Total : 495.25 : 374.00.

The average height of the six crossed plants is 82.54 inches, and that
of the six self-fertilised plants 62.33 inches, or as 100 to 75. Every
crossed plant exceeded its antagonist in height. In Pot 1 the middle
plant on the crossed side was slightly injured whilst young by a blow,
and was for a time beaten by its opponent, but ultimately recovered the
usual superiority. The crossed plants produced spontaneously a vast
number more capsules than did the self-fertilised plants; and the
capsules of the former contained on an average 3.37 seeds, whilst those
of the latter contained only 3.0 per capsule, or as 100 to 89. But
looking only to the artificially fertilised capsules, those on the
crossed plants again crossed contained on an average 4.46 seeds, whilst
those on the self-fertilised plants again self-fertilised contained 4.77
seeds; so that the self-fertilised capsules were the more fertile of the
two, and of this unusual fact I can offer no explanation.

CROSSED AND SELF-FERTILISED PLANTS OF THE SIXTH GENERATION.

These were raised in the usual manner, with the following result. I
should state that there were originally eight plants on each side; but
as two of the self-fertilised became extremely unhealthy and never grew
to near their full height, these as well as their opponents have been
struck out of the list. If they had been retained, they would have made
the average height of the crossed plants unfairly greater than that of
the self-fertilised. I have acted in the same manner in a few other
instances, when one of a pair plainly became very unhealthy.

TABLE 2/7. Ipomoea purpurea (Sixth Generation).