42 



BOTANY. 



as it is placed in the stem) is a mass of sieve-tissue, com- 

 posed of latticed cells («, v, Fig. 25). Surrounding the 

 •whole is a thick mass of fibrous tissue composied of elon- 



Fio. 36.— Fibro-vaaoular bundle of Castor-oll Plant. i,t,g,g, tracheary tissue ; 

 y, y, sieve-tissue poorly developed; 6, b, bast-flbres; c, o, cambium-cells. High- 

 ly ma^niiied. 



gated, thick- walled cells (the shaded ones in the figure). 



81. In the Castor-oil Plant the limits of the fibro-vascular 

 bundles are so poorly marked that in places it is impossible 



