87 
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EXPLANATION OF PLATES. 
Plate XV. 
Fig. 1. Specimen of diseased cabbage, after Woronin. Natural size. 
2. Specimen of diseased turnip root, after Sorauer. Natural size. 
3. Portion of transverse section of turnip. Natural size. 
4. Rootlet of cabbage showing condition seven weeks after infection. Natural 
size. 
5. Transverse section of rootlet along the line ab in which the spores are present, 
X 65. 
6. Portion of root of turnip seven weeks after infection. Natural size. 
6a. Cells from tranverse section along line ab Fig. 6, X 200. 
Plate XVI. 
Fig. 9. Vessel from axial portion. Section taken from along line ab, Fig. 10, x 600. 
10. Diseased rootlet of cabbage. Natural size. 
11. Swarm cell drawn at short intervals to show constant change in outlines. 
X 1,200. 
12. Ripe spores from some of which swarm cells are apparently escaping, x 1,200, 
13. Probably early stages of plasmodia, x 600. 
