_Capsella heegeri_. _Oenothera biennis cruciata_.
_Epilobium hirsutum cruciatum_. _Hibiscus Moscheutos_. Purple beech.
Monophyllous strawberries. Chances of success with new mutations.
XXI. Mutations in horticulture. 604
_Chelidonium majus lacinatum_. Dwarf and spineless varieties.
Laciniate leaves. Monophyllous and broom-like varieties. [xvi] Purple
leaves. _Celosia_. Italian poplar. Cactus dahlia. Mutative origin of
_Dahlia fistulosa_, and _Geranium praetense_ in the experiment-garden.
XXII. Systematic atavism. 630
Reappearance of ancestral characters. _Primula acaulis umbellata_.
Bracts of crucifers. _Zea Mays cryptosperma_. Equisetum, _Dipsacus
sylvestris torsus_. Tomatoes.
XXIII. Taxonomic anomalies. 658
Specific characters occurring in other cases as casual
anomalies. _Papaver bracteatum monopetalum_. _Desmodium gyrans_ and
monophyllous varieties. Peltate leaves and ascidia. Flowers on
leaves. Leaves. _Hordeum trifurcatum_.
XXIV. Hypothesis of periodical mutations. 686
Discovering mutable strains. Periods of mutability and constancy.
Periods of mutations. Genealogical trees. Limited life-time of the
organic kingdom.
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