Twofold import of amphimixis--It conditions the continual changing of individuality--Analogy from game of cards--The germ-plasm is at once variable and persistent--The two roots of individual variation: germinal selection and new combinations of the ids--'Harmonious' adaptation conditions amphimixis--Difference between adaptation and mere variation--Is a 'direct' use of amphimixis to be insisted upon?--Ceaseless intervention of personal selection in the lineage of the germ-plasm--Far-reaching effects of personal selection--Fixing of the arrangements for amphimixis in the course of generations of species--Increase of the constancy of a character with its duration--Characters in the same species variable in different degrees--The upper and under surfaces of Kallima--Wild plants brought under cultivation do not at first vary--Amphimixis very ancient, therefore very firmly established--Does amphimixis bring about equalization (Hatschek, Haycraft, Quetelet)?--Galton's frequency curves--Ammon's free scope for variations--De Vries' asymetrical curves of frequency. We have already made ourselves familiar with the process which in unicellular organisms is called conjugation and in multicellular organisms fertilization, and we have seen that its most obvious significance lay in the fact that through it the germ-plasms of two individuals are united. Since, according to our view, this germ-plasm or idioplasm is the bearer of the hereditary tendencies of the organism concerned, the mingling or amphimixis of two germ-plasms brings together the hereditary tendencies of two individuals, and the organism whose development is derived from this mingled germ-plasm must therefore exhibit traits of both parents, and must to a certain extent be made up of the traits of both. This is one result attained by amphimixis.