disease that after 1912 we gave it up. Our 

 observations therefore relate mainly to E. G. and D. A. These two 

 differed considerably in the fact that whereas typical D. A. plants with 

 us have thrown no obvious intermediates between type and rogues', 

 such plants do occur in E. G. and their behaviour raises some curious 

 problems. Our experience of all three varieties may be summarized as 

 follows : 



(«) Thoroughly typical plants do occasionally throw rogues (E. G. 

 and D. A.) and certain intermediate forms {E. G.). 



(b) The rogues, of whatever origin, when fertile'-, have offspring 

 exclusively rogues (N. P. U. ; E. G. ; D. A. ). 



(c) Intermediates {raised front types) shotving combinations of type 

 and rogue characters give mixed families of various compositions 

 {E. G.). 



(d) Crosses betiveen types and rogues, however made, liave (with the 

 rare exceptions mentioned in E. G.) always given rogues though, these in 

 their juvenile condition are generally type-like ; and these rogues have 

 always given only rogues (N. P. U. ; E. G. ; D. A.). 



Description of Rogues. 



Foliar Parts. 



Most of the best modern forms of culinary peas have the stipules, 

 leaflets, petals, and pods, large and broad. Among these typical 

 plants the rogues are distinguished at once by the smallness of their 



1 See later, p. 29, note. 



^ Sterile rogues occur as rare exoeptioiiB. 



