THE METABOLISM OF PLANTS. 



I6 7 



FIG. 23 (after Hanstein). Part of a sieve- tube (from the Hop) shewing a sieve- 

 plate. The central granular portion is the protoplasmic content of the tube ; 

 the shaded portion around this is the cell- wall swollen by treatment with 

 potash. The dark lines traversing the sieve-plate represent protoplasmic 

 filaments. 



FIG. 24 (after Dippel). A, Part of a laticiferous cell from Euphorbia splendens ; 

 in the latex the peculiar rod-shaped starch-granules are to be seen. 

 B y Laticiferous vessels from the root of Cichorium Intybus. 



The fluid contained in the laticiferous tissue is termed latex. It is a 

 watery fluid holding proteids, carbohydrates, and mineral matters in 

 solution. It is frequently milky in consequence of the presence of fats 





