咳嗽之症．必因感冒而成．盖皮毛者．肺之合也．先皮毛受邪气．邪气得从其合．则伤于肺．故令嗽也．乍暖脱衣．暴热遇风．汗出未干．遽尔戏水．致令伤风咳嗽．初得时面赤唇红．气粗发热．此是伤风．痰壅作嗽．嗽久．津液枯耗．肺经虚矣．肺为诸脏华盖．卧则开．坐则合．坐则稍宽．卧则气促．乃因攻肺下痰之过．名曰虚嗽．又当补脾土．而益肺气．运土入水．借土气以生金．则咳自愈．