Species and Varieties, Their Origin by Mutation by Vries, Hugo de, 1848-1935

VIII. Latent characters. 216 Leaves of seedlings, adventitious buds, systematic latency and retrogressive evolution. Degressive evolution. Latency of specific and varietal characters in wheat-ear carnation, in the green dahlias, in white campanulas and others. Systematic latency of flower colors.

IX. Crossing of species and varieties. 247 Balanced and unbalanced, or species and variety crosses. Constant hybrids of _Oenothera muricata_ and _O. biennis_. _Aegilops_, _Medicago_, brambles and other instances.

X. Mendel's law of balanced crosses. 276 Pairs of antagonistic characters, one active and one latent. _Papaver somniferum_. [xiv] _Mephisto Danebrog_. Mendel's laws. Unit- characters.

D. EVERSPORTING VARIETIES.

XI. Striped flowers. 309 _Antirrhinum majus luteum rubro-striatum_ with pedigree. Striped flowers, fruits and radishes. Double stocks.

XII. "Five leaved" clover. 340 Origin of this variety. Periodicity of the anomaly. Pedigree- cultures. Ascidia.

XIII. Polycephalic poppies. 369 Permanency and high variability. Sensitive period of the anomaly. Dependency on external conditions.

XIV. Monstrosities. 400 Inheritance of monstrosities. Half races and middle races. Hereditary value of atavists. Twisted stems and fasciations. Middle races of tricotyls and syncotyls. Selection by the hereditary percentage among the offspring.

XV. Double adaptations. 430 Analogy between double adaptations and anomalous middle races. _Polygonum amphibium_. Alpine plants. _Othonna crassifolia_. Leaves in sunshine and shadow. Giants and dwarfs. Figs and ivy. Leaves of seedlings.

E. MUTATIONS.