e 
THE VEGETATIVE ORGANS OF PLANTS. 247 
parts of the primary roots, e, and of the secondary roots, 
m, no longer retain the particles of soil; the hairs upon 
them being, in fact, dead and decomposed. The newer 
parts of the root alone are clothed with active hairs, and 
to these the soil is firmly attached as before. The next il- 
Fig. 42. 
lustration, fig. 42, exhibits the appearance of root-hairs 
with adhering particles of earth, when magnified 800 di- 
- ameters—<A, root-hairs of wheat-seedling like fig. 40; B, 
of oat-plant, both from loamy soil. Here is plainly seen 
the intimate attachment of the soil and root-hairs. The 
