(2)Song,Jin,Yuan Dynasty: "Four Great Physicians in the Jin and Yuan Dynasties”: Liu Wansu (Liu Hejian):"school of cold medicine" “Six climatic factors may all turn into fire..” “Extreme emotions can produce fire.” Zhang Congzheng (Zhang Zihe):"school of attack and purgation” "The occurrence of a disease was due to invasion of the body by an evil."(2)Song, Jin, Yuan Dynasty: “Four Great Physicians in the Jin and Yuan Dynasties”: Liu Wansu (Liu Hejian): “school of cold medicine” “Six climatic factors may all turn into fire.” “Extreme emotions can produce fire.” Zhang Congzheng (Zhang Zihe): “school of attack and purgation” “The occurrence of a disease was due to invasion of the body by an evil