238 Non-Isolable Races. 
of leaves counted on the plant (about 100). The numbers 
were therefore smaller in this than in the previous year. 
For this culture I had planted out the normal and ab- 
normal seedlings of the most abnormal seed-parents and 
some abnormal seedlings of the remaining seed-parents. 
No essential difference between these three groups could 
be detected when they were recorded at the time of flow- 
/ 
ering. 
Pitcher formation was observed both amongst the 
seedlings and during the later stages ; this is another 
indication of correlation amongst the various characters. 
In the summer of 1898, 41 of the selected plants fur- 
nished a sufficient quantity of seed. In the following 
spring I determined the proportions of seedlings with 
compound primary leaves in the crops from each of these 
parents and reckoned them in percentages. The compo- 
sition of the 1898 harvest with respect to this character 
was : 
Percentage of abnormal offspring 1 2 3 4 5 8 11 15 16 20 24 27 
Parents 3 12 75421211111 
That is to say, a considerable advance which at once 
becomes evident if this series of figures is compared with 
that given above for the 1897 harvest (1-4 and 6%). 
This advance has moreover taken place in spite of the 
falling off in the number of 4-foliate leaves in the seed- 
parents. 
In the spring of 1899 I only selected seedlings with 
trifoliate primary leaves for transplanting (see Fig. 47C), 
and only from amongst the offspring of the four seed- 
parents with from 15-24% abnormal offspring. At the 
time of flowering, however, my hopes were disappointed. 
In the middle of July there were amongst 120 richly 
branched flowering plants 45% without the anomaly, 
