166 Inheritance in the Stock (Matthiola incana) 



below will enable the successive steps in this operation to be readily 

 followed. 



CBH X CRK 



I 



CRHK 

 CR 



(some plants) CR x CRHiK (semi-incana) 

 CR CRHiK 



CRHxCRHiK 

 CRH I CR 



CRH CRH CRH CRH CRHiK 



CRHiK CRK . CR Selfx CRHx x CRH^K 



Hoary Hoary Glabrous I Glabrous I semi-incana 



CRH CRH CRHi CRH CRHiK x Self 



CRH CRHi CRHi CRHiK CRHi 



Hoary Mid-Hoary 



CRHi CRHiK CRHiK 



CRHi CRHi CRHiK 



Mid-hoary semi-incana 



With the new forms thus obtained it became possible to effect any 

 desired factorial combination, and from appearance of the resulting in- 

 dividuals (see the foregoing description and summarised statement set 

 out on p. 162) to group these combinations under the several grades 

 which have now been recognised. In the concluding Table the results 

 of various matings in which the factor Hi is involved are analysed in 

 detail. In every case it will be seen that there is close agreement 

 between the calculated and the observed results, and the whole body 

 of evidence furnishes sufficient proof of the view here taken of the inter- 

 factorial relations. Numerous confirmatory tests were carried out with 

 " extracted " individuals but as they add nothing to the knowledge 

 already gained it is unnecessary to include them here. It remains 

 briefly to summarise the conclusions drawn from these later experi- 

 ments and to consider their significance from a physiological aspect. 



Summary of Later Results. 



1. The type (incana) and its wholly glabrous variety are not 

 isolated terms, but the end terms of a series. 



2. In both of them the characteristic condition in regard to surface 

 character is exhibited at once in the seedling stage and continues at 

 the same level throughout the life of the plant. 



