The house containing Mercury shows the area of life and the manner in which mental powers are expressed.

Mercury in Aries and Scorpio: Indulgent habits, argumentative, intellectual, opinionated, deceitful and dishonest.
Mercury in Taurus and Libra: Persuasiveness, oratorial skills, family-minded, capable of earning money, generous, enjoys learning.
Mercury in Gemini (Rulership): Proud, scientific-minded, skilled in the arts,persuasive, strong speaking quality, financially comfortable.
Mercury in Cancer: Strong-minded, good memory, easily antagonizes people, earns money through water connected fields.
Mercury in Leo: Opinionated, strong personality, financial ups and downs.
Mercury in Virgo (Rulership, Exaltation)  Generous, well educated, strong values, comfortable, patient, brilliant mind.
Mercury in Sagittarius: Respected by people in authority, scientific-minded, interested in the law.
Mercury in Capricorn and Aquarius: Prefers to work for others, financial ups and downs, may incur debts, difficulties with money, talent for sculpture, does volunteer work.
Mercury in Pisces (Fall): Makes friends easily, open to others’ views, lacks confidence, skillful in crafts, nervous, irritable.