[27]

Celery Heliotropism of Hypocotyl obscure light, Sept 14.

Window Blinds down. + muslin Curtain covered at top & on sides— open to room, Bright morning.

Left Hand Right Hand

[data not transcribed]

[27v]

are well illustrated by the plants called [cleistogene] which bear on the same stock two kinds of flowers. The flowers of the one kind are minute and completely closed, so that they cannot possibly be crossed; but they are abundantly fertile, although producing an extremely small amount quantity of pollen. The flowers of the other kind produce much pollen and are open; and these can be and often are cross-fertilised. Herman Müller has also made the remarkable discovery that there are some species plants which exist

[Cross and self fertilisation, pp. 3-4: "These remarks are well illustrated by the plants called cleistogene, which bear on the same stock two kinds of flowers. The flowers of the one kind are minute and completely closed, so that they cannot possibly be crossed; but they are abundantly fertile, although producing an extremely small quantity of pollen. The flowers of the other kind produce much pollen and are open; and these can be, and often are, cross-fertilised. Hermann Müller has also made the remarkable discovery that there are some plants which exist under two forms; that is, produce on distinct stocks two kinds of hermaphrodite flowers."]