Antirrhinum Ma jus Striatum. 13 



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I have exhibited on the opposite page the whole ex- 

 periment in the form of a pedigree. 



The result of our experiment can be given in yet 

 another form. The intensity of inheritance in the finely 

 striped spikes in successive generations produced by self- 

 fertilization was always about 95-98%. The intensity 

 of the inheritance of the red character in the various 

 subdivisions of the experiment was as follows : 



1. For seed variants 76% 



2. For bud variants 71% 



3. For the offspring of bud variants . . 8i% 



Average 77 % 



Finally I have endeavored to investigate the mode 

 of inheritance in the case of sectorial variation ; that is, 

 of spikes which on one lateral part bear striped flowers 

 and on the others red ones. It is obvious that this phe- 

 nomenon may be due to two entirely different causes. 

 First the red flowers may be genuine bud-variants and, 

 in such cases, they will presumably exhibit an intensity 

 of inheritance which corresponds with that found for 

 the bud-variants dealt with above. But it may also hap- 

 pen that on a very coarsely striped spike some of the 

 flowers may possess this striping in so extreme a degree 

 that they appear uniformly red. In this case their mode 

 of inheritance will presumably not differ from that of the 

 remaining flowers on the same spike. 



The latter was the case in the only experiment which 

 I have so far had the opportunity of making. In the 

 summer of 1898 I employed for this purpose a broadly 

 striped plant from the crop referred to on page 128. One 

 side of its terminal spike bore red and the other striped 

 flowers. There were 8 of the former and 7 of the latter. 



I enclosed the whole branch, before it flowered, in 



