The present work is based on the study of the laticiferous system in Hevea. It therefore covers anatomical, histological, and cytological research on laticifers and latex, together with biochemical and enzymological investigation of latex in vitro. Integration of all these studies led to the investigation of the physiology of the laticiferous function. The work described includes the most important results obtained over a period of nearly a century and the most recent work which has yet to be published.