XX11 EXPLANATION OF THE PLATES. 



a Cells of the epidermis. b Cells under them pressed together. 



c Common cellular tissue. At * is seen a small forked fibre, and four small 

 bodies, the presumed commencement of the fungus. (Plate in., fig. 18.) 



3. Horizontal section of the cellular tissue, in which the cells 

 are partly torn. (Plate in., fig. 19.) ^ 



4. Section of a fungoid excrescence from top to bottom. 



o Healthy. ft Diseased cell. c Epidermis. 



d Exhausted cellular tissue, which serves as a matrix for the fungoid growth. 

 e The fungus surrounded and entangled by cellular tissue raised at /. (Plate 

 in., fig. 22.) 



5. A very young fungus, growth intersected by grains of Pro- 

 tomyces strongly magnified. (Plate HI., fig. 23.) 



6. Vertical section of an excrescence of which the fungus is 

 fully developed. 



b Decayed cellular tissue under the epidermis. 



c, d Empty cellular tissue, serving as the foundation for the fungus. 



e Part of the cellular tissue. 



/ A dense mass of upright flakes of Fusisporium solani. (Plate m., fig. 25.) 



7. Separate portions of fungus highly magnified. (Plate m., 

 fig. 26.) 



8 and 9. Fusisporium solani at a more advanced stage with 

 seed grains fully developed. (Plate HI., figs. 27, 28.) 



10. A ripe seed grain more strongly magnified. (Plate m., 

 fig. 29.) 



11. A single fungous fibre with its seed grain, showing its 

 changes after being moistened with vitriolic acid. (Plate in., 

 fig. 30.) 



PLATE VII. 



FIG. 1. Section of a diseased carrot, showing the manner in 

 which it rots in consequence of the disease. (Natural size.) 



2. Section of diseased turnip in the first stage of the disease, 

 showing that the malady evinces itself principally between the 

 spiral vessels and bark. (Natural size.) 



3. Section of a potatoe in the first stage of gangrene, showing 



