222 LOCK : 



the corolla and a rather flat limb. Habit practical identical 

 with var. A. 



The cross with var. Aa showed hardly any describable 

 difference from the last. 



The crosses with the obviously hybrid var. D showed 

 segregation in colour of pollen and bulge of corolla. But all 

 the plants — 32 in all — were similar in habit, and showed no sign 

 of any of the other characteristic features of var. E. Plate 

 25 shows the bulged type of flowers. 



Among 91 plants of F 2 obtained by self-fertihzation from 

 7 of the above plants, the var. E type reappeared in 6 indi- 

 viduals, one other plant differed from these in one respect only. 

 This plant had long stamens and a short style, instead of short 

 stamens and a long style. Want of knowledge of the previous 

 history of this strain makes it impossible to decide whether 

 this sudden and discontinuous appearance of heterostyUsm 

 is novel or " reversionary " in nature. 



A brief note may be added as to the offspring of each of the 

 7 F 1 plants under discussion. 



65/08 : Offspring of 68/07. One plant of type E is included 

 in the w andf groups in Tables IV. and V. It is also included 

 among the dwarfs in the classification of these 12 plants into 

 9 tall and 3 dwarfs. There is some doubt, however, whether 

 dwarfing is not due to disease in all the cases observed, except 

 those represented by plants of type E. If this is so, the figures 

 suggest that the disease (or liabihty to the disease) causing 

 the stunted appearance of certain plants is itself a recessive 

 character. 



66/08 : Offspring of 69/07. Among 12 plants, one was 

 noted as dwarf with a bulged tube. In the remaining plants 

 b and f were not distinguished. No representative of type 

 E was seen. 



67/08 : Offspring of 70/07 (plant with funnel-shaped corolla 

 and white hmb and pollen). Among 24 plants, there were 

 two exact replicas of E and one apparently representing the 

 short styled form of it. The latter produced seed in fair 

 abundance, whilst the former produced none. The remaining 

 21 plants were of normal size, all had white hmb and pollen, 

 and funnel-shaped flowers all very much ahke. 



