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The Difference between Lead and Mercury

The spirit within the mind is called the original nature of mercury. The generative essence in the mind is called the fluid of mercury. The original nature of mercury is gathered in the Yellow Pavilion, and the fluid of mercury is accumulated in the Purple Pavilion. They are the mercuric dragon and the true mercury. Together they are referred to as the internal pill, the yin pill, and the post-celestial half-pound son.

The vapor in the body is the essence of lead. The generative energy in the body is the splendor of lead. The essence of lead is obtained from the palace of kan, and the splendor of lead is gathered in the house of dui. They are called the lead tiger and the true lead. Together they are referred to as the external pill, the yang pill, and the pre-celestial eight-ounce mother.