Autores:
  • We all know that any thing which retards in any way the free circulation of the sap, also prevents to a certain extent the formation of wood and leaves.

    Robert Fortune (1847). “Three Years' Wanderings in the Northern Provinces of China: Including a Visit to the Tea, Silk, and Cotton Countries; with an Account of the Agriculture and Horticulture of the Chinese, New Plants, Etc”, p.85