Trifolium Pratcnsc Quinquc folium. 53 
year, and set seed in August. At this time I examined 
an equal number of leaves on the two halves and ob- 
tained the following result : 
Number of leaflets: 34567 
On garden soil: 12 25 34 20 18 
On sandy soil: 18 19 35 19 17 
The behavior of the two halves was identical ; the 
difference in the soil exerted no visible effect. Moreover 
the seeds on the two halves were of about the same size 
and produced in roughly equal numbers. The two sets 
were harvested separately and sown in the following 
spring (1894) in pans. When the young plants had about 
3 leaves they were examined. Calling a plant with a 
tetra- or a pentamerous leaf "abnormal" the result was : 
Seeds from garden soil 30% abnormal 
" sandy soil 24% 
The experiment involved 150 and 200 seedlings. The 
abnormal ones were further sorted according to the 
composition of their primary leaves. 
Leaflets 123 Totals 
Seeds from sandy soil 24 10 13 47 
41 garden soil 16 12 13 41 
Both counts therefore gave a difference in favor of 
the better nourished seeds. For further investigation 
I selected those which appeared most abnormal from 
both series, i. e., the seedlings with a trimerous primordial 
leaf, and planted them out under similar conditions. In 
July when each plant had twenty or more stems, I pulled 
them up, selecting for examination the ten best plants 
from each group; i. e., those ten, the leaves of which 
numbered about 100 per plant. The leaves were recorded 
separately for each individual, and as there happened to 
