On further breeding, a new and stranger thing happens, however. Because when such hybrids--plants bred of parents that had borne, respectively, "Dominant" and "Recessive" characteristics, but with the parental Dominant traits so overpowering the Recessive traits of the other parent that these latter are submerged and concealed--When these hybrids are crossed with other hybrids like themselves, both the Dominant and the Recessive traits of the original parents reappear in offspring. The tall hybrids resulting from the cross between Tall and Dwarf plants, when crossed with other tall hybrids of similar origin, produce both Tall and Dwarf plants. So with Colour, and with the other so-called "Contrasted Traits." It becomes evident, therefore, that although the Dominant traits of Tallness and Colour overpower in the growth and development of the second generation of plants, the Recessive traits of Dwarfness and Whiteness, these latter traits are _submerged_ only, and are neither impaired in their values, nor destroyed. In the third generation, under different conditions of mating, the original Recessive, and submerged, traits re-appear, and reveal themselves in offspring-plants as the Dwarfness or the Whiteness that had characterised their grandparents. Mendel assumed that such hybrid plants--offspring of a Dominant and of a Recessive parent--produce two varieties of sex-cells, or gametes, and that one order of cells contain the Dominant traits of the Dominant parent, while the other order contain the Recessive traits of the Recessive parent. But any individual sex-cell, or gamete, cannot (according to his view) bear both Dominant and Recessive traits. The Dominant traits and the Recessive traits of the respective parents he regarded as being segregated, absolutely, in one or in the other set of sex-cells produced by hybrid varieties. And of these, the cells bearing Dominant traits are able to transmit Dominant traits only to offspring; while the cells bearing Recessive traits transmit Recessive traits only to offspring. II Now, Biology shows that plants and living creatures develop from a single microscopic cell, formed by the union of two half-cells, of which each half was contributed by one of the two parents. Clearly then, a hybrid plant is one that has sprung from the union of two half-cells, one of which bore the Dominant traits of one parent, while the other bore the Recessive traits of the other parent. But because Dominant traits overpower Recessive traits in development, the cross between a tall plant and a dwarf plant produces tall offspring only--Tallness being a Dominant trait which overpowers the Recessive trait of Dwarfness. So too, the cross between a plant bearing coloured and a plant bearing white flowers produces offspring bearing coloured flowers only--Colour being Dominant over the Recessive Trait of Whiteness.