LLOYD 



PLATE 41 



I, 2. Cortex, stem of field plant with maximum rubber content. 



3. Cortex of a 20-year-old stem. 



4. Root; rapidly grown seedling, two months old. Rubber in granules. 



5. Rubber in process of accumulation in an irrigated plant. 



6. Primary resin canal, root I mm. diam. 



