Xūláo shīxuè jí yào 虛勞失血集要, a Qīng medical treatise on internal depletion and blood-loss by 蔡貽績 Cài Yíjī (Húnán); the second half of Cài’s projected diptych whose first half is 傷寒瘟疫抉要 Shānghán wēnyì jué yào (printed 1817). The Xūláo half remained in manuscript until a fresh subscription in 1823 enabled its printing combined with the first half as KR3eh051 Nèishāng jí yào.