342 MR. А. W. SUTTON ON BRASSICA CROSSES, 
Group I11.—In this series of crosses abundant seed was produced, and 
plants of the F 1 and F 2 generation were easily raised. 
The seeds from the F 1 generation were sown and about 200 plants from 
them were grown for observation. In the second filial generation (F 2) 
segregation occurred in all cases. 
In order to obtain an impartial estimate of the numbers and characters of 
the plants, neither Professor Percival nor myself had anything to do with the 
classification of the segregated plants, this being left to the judgment of one 
of our assistants who had no inclination to look for Mendelian numbers. 
Many of the results, as will be seen below, are confirmatory of Mendel's 
laws. Where the figures appear to disagree with the well-known ratios 
among segregated plants of the F2 generation, it is possible that the dis- 
crepancy may be due to the great diffieulty in deciding into which group 
individual plants should be placed. 
d 9 
Ragged Jack Kale on White Swede. 
Ragged Jack Kale (Pl. 30. fig. 58) is a form of Brassica which in 
general habit and flower resembles a Colza Rape but the leaves are laciniate. 
The Swede used for the female parent was а white-fleshed variety with purple 
top (fig. 59). 
The plants of F1 had strong Swede-like leaves; they were however 
slightly more incised at the margins than the normal Swede parent, indicating 
the influence of the Ragged Jack parent. The rootstock was thick with little 
tendency to “ bulbing ” (fig. 60). 
The plants of the F 2 generation, of which 198 were grown, were of several 
forms. There were bulbing and non-bulbing plants, some having leaves like 
the Swede, others the laciniate form of the Ragged Jack Kale. 
The following were the classes into which the plants of this generation 
were divided together with numbers belonging to each class. 
As regards foliage there were found— 
142 with Swede foliage. 
98 , Ragged Jack foliage. 
18 , Intermediate foliage. 
From the Mendelian ratio of 3 to 1, where Swede is dominant, we should 
expect from 196 plants— 
147 with Swede foliage. 
49 , Ragged Jack foliage. 
Ав regards the bulbing character there were— 
Found (198 plants). Expected (from 196 plants). 
Bulbed — ......... 160 147 
Pulhless 38 49 
