THE TISSUES OF PLANTS. 



19 



Fio. 11. 



Fio. IS. 



Fio. 11.— Milk-tubes from a Spurge (Euphorbia). A, moderately magnifled; B 

 more higlily magnified, and showing the bone-shaped starch-grains. 



Fig. is. — Milk-vessels of a Composite (Scorzonera). A, a transverse section of 

 the root; B, the same more highly magnifled. 



walls (Fig. 11, £); in other plants they are thin-walled 

 and are sometimes inclined to anastomose. From their 



