2 ounces; and the
nineteen self-fertilised plants, 21.5 ounces. We have therefore for the
weights of the three lots of plants the following ratios:--
The English-crossed to the self-fertilised plants, as 100 to 118.
The English-crossed to the intercrossed plants, as 100 to 100.
The intercrossed to the self-fertilised plants, as 100 to 118.
We thus see that in weight, as in height, the self-fertilised plants had
a decided advantage over the English-crossed and intercrossed plants.
The remaining seeds of the three kinds, whether or not in a state of
germination, were sown in three long parallel rows in the open ground;
and here again the self-fertilised seedlings exceeded in height by
between 2 and 3 inches the seedlings in the two other rows, which were
of nearly equal heights. The three rows were left unprotected throughout
the winter, and all the plants were killed, with the exception of two of
the self-fertilised; so that as far as this little bit of evidence goes,
some of the self-fertilised plants were more hardy than any of the
crossed plants of either lot.
We thus see that the self-fertilised plants which were grown in the nine
pots were superior in height (as 116 to 100), and in weight (as 118 to
100), and apparently in hardiness, to the intercrossed plants derived
from a cross between the grandchildren of the Brazilian stock. The
superiority is here much more strongly marked than in the second trial
with the plants of the English stock, in which the self-fertilised were
to the crossed in height as 101 to 100.
Pages:
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183