Oriental Materia...
From time to time for the past 2000 years. Chinese scholars have compiled botanical registers known as pen tsao, listing the varieties and applications of medicinal herbs in current use. The herbs so listed have grown in number from 365 (Han dynasty, A.D. 25) to 1894 (Ming dynasty, 1590), although the number in relatively common use today is considerably less than 1000. In the true spir...