]
CHAPTER IV.
CRUCIFERAE, PAPAVERACEAE, RESEDACEAE, ETC.
Brassica oleracea, crossed and self-fertilised plants.
Great effect of a cross with a fresh stock on the weight of the
offspring.
Iberis umbellata.
Papaver vagum.
Eschscholtzia californica, seedlings from a cross with a fresh stock not
more vigorous, but more fertile than the self-fertilised seedlings.
Reseda lutea and odorata, many individuals sterile with their own pollen.
Viola tricolor, wonderful effects of a cross.
Adonis aestivalis.
Delphinium consolida.
Viscaria oculata, crossed plants hardly taller, but more fertile than
the self-fertilised.
Dianthus caryophyllus, crossed and self-fertilised plants compared for
four generations.
Great effects of a cross with a fresh stock.
Uniform colour of the flowers on the self-fertilised plants.
Hibiscus africanus.
[6. CRUCIFERAE.--Brassica oleracea.
VAR. CATTELL'S EARLY BARNES CABBAGE.
The flowers of the common cabbage are adapted, as shown by H. Muller,
for cross-fertilisation, and should this fail, for self-fertilisation.
(4/1. 'Die Befruchtung' etc. page 139.) It is well known that the
varieties are crossed so largely by insects, that it is impossible to
raise pure kinds in the same garden, if more than one kind is in flower
at the same time. Cabbages, in one respect, were not well fitted for my
experiments, as, after they had formed heads, they were often difficult
to measure.
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