Mercury in Zodiac Signs

A representation of Hermes/Mercury, c.1465, showing the god with his attributes, including the caduceus. (British Museum)
A representation of Hermes/Mercury, c.1465, showing the god with his attributes, including the caduceus. (British Museum)

Mercury in Aries, makes the native quick, fiery, impulsive, antagonistic or contentious, addicted to disputes, good in an argument as far as continuity is concerned. If Mercury is in strong aspect to Mars, he or she will be addicted to falsehood or great exaggeration, quick in anger, fluent in speech. 

Meanings of the Planets in the Solar Houses

The three-level world of astrology: the twelve mundane houses surround the twelve Zodiac signs and the seven planets, with the earth at the centre. The entire system is shown to be under God's control. The British Library, C.54.c.9.
The three-level world of astrology: the twelve mundane houses surround the twelve Zodiac signs and the seven planets, with the earth at the centre. The entire system is shown to be under God’s control.
The British Library, C.54.c.9.

The student understands clearly that the position of the Houses never varies; House I. always occupying the space devoted to the Zodiacal Sign Aries in our original design of the Zodiacal Circle, while the Zodiacal Sign of Nativity must be placed in this House I. in each particular case.