Astrologers classify characters into three primary groups, representing stability, flexibility and incisiveness, or again, originality and independence, adaptability, and executiveness. These answer to the grouping of the planets in the several signs of the zodiac, namely, the Fixed, Common and Cardinal signs, otherwise known as the grave, circumflex and acute. These may be tabularized in the following manner— _Sign._ _Character._ _Faculty._ Aries, Libra, Incisive. Executiveness. Capricorn, Cancer. Cardinal or Acute. Taurus, Scorpio, Leo, Aquarius. Stable. Originality. Fixed or Grave. Gemini, Sagittary, Virgo, Pisces. Flexible. Adaptability. Common or Circumflex. From this grouping we know at once what is the predominant mould of character and hence what environment is most suitable for the exercise and expression of that character. And as applied to eugenics, we are able thereby to make selection of suitable partners in life, setting off the stability of the one by the flexibility of the other, and so on. Take, for instance, the man who shows a predominant flexibility of character, wide sympathies, versatility, prolixity and diffuseness. He is apt to become a dabbler, never thorough, and _aliquid in omnibus_. Obviously his ambitions need pointing, his faculties concentrating, and his natural powers conserving. Bring him into relations with a woman who has a majority of the planets in cardinal signs, and he will find one who can be of the greatest use to him in the shaping of character and the directing of his ambitions and powers. We might ring the changes and derive from these three types seven distinct characters, all mutually interdependent and capable of fulfilling some special function in the economy of life, but never wholly of service when working alone. It is from the interplay of human character in the ordinary course of life that the main purpose of human evolution is served. It has already been shown that the lunar sphere is the last of those through which the incarnating entity passes when it proceeds towards mundane existence. It has been shown also that the Moon exercises a most important influence in human generation. It is to the Moon, therefore, that we look for the final determination of that personal colouring which is the prime environment of the Soul. Accordingly we find that the Moon’s position in a horoscope of birth is of the greatest importance.