1023 



of crossings amounted to 20 ; the first generation consisted of 30 

 plants, whicli all had blue flowers. In different years further cultures 

 of the 2"'^ 3'"'^ ,and 4''^ generation were j^rown. The following table 

 gives a survey of the observations on both reciprocal crossings, since 

 the two sets agree. Circumstances prevented the second generation 

 from being cultivated in 1910; it was obtained for the first time 

 in 1911. 



jwhitelBluel ^^^ 



Deviation 



Fo 1911 134 482 0.871 : 3.129 



1912 



1913 



146 481 



0.931 : 3.069 



+ 0.129 



+ 0.069 



18 I 87 : 0.686 : 3.314 ' =F 0.314 



69 291 



0.767 : 3.233 



+ 0.233 



9 39 



0.750 : 3.250 



=F 0.250 



14 44 



0.966 : 3.034 



=F 0.034 



34 130 0.829 : 3.171 



+ 0.171 



A 1912 113 I 493 0.745 : 3.255 1 =F 0.255 



Total 800 3106 1 0.819:3.181 , +0.181 



In the second and third vertical column the number of white- and 

 of blue-flowering plants in each culture is given. It is seen from 

 this, that the proportion of these two deviates more or less from 

 the ratio 1:3. In order to make clear the extent of the deviation 

 the ratio for each culture is reckoned per four individuals. The figu- 

 res obtained are given in the fourth column and in that following 

 it the deviations of these from the iheorelical latio 1 : o. 



1ji the second [)lace, the table shows that the deviaiiou in all 

 cases is in the same direction. The number of while-flowerinu- plants 



t)7 

 Proceediugs Royal Acad AiiiSleiuuui. Vol. XVI 



