[154]

same leaflet

July 4'

Trifolium subterraneum

[sketch] 6° 45 moved pot round & move nearer glass

8° 30 far down & little to left

10. 15 much up

10. 55 far up

11. 12 do

11. 30 same course

12 down considerably

12. 45 far down

1. 27 same course

2. 12 risen again.

3. 3 risen greatly (by fig 4th)

3. 30 do

4.° up & to right

4. 30 down again

5 a good way down

5. 26 up again

6 far up

6. 30 almost vertical dot by guess

5th. 6° 45'

8 30 down

9 15 up

Distance of tip 3 7/8

base of leaf 9. 4.7 inches to vertical glass

from red spot to highest point 5.6 inches

lowest ⎯ 5.18 inches [=] 10.78

(Length of Leaflet .68 of inch)

50° up

48° down

The distance between the tip of leaf in 2 extreme positions was 1.03 inches So that the tracing exaggerates about 10 1/2 times

[154v]

[calculations]

70 681

Chap. 1 10

of the plants own pollen. We should also bear in mind that pollen must be carried by the bees from flower to flower on the same large branching stem much more abundantly than from plant to plant; and in the case of species the flowers of which are in some degree dichogamous, those on the same large stem would be of different ages, and would thus be as ready for mutual fertilisation as the flowers on distinct plants, were it not for the prepotency of pollen from another variety.*

Several varieties of the radish (Raphanus sativa) which is moderately self-fertile when insects are excluded, were in flower at the same time in my garden. Seed was collected from one of them, and out of 22 seedlings thus raised only 12 were true to their kind.* (Duhamel, ( as quoted by Godron, De l'Especè. Tom. II. p. 50, makes an analogous statement with respect to this plant.)

The onion produces a large number of flowers,

[Cross and self fertilisation, pp. 393-4: "These cases show how largely pollen from a neighbouring variety of the cabbage effaces the action of the plant's own pollen. We should bear in mind that pollen must be carried by the bees from flower to flower on the same large branching stem much more abundantly than from plant to plant; and in the case of plants the flowers of which are in some degree dichogamous, those on the same stem would be of different ages, and would thus be as ready for mutual fertilisation as the flowers on distinct plants, were it not for the prepotency of pollen from another variety.*
Several varieties of the radish (Raphanus sativus), which is moderately self-fertile when insects are excluded, were in flower at the same time in my garden. Seed was collected from one of them, and out of twenty-two seedlings thus raised only twelve were true to their kind.†
* A writer in the 'Gardeners' Chronicle' (1855 page 730) says that he planted a bed of turnips (Brassica rapa) and of rape (B. napus) close together, and sowed the seeds of the former. The result was that scarcely one seedling was true to its kind, and several closely resembled rape.
† Duhamel as quoted by God-
The onion produces a large number of flowers, all crowded together into a large globular head, each flower having six stamens; so that the stigmas receive plenty of pollen from their own and the adjoining anthers."]