夫疟,皆由伤暑及伤风所为,热盛之时,发汗吐下过度,腑脏空虚,荣卫伤损,邪气伏藏,所以引日不瘥,仍故休作也。夫疟岁岁发,至三岁发,连月发不解,胁下有痞,治之不得攻其痞,但得虚其津液。先其时发其汗,服汤已,先小寒者,引衣自温覆汗出,小便自引