The earliest Chinese pharmacopoeia, The Divine Farmer’s Materia Medica, was compiled around 206 B.C. and contained 365 herbs. It was written by Shennong, who was credited with teaching China the practice of agriculture and with tasting hundreds of herbs to carefully test and record their therapeutic properties. Over the milleniums, Chinese physicians have written many new discoveries and classifications of herbs into the medical literature. From 206 B.C. to the present, many herbs were added to what is now known as the Chinese Materia Medica, or the book of Chinese herbal medicines. The current edition contains over 10,000 natural substances.