Budh Yantra should be installed and worshipped to neutralize and appease planet Mercury. The planet Mercury is the Lord of zodiac signs Gemini & Virgo. It is regarded as Prince in the solar system. Mercury is the closest planet to Sun and it is a Natural Benefactor of Business & Speech. It is EXALTED in sign Virgo and DEBILITATED in sign Pisces. The planet Mercury manifests Education, Intelligence, Business, Friends, Speech, Mathematics, Salesmanship, Brokerage, Journalism, Banking, Skin, Astrology, Lawyer, Publishers, & Writers. Whenever planet Mercury is placed in its own sign or in its EXALTATION sign, in the 1st, 4th, 7th or 10th house of the horoscope, it generates a very good Yoga known as Bhadra Panch Mahapurush Yoga which makes a person very intelligent and long lived. A person having a weak or malefic Mercury has to suffer from diseases of Nerves, Brain, Nervous Breakdown, Skin Diseases, Speech defects like Stammering, Insomnia and Sexual Weakness like Impotency. In all such cases, the person should establish a Budh Yantra to nullify the malefic effects of planet Mercury.