2 Inheritance in the Japanese Convolvulus. Part II 



9 purple : 3 pink : 4 white. Tschermak^ also got similar results in 

 Pisum sativum. All these cases shew that the cooperation of the two 

 factors is necessary for the production of anthocyanin. 



The fact that the diluting or modifying factor is present in the flower 

 of Matthiola was confirmed by Saunders-; Bateson and Punnett^ also 

 reported a case in Lathyrus that can be explained by the presence of 

 the diluting factor. 



Baur^ found in Antirrhinum that zygotes heterozygous for L in the 

 presence of D are pale magenta in flower-colour, whereas those homo- 

 zygous for L are intermediate magenta in the same respect. Marryat^ 

 discovered in Mirabilis the occurrence of heterozygous forms with flower 

 colours which may be best represented by the following formulae : 



CCMM crimson 



CcMM magenta 



CcMm magenta rose 



CCMm orange red 



CCmm yellow 



Ccmm pale yellow 



A case where the effects of the one factor, T, are not manifested 

 unless the other, L, is at the same time present in the zygote was 

 studied by Wheldale" in Antirrhinum; namely, no magenta colour 

 appears in the flower tube unless there is magenta colour in its lips. 



Bateson^ studied the relation between the colour and the shape of 

 flower in Lathyrus, and found that in that having the hooded standard 

 the colours of the standard and wings agree with each other, but in that 

 having the erect-standard they do not. 



EXPERIMENTS. 

 I. i^2 GENERATION. 



As the characters of both parents as well as the F^ plant are already 

 described in Part I* of this paper I will not repeat them here, but as 

 to the flower-colour of each F^ plant, though it was described in the 



1 Zeitschriftfilr induktive Abstammungs und Vererbtingslehre, 1912, Bd. vii. pp. 81 — 234. 



2 Proceedings of the Royal Society, Vol. lxxvii. 1905, pp. 236 — 238. 



3 Reports to the Evolution Committee of the Royal Society, 1906. III. p. 38. 



■* Zeitschrift fiir induktive Abstammungs und Vererbungslehre, 1910, Bd. iii. pp. 34 — 98. 

 •^ Reports to the Evolution Committee of the Royal Society, 1909. V. pp. 42 — 46, 

 fi Proceedings of Royal Society of London, 1907, Vol. lxxix. B, pp. 288 — 305. 

 7 Journal of Genetics, Vol. viii. No. 1, pp. 61, 62. 

 s 7..C. pp. 61, 62. 



