[418]

Vicia faba

Dec. 31 & Jan 1'

Bean Radicle Circumnutation of, fr 8° 30' a.m. Dec 31' to to 10° 35 P.m do.

(Fig. 14 1/2 scale)

(Reduced to 1/2 scale no lettering)

[418v]

Movement & Circumnutation of the radicle

Kept in darkness, traced on Hor. glass in darkness. during 14 hours. Trace movement of end of filament magnified 23 times here Reduce to 1/2 scale

[419v]

54 610

Ch 9

, in ten of the cases or exactly one half, many of the self-fertilised seeds germinated before the crossed, & in the other half many of the crossed before the self-fertilised. In 4 four out of these twenty cases, seed derived from a cross with a fresh stock were compared with self-fertilised seeds from one of the later self-fertilised generations; & here again in half the cases the crossed seeds, & in the other half the self-fertilised seeds, germinated first; yet the seedlings of Mimulus raised from such self-fertilised seeds were extremely inferior in all respects to the crossed seedlings, & in the case of Eschscholtzia they were inferior in fertility. Unfortunately the relative weight of the two lots of seeds was ascertained in only a few instances; but with Ipomoea & I believe with some of the other species, the relative lightness of the self-fertilised seeds seemed to determine their early germination, probably owing to the less amount of matter having to undergo

[Cross and self fertilisation, pp. 354-5: "Neglecting one case in which the two lots germinated simultaneously, in ten cases or exactly one-half many of the self-fertilised seeds germinated before the crossed, and in the other half many of the crossed before the self-fertilised. In four out of these twenty cases, seeds derived from a cross with a fresh stock were compared with self-fertilised seeds from one of the later self-fertilised generations; and here again in half the cases the crossed seeds, and in the other half the self-fertilised seeds, germinated first. Yet the seedlings of Mimulus raised from such self-fertilised seeds were inferior in all respects to the crossed seedlings, and in the case of Eschscholtzia they were inferior in fertility. Unfortunately the relative weight of the two lots of seeds was ascertained in only a few instances in which their germination was observed; but with Ipomoea and I believe with some of the other species, the relative lightness of the self-fertilised seeds apparently determined their early germination, probably owing to the smaller mass being favourable to the more rapid completion of the chemical and morphological changes necessary for germination."]