Calculus Bovis is a precious Chinese medicine. According to legend, bezoar was discovered by Bian Que, an ancient doctor in China. One day, Bian Que was sorting out the wrought stone on the table. At this time, Bao Yang, a neighbor, killed a sick cow and found something like a sea of stones in the gallbladder of the cow. I don't know if it is an animal, so he came to Bian Que with his gallbladder. Bian Que cut open the gallbladder, took out two "stones" and put them on the table, pondering carefully. Bao Yang, who came home soon, came screaming and said that his father couldn't get up in one breath and kept twitching on the kang. Bian Que hurried to Bao Yang's home, only to see Bao Yang's old father roll his eyes and purr in his throat. Bian Que read the letter and immediately ordered Bao Yang to go to the table, grind the stone into powder and pour wine for Bao Yang's father. After a while, Bao Yang's father stopped twitching and his breathing calmed down. When Bian Que came home, he found two cows "stones" missing from the table. After careful searching, it turned out that Bao Yang mistook bezoar for a stone in his panic. Bian Que thought, "Does this kind of stone really have the effect of resolving phlegm and calming shock?" So the next day, I'm going to use it to charge and give it to Bao Yang's father. In a few days, my illness miraculously recovered. Bian Que called this dark yellow thing in the gallbladder "bezoar". Since then, the precious and magical traditional Chinese medicine "Niuhuang" was born, although it is easy for people to remember that Niuhuang is a three-point poison. I searched in the book for a long time. I hope to adopt. Thank you.