EXPLANATION OF THE PLATES. Xx 



PLATE V. 



VARIOUS SUBJECTS. 

 All the figures but fig. 4 are magnified. 



1. Empty cell, after Martius. 



a Light yellow grains of Protomyces. 

 b Fungous fibre commencing. 



2. Beautiful fungus found on under-ground stem. (Smee.} 



3. Botrytis, after Berkeley. 



4. Leaf, showing the manner in which it evinces the gangrene 

 and blotches. 



5. Starch granules, after Pereira, showing their external ap- 

 pearance. 



a Normal starch particles. 



b Irregular. 



c, d Particles, each having two hila. 



e, g Particles broken by pressure and water, the internal matter remains solid. 



6. Thrips munilissima, after a drawing from the " Gardener's 

 Chronicle." 



7. Eupteryx solani, after a drawing from the " Gardener's 

 Chronicle." 



8. Acarus farina, which is found abundantly on diseased po- 

 tatoes. 



9. Red Acarus, which preys upon Aphides. 



10. A species of Aphis which was noticed upon a potatoe plant. 



PLATE VI. 



FUNGI AND DISEASED STRUCTURE, AFTER MARTIUS. 

 All the figures are highly magnified. 



FIG. 1. A part of the epidermis of a white potatoe separated 

 by a horizontal cut. (Plate in., fig. 17.) 



2. Vertical section through the epidermis of a white potatoe 

 to the cells. 



