Bui. 842, U. S. Dept. of Agriculture. 
Plate IV. 
P "e|| § 1 
Normal Kernels of Wheat with Nematode Galls and Oejects 
for which the latter have been mistaken. 
Fig. 1 (above).— A, Normal kernels of wheat; B, dark, smooth nematode galls; C, 
black papillate seeds of cockle; D, smutted wheat grains (smut balls); and E, 
bin-burnt kernels. Compare the sound wheat with the nematode galls and note 
the pronounced difference between the latter and the cockle seed, smutted grams, 
and the bin-burnt kernels for which the nematode galls are often mistaken. 
Twice natural size. Fig. 2 (below).— A, Unstained, thick cross section of a 
normal wheat kernel; B, cross section of a flower gall filled with a white mass of 
nematodes, for comparison as to shape, size, and content. X 6. 
