Antirrhinum Ma jus Striatiun. 133 
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 . .84% 
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 
