H. Martin Leake and B. Ram Pbrshad 



19 



proof that these three factors are one and the same, it does afford a 

 certain amount of support to this conclusion ; and it indicates that the 

 difference between the Group III and IV colours is most probably to be 

 sought in the factor developing the purple colour or in some factor 

 associated therewith. 



Correlation between vegetative period and the P Jactor. 



Date W LP 

 January 



10/17 _ — 

 19 — ~ 

 2X — ~ 



22 - — 

 24-3 

 26—3 

 28—1 

 30 — 8 



February 



1 



3 



5 



7 



9 

 11 

 13 



15 2 

 17 16 

 19 3 

 21 9 



23 6 

 25 7 

 27 7 



- 8 



- 8 



- 3 



- 9 



- 10 

 3 18 

 2 13 



3 

 5 

 4 

 3 

 2 



March 



3 — 



4 — 



Date IF Pir RP 



January 

 6/11 

 13 

 15 

 17 

 21 

 22 

 24 

 26 

 28 

 30 



February 



1 



3 



5 



7 



9 



11 



13 



15 



17 



19 



21 



23 



25 6 

 27 7 



2 



— 2 



— 5 



— 6 



— 6 



— 13 



21 



13 



19 



11 



16 



18 



11 



13 



13 



14 



6 



3 



3 



13 



10 



14 



13 



16 



3 



8 



2 



3 



Date MP PPC PP 



January 



9 

 13 

 15 

 17 

 19 

 21 

 23 

 24 

 27 

 29 

 31 



— 2 



Date MP CPC A, 



1 I February 



March 



1 13 

 3 5 



5 2 



2 



4 



6 



8 



10 



11 



13 



16 



18 



19 



21 



23 



25 



27 



13 



10 



15 



15 



5 



10 



5 



3 



1 



2 



1 



1 



January 



10/16 — 



18 — 



20 — 



21 — 

 23 — 

 25 — 

 27 — 

 29 — 

 31 



— 3 



19 

 14 

 17 

 10 

 18 

 14 

 15 

 5 

 9 



February 



2 



4 



7 



8 



10 



12 



14 



16 



18 



2 11 



7 7 



10 2 



1 

 2 

 4 



20 14 

 22 9 

 24 14 

 26 21 

 28 15 



16 

 20 



47 

 42 

 39 

 17 

 31 

 17 

 10 

 4 



3 



March 



4 — 

 6 — 



March 



2 



4 



6 



8 



10 



12 



14 



6 

 12 

 2 

 5 

 2 

 2 

 1 



A further point worthy of note is what may be termed the partial 

 dominance of the P factor as indicated, not only by the flower colour, 

 in which the heterozygous form P is distinct from the pure form, but by 

 the intermediate length of the vegetative period of the impure form. 

 The difference in the length of the vegetative period is sufficiently 

 great to leave an interval of a week or more between the early flowering 

 (PP) and the late flowering (pp) forms. During the interval only the 

 intermediate, impure, flower colour will appear. Casual visits to the plots 

 may, therefore, lead to very erroneous conclusions as to the character of 



2—2 



