Fig. 4. Nematode. 



a. Very young, normal root, h. mature, normal root, d, young root same age, 

 c. attacked by nematodes, d. same, one week later, e. section of mature gall, 

 showing distortion of tissue, f-u. the various stages of development of the young 

 embryo worm, beginning with /, as the egg and ending with u as the mature 

 worm ready to hatch (o-« after G. E. Stone and R. E. Smith). 



