VULGARIS L. AND IN PH. MULTIFLORUS WILLD..’ 111 





| | A À 
Family _ Brown | Wagenaar | Total | at = 
; | | a total of 4: 
Artif. hybr. F, 8 2 10 3.20 : 0.80 
1920. 763 Bey 33 9 42 | 3.14 : 0.86 
764 F, 38 10 48 | 3.17 : 0.83 
767 F, 61 26 87 2.80 : 1.20 
768 F; 33 12 45 | 2.93 : 1:07 
769 Be Maon 8 43 3 25 : 0.75 
1921. 1038. Spont. hybr. F* 32 10 42 1.04 : 0.96 
240 77 ott 3.02 : 0.98 




descendants (33 and 40) with one exception: a brownseeded plant, 
that was a new spontaneous hybrid. 
The numerical proportions allow concluding to a monohybrid 
nature of the F ,; a single dominant factor being present in the 
brown race, absent in the Wagenaar, and probably the same factor 
as that, mentioned in my previous paper as G, perhaps also the 
-same as KOOIMANs C. 
3. Cross CITROEN X BRUINE. 
In connection with the results, obtained in the two crosses above, 
the hybrid Citroen X Bruine was expected to be a dihybrid, segre- 
gating according to the scheme 12 brown: 3 wagenaar: | citroen, 
because of the epistasis, according to Kooiman, of his factor C (G) 
for brown seedcoat and brown navelring over the factor D, that 
causes a brown colour in the navelring only. Individuals with C 
alone could not be discerned phaenotypically from the CD-plants. 
The segregation observed however gave other numerical propor- 
tions: in some cases the F9 splitted in only two groups, viz. 3 
brown: 1 lemoncoloured, while in others the three phaenotypical 
groups appeared indeed, but in numbers that deviate strongly 
from the expected 12:3: 1-proportion. These two groups may be 
separated in tabular form: 
(Cf table page 112). 
The monohybrid character of this segregation is beyond doubt; 
the brown race used in these crosses possessed only one factor 
that was absent in the lemoncoloured Citroen-individuals. 
