584 Messrs. W. Bateson and R. P. Gregory. [July 31, 
Lqual-styled x Long-styled. 
The yellow flush being recessive, F,; is here the normal non-flushed long 
style; 45 such plants were first raised, all long and without the flush. In the 
next year, 77 such plants were produced by similar matings. 
Such F, plants gave by self-fertilisation 183 long, non-flushed, 51 equal- 
styled, with the flush, the expectation being 3:1. Crossed with the pure 
recessive, they gave 93 long, non-flushed, 107 equal-styled, with the flush, 
numerical equality being expected. 
Lqual-styled x Short-styled. 
From such crosses, in which the short-styled parents were DR, 39 plants 
were raised, 19 long, 20 short, all without yellow flush. The pure short- 
styled plants raised in 1903, crossed with pure equal-styled plants, gave 41, 
all short-styled, without flush. 
Such F, plants on self-fertilisation gave 247 plants, viz, 147 short, non- 
flushed, 35 short, flushed, 44 long, without flush, 21 equal flushed, the 
expectation being 138°9, 46°3, 46°3, 15:4. 
Crossed with ordinary longs, the same F; plants gave 73 short, 76 long, all 
without flush, the expectation being equality. 
The same F, plants, crossed with the pure equal-styled, gave 59 short, non- 
flushed, 39 short, flushed, 32 long, non-flushed, 24 long, flushed. This result, 
showing in each class a great excess of shorts, instead of numerical equality, 
is quite unexplained. The numbers can scarcely be taken as chance 
departures from equality. The same plants, however, gave recognisably 
normal results in both their other sets of matings, and the segregation was 
evidently quite normal. On the whole, it seems more likely that the aberra- 
tion was due to accident, than that any novel phenomenon actually 
occurred in this case. 
II].—ABNORMAL CASES. 
With the exception just mentioned, all the cases hitherto dealt with gave 
fairly simple Mendelian results, but the entire series of crosses in which a 
certain short-styled plant (referred to as No. 6) was used showed a definite 
and consistent departure from normal expectation. No. 6 was a red thrum 
plant, obtained from a nurseryman, and we know nothing of its origin. By 
self-fertilisation it gave four shorts. Fertilised by a short-styled plant, which 
had been proved to be DR, it gave six shorts, three longs. No. 6 was used as 
male on both long- and equal-styled plants, giving 10, all short-styled ; but 
