a fresh stock did not grow higher than the self-fertilised or
intercrossed plants, but produced a greater number of seed-capsules,
which contained a far larger average number of seeds.

COLOUR OF THE FLOWERS ON THE ABOVE THREE LOTS OF PLANTS.

The original mother-plant, from which the five successive
self-fertilised generations were raised, bore dingy purple flowers. At
no time was any selection practised, and the plants were subjected in
each generation to extremely uniform conditions. The result was, as in
some previous cases, that the flowers on all the self-fertilised plants,
both in the pots and open ground, were absolutely uniform in tint; this
being a dull, rather peculiar flesh colour. This uniformity was very
striking in the long row of plants growing in the open ground, and these
first attracted my attention. I did not notice in which generation the
original colour began to change and to become uniform, but I have every
reason to believe that the change was gradual. The flowers on the
intercrossed plants were mostly of the same tint, but not nearly so
uniform as those on the self-fertilised plants, and many of them were
pale, approaching almost to white. The flowers on the plants from the
cross with the purple-flowered Westerham stock were, as might have been
expected, much more purple and not nearly so uniform in tint. The
self-fertilised plants were also remarkably uniform in height, as judged
by the eye; the intercrossed less so, whilst the Westerham-crossed
plants varied much in height.

Nicotiana tabacum.

This plant offers a curious case. Out of six trials with crossed and
self-fertilised plants, belonging to three successive generations, in