Giants and dwarfs. Figs and ivy. Leaves of
seedlings.
E. MUTATIONS.
XVI. Origin of the peloric toad-flax. 459
Sudden and frequent origin in the wild state. Origin in the
experiment-garden. Law of repeated mutations. Probable origin of
other pelories.
[xv]
XVII. The production of double flowers. 488
Sudden appearance of double flowers in horticulture. Historical
evidence. Experimental origin of _Chrysanthemum segetum plenum_.
Dependency upon nourishment. Petalody of stamens.
XVIII New species of _Oenothera_. 516
Mutations of _Oenothera lamarckiana_ in the wild state near
Hilversum. New varieties of _O. laevifolia_, _O. brevistylis_, and
_O. nanella_. New elementary species, _O. gigas_, _O. rubrinervis_,
_albida_, and _oblonga_. _O. lata_, a pistillate form.
Inconstancy of _O. scintillans_.
XIX. Experimental pedigree-cultures. 547
Pedigree of the mutative products of _Oenothera lamarckiana_ in
the Botanical Garden at Amsterdam. Laws of mutability. Sudden and
repeated leaps from an unchanging main strain. Constancy of the new
forms. Mutations in all directions.
XX. Origin of wild species and varieties. 576
Problems to solve.
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