The tallest
crossed plant in Pot 1 was 7 inches, and the tallest self-fertilised
plant on the opposite side 8 inches; in Pots 2 and 3 the tallest crossed
were 4 1/2 and 5 1/2, and the tallest self-fertilised 7 and 6 1/2 inches
in height; so that the average height of the tallest plants in the two
lots was as 100 for the crossed to 126 for the self-fertilised; and thus
we have a complete reversal of what occurred in the four previous
generations. Nevertheless, in all three pots the crossed plants retained
their habit of flowering before the self-fertilised. The plants were
unhealthy from being crowded and from the extreme heat of the season,
and were in consequence more or less sterile; but the crossed plants
were somewhat less sterile than the self-fertilised plants.
CROSSED AND SELF-FERTILISED PLANTS OF THE SIXTH GENERATION.
Seeds from plants of the fifth generation crossed and self-fertilised in
the usual manner were sown on opposite sides of several pots. On the
self-fertilised side every single plant belonged to the tall white
variety. On the crossed side some plants belonged to this variety, but
the greater number approached in character to the old and shorter kinds
with smaller yellowish flowers blotched with coppery brown. When the
plants on both sides were from 2 to 3 inches in height they were equal,
but when fully grown the self-fertilised were decidedly the tallest and
finest plants, but, from want of time, they were not actually measured.
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