Table 5/63.  Bartonia aurea.

Heights of plants measured in inches.

Column 1:  Number (Name) of Pot.

Column 2:  Crossed Plants.

Column 3:  Self-fertilised Plants.

Pot 1 :  31 :  37.

Pot 2 :  18 4/8 :  20 4/8.

Pot 3 :  19 4/8 :  40 4/8.

Pot 4 :  25 :  35. 
Pot 4 :  36 :  15 4/8.

Pot 5 :  31 :  18. 
Pot 5 :  16 :  11 4/8.

Pot 6 :  20 :  32 4/8.

Total :  197.0 :  210.5.

The average height of the eight crossed plants is 24.62, and that of the eight self-fertilised 26.31 inches; or as 100 to 107.  So that the self-fertilised had a decided advantage over the crossed.  But the plants from some cause never grew well, and finally became so unhealthy that only three crossed and three self-fertilised plants survived to set any capsules, and these were few in number.  The two lots seemed to be about equally unproductive.

17.  Passifloraceae.—­Passiflora gracilis.

This annual species produces spontaneously numerous fruits when insects are excluded, and behaves in this respect very differently from most of the other species in the genus, which are extremely sterile unless fertilised with pollen from a distinct plant. (5/17.  ’Variation of Animals and Plants under Domestication’ chapter 17 2nd edition volume 2 page 118.) Fourteen fruits from crossed flowers contained on an average 24.14 seeds.  Fourteen fruits (two poor ones being rejected), spontaneously self-fertilised under a net, contained on an average 20.58 seeds per fruit; or as 100 to 85.  These seeds were sown on the opposite sides of three pots, but only two pairs came up at the same time; and therefore a fair judgment cannot be formed.

Table 5/64.  Passiflora gracilis.

Heights of plants measured in inches.

Column 1:  Number (Name) of Pot.

Column 2:  Crossed Plants.

Column 3:  Self-fertilised Plants.

Pot 1 :  56 :  38.

Pot 2 :  42 :  64.

Total :  98 :  102.

The mean of the two crossed is 49 inches, and that of the two self-fertilised 51 inches; or as 100 to 104.

18.  Umbelliferae.—­Apium petroselinum.

The Umbelliferae are proterandrous, and can hardly fail to be cross-fertilised by the many flies and small Hymenoptera which visit the flowers. (5/18.  Hermann Muller ‘Befruchtung’ etc. page 96.  According to M. Mustel as stated by Godron ‘De l’espèce’ tome 2 page 58 1859, varieties of the carrot growing near each other readily intercross.) A plant of the common parsley was covered by a net, and it apparently produced as many and as fine spontaneously self-fertilised fruits or seeds as the adjoining uncovered plants.  The flowers on the latter were visited by so many insects that they must have received pollen from one another.