It is true that genius is transmitted through heredity, and develops at every step, but it is sometimes found that the child of a very great person happens to be most ordinary; sometimes the child of a most worthy person proves to be most unworthy. This may be explained in this manner, that every genius has its three courses, uruj, kemal, and zawal, ascent, perfection, and descent. When the genius is ascending in the ascendent it develops progressively, when it is in perfection it surpasses all the former geniuses in that family, if it is in the decline it shows gradually or suddenly the lack or loss of genius. It is so with families, nations, and races.