67 



ber, and tomato, from badly infested soil. Fig. 5, young Hetero- 

 dera among the particles of a tine loam soil, X i75- Fig. 6, portion 

 of an angle worm contrasted in size with Heterodera, represented by 

 the two black lines near the center, the longer representing the length 

 of the mature male, the shorter that of the young worm. X lo- 



Plate VIII. Species of free living nematode. 



Plate IX. Various forms of nematodes; figs, i, 3, 4, 8, 5, free 

 living species. 



Plate X. Photograph showing the effect of nematodes on cucum- 

 bers grown in pots. The plants in the two middle pots have died. 

 The plants on each side are uninfected ones and of the same age as 

 the infected plants. 



Plate XI. Cucumber root showing galls. 



Plate XII. Tomato root showing galls. 



