S. C. Harland 221 



Conclusion. 

 From these results it may be concluded that the determinate and 

 indeterminate habits of growth in Dolichos lahlah constitute a simple 

 allelomorphic pair of characters, with complete dominance of indeter- 

 minate habit. The factor for indeterminate habit w411 be denoted by 

 the symbol I. 



2. Anthocyanin Colouration of Flower, Seed, and 

 Vegetative Parts. 



The cross which has just been discussed was made primarily with 

 the object of elucidating the mode of inheritance of growth habit. 

 Both parents were white flowered, while the two F^ plants were purple 

 flowered. The first case of this kind was recorded in Sweet peas, and 

 investigated by Messrs Bateson and Punnett and Miss Saunders (1905). 

 In the Sweet pea, two white parents each contain a factor, which alone 

 is incapable of forming colour. Each of these two factors is independently 

 inherited and thus in F^ the ratio of coloured individuals to white is 

 9 : 7. The symbols used to represent the two complementary factors are 

 C and R, their respective allelomorphs being represented by c and r. 

 Miss Saunders (1909) has also shown that in Stocks {M atthiola) coXowxedi 

 Fi may be produced by crossing two types both devoid of sap colour. 

 The ratio between sap-coloured and non-sap-coloured plants in F^ is 

 approximately 9 : 7. The appearance of the sap-colour is due to the 

 presence of two complementary factors. The case of Antirrhinum, 

 studied by Miss Wheldale (1907), may also be briefly referred to. In 

 this plant the appearance of the red and magenta flower colours is 

 similarly dependent on the presence of two complementary factors. 

 One of these factors produces either a bright yellow or a very pale 

 " ivory " yellow in the flowers, while the other complementary factor 

 may be present in actual whites. 



The results of experiments on the inheritance of flower colour in 

 Dolichos will now be dealt with. 



The Experimental Results. 

 St Vincent Bush White x Vilmorin's Stringless White. 

 The Fi. There were two plants, both purple-flowered. 

 The F2. Families were grown from both the above plants. The 

 results from the combined families are as follows : 



Expected 



