58 THE BOTANICAL MAGAZINE. [Vol. xxxiv »o. 401. 



Table 1. 





Single 



Double 



Total 



Pedigree No. 18 White ... 



... 13 



15 



28 



„ Magenta 



... 15 



15 



30 



Act. observ 



... 28 



30 



58 



Theor. expect, as 1: \ 



... 29 



29 



58 



Deviation 



... -1 



+ 1 





Wabs 



... ±4.31 



±4.31 





28 singles and 30 doubles in 58 individuals, may be taken, as 

 is seen from the table, for 1 : 1 ratio. 



Experiment 2. When selfed, no doubles arise from the single. 



Experiment 3. Only two of the 30 double individuals selfed of- 

 fered seeds, and the F2 generation raised is shown here in the table 2. 



Table 2. 



Double Single 



Pedigree No. 38 23 6 



39 29 4 



Act. observ 52 10 



Theor. expect, as 3 : 1 46.5 15.5 



Deviation +5.5 —5.5 



m a bs ±3.49 ±3.49 



Dev./m a bs 1.58 1.58 



Experiment $. Several single individuals were mated with the 

 pollen of the double individuals of the pedigree in the experiment 1. 

 The result appeared in the next generation is shown in the table 3. 



Table 3. 



Total 



214 



221 



Single 



Double ... 



... 8,24,10, 8,23,18,4,15, 8, 9,4,4,11,3,11,19, 6,15, 5,1,5,3 

 ... 5, 29, 5, 20, 14, 22, 2, 30, 6, 12, 2, 4, 9, 4, 14, 17, 4, 5. 6, 2, 3, 6 



Total 



... 13, 53, 15, 28, 37, 40, 6, 45, 14, 21, 6, 8, 20, 7, 25, 36, 10, 20, 11, 3, 8, 9 



435 



THE GENERAL CONSIDERATION OF THE EXPERIMENT A. 

 The 3 : 1 ratio in the table 2 indicates that the individuals of Nos. 

 38 and 39 were of the nature of simple Mendelian hybrids between 

 a double and a single, and that the doubleness is dominant to the 

 singleness. If D denotes the presence of the alleromorphic id 1 related 



1) The term " id " is used here simply in the sense of unit structure of idioplasm 

 (K. Fujii, 1920 : Bot. Mag. vol. 34, pp. (100)-(101) (Japanes)), and not in the senses 

 used by Weismaxn. 



