——, struggle between, [75].
——, domestic, extinction of, [111].
——, transitional, rarity of, [172].
——, when crossed, fertile, [268].
——, when crossed, sterile, [269].
——, classification of, [423].
Verbascum, sterility of, [251].
——, varieties of, crossed, [271].
Verneuil, M. de, on the succession of species, [325].
Viola tricolor, [73].