PLATE 4 
A. —Photomicrograph from a longitudinal section of a leaf sheath from a rosette- 
diseased Harvest Queen wheat plant. Material killed and fixed in weak chrome- 
acetic fluid and stained with Heidenhain’s iron-alum haematoxylin. The intra¬ 
cellular bodies are marked x; all other bodies are nuclei. X 556. 
B. —Photomicrograph from a longitudinal section of a tiller base from a rosette- 
diseased Harvest Queen wheat plant. Material killed, fixed, and stained same as 
A. Note the necrotic cells and their granular nature. X 556. 
