It has already been shown by one of our Kabalas that there is a certain polarity existing between the planets of the system by which they become natural antitheses and thus stand in certain relations of polarity. Hence it is that the numbers attaching to them are interchangeable. Thus it was shown that Mars and the Moon, the one having its exaltation sign in Capricorn and the other its rulership in Cancer, the opposite sign, were numerical resolvants. Also that Mercury, having its exaltation sign in Aquarius, was resolved into terms of the Sun, whose rulership is vested in the opposite sign Leo. Further, that the Moon, having its exaltation in the sign Taurus, was interchangeable with Mars, whose sign is Scorpio, in opposition to Taurus. The scheme of Planetary Hours involved the whole of this question of Planetary Numbers, and it was shown that the matter was open to considerable controversy, necessitating prolonged observation and research. There is another point in connection with the interchange of Planetary Numbers which requires consideration. It is that of polarity. Astrologers everywhere recognize the fact that the signs of the zodiac are alternately active and passive, or positive and negative, male and female, and the Houses or twelve divisions of the visible heavens are said to have the same polarity as the signs with which they are associated, as Aries with the 1st House, Taurus with the 2nd House, and so on. Now, at a mean rate of motion, which is attained at the equinoxes, the apparent transit of the Sun through the Houses or divisions of the Prime Vertical is at the rate of 30°, or the space of one House in two hours. Therefore, if the Houses are to be regarded as having the same polarity as the signs they are associated with, then the first 30° of the Sun’s diurnal arc will be negative in action and the next positive, and so on alternately. But it has already been empirically proved that the quadrant from sunrise to noon is positive, that from noon to sunset negative, from sunset to midnight positive, and from midnight to sunrise negative. For a demonstration of this principle I refer my readers to “The Law of Sex” developed in my _Manual of Astrology_. This law requires that the majority of influence exerted from the S.E. quarter of the heavens, which extends from the Sun’s rising to its culmination, shall be positive and tending to male generation, while that from the S.W. quarter shall be negative and tending to female generation. But it can also be shown that the Planetary Hours, each of which occupies the time of the Sun’s passage through one-half of a House, or 15°, are alternately positive and negative. We then derive the following useful diagram of the [Illustration: Figure 20. Polarity of the Houses.]