The text outlines the effects of Mercury being placed in the twelve houses of the birth chart. The general effects are as follows:

• Mercury in the First House: The native is likely to be intelligent, learned, and wealthy, with good communication skills.
• Mercury in the Second House: The person may have a pleasant voice, be financially prosperous, and knowledgeable, but also potentially deceitful.
• Mercury in the Third House: This placement suggests courage, strength, and potential for success in writing, publishing, or communication-related fields. The native may have many siblings.
• Mercury in the Fourth House: The person might enjoy domestic happiness, own vehicles and property, and be well-educated, but could also be prone to worry and anxiety.
• Mercury in the Fifth House: This position can indicate intelligence, good children, and success in education and speculation.
• Mercury in the Sixth House: The individual may face health challenges, debts, and enmity with others, but also possess strong analytical and problem-solving skills.
• Mercury in the Seventh House: This placement can suggest a happy marriage, a learned and intelligent spouse, and success in business partnerships.
• Mercury in the Eighth House: The person might have a sharp intellect, an interest in occult subjects, and potential for inheritance, but could also face health issues and a shorter lifespan.
• Mercury in the Ninth House: This position indicates good fortune, religious inclination, higher education, and a supportive father.
• Mercury in the Tenth House: The individual is likely to be successful in their career, particularly in fields related to communication, intellect, or business. They may attain a high social status.
• Mercury in the Eleventh House: This placement suggests financial gains, fulfillment of desires, and a large social circle.
• Mercury in the Twelfth House: The person might experience losses, expenditures, and separation from loved ones. They may also have a keen imagination and interest in spiritual matters.

The text emphasizes that these are general interpretations, and the actual effects of Mercury in a specific house will depend on various other factors in the birth chart, such as aspects from other planets.