the four tallest crossed plants averaged 7.62, and the four tallest self-fertilised 5.87 inches in height; or as 100 to 77.  Ten flowers on the crossed plants were fully expanded before one on the self-fertilised plants.  A few of these plants of both lots were transplanted into a large pot with plenty of good earth, and the self-fertilised plants, not now being subjected to severe competition, grew during the following year as tall as the crossed plants; but from a case which follows it is doubtful whether they would have long continued equal.  Some flowers on the crossed plants were crossed with pollen from another plant, and the capsules thus produced contained a rather greater weight of seed than those on the self-fertilised plants again self-fertilised.

Crossed and self-fertilised plants of the second generation.

Seeds from the foregoing plants, fertilised in the manner just stated, were sown on the opposite sides of a small pot (1) and came up crowded.  The four tallest crossed seedlings, at the time of flowering, averaged 8 inches in height, whilst the four tallest self-fertilised plants averaged only 4 inches.  Crossed seeds were sown by themselves in a second small pot, and self-fertilised seeds were sown by themselves in a third small pot so that there was no competition whatever between these two lots.  Nevertheless the crossed plants grew from 1 to 2 inches higher on an average than the self-fertilised.  Both lots looked equally vigorous, but the crossed plants flowered earlier and more profusely than the self-fertilised.  In Pot 1, in which the two lots competed with each other, the crossed plants flowered first and produced a large number of capsules, whilst the self-fertilised produced only nineteen.  The contents of twelve capsules from the crossed flowers on the crossed plants, and of twelve capsules from self-fertilised flowers on the self-fertilised plants, were placed in separate watch-glasses for comparison; and the crossed seeds seemed more numerous by half than the self-fertilised.

The plants on both sides of Pot 1, after they had seeded, were cut down and transplanted into a large pot with plenty of good earth, and on the following spring, when they had grown to a height of between 5 and 6 inches, the two lots were equal, as occurred in a similar experiment in the last generation.  But after some weeks the crossed plants exceeded the self-fertilised ones on the opposite side of the same pot, though not nearly to so great a degree as before, when they were subjected to very severe competition.

Crossed and self-fertilised plants of the third generation.