EXPLANATION OF THE FIGURES ON PLATE VIII AND IX. 



Fig. 1. Attacked branch, of which the bark bas been 

 eut off superficially at the place where the di- 

 seased tissue (a) passes into the healthy tissue (b). 



„ 2. Transverse section of a diseased branch. The 

 dark sector is the part killed by the fungus. 



„ 3. Cacoa pod on which, in a moist chamber, the 

 grey hairy pycnidia of Diplodia hâve developed. 



„ 4. Cacoa fruit which was hung up in the laboratory 

 after infection, and is now partially covered 

 with the black spores of Diplodia. 



„ 5. Pycnidia of Diplodia from pure cultures. 

 5a magnification 3 X. 

 56 „ 10 X. 



„ 6. Section through a pycnidium grown in pure 

 culture. Magnification 25 X. 



„ 7. Spores of Diplodia. Magnification 375 X. 



„ 8. Hairy pycnidium of Diplodia in the pericarp of 

 a cacoa fruit, formed in a damp atmosphère 

 a = wall of the pycnidium; b = pericarp ofthe 

 cacoa fruit. Magnification 115 X. 



„ 9. Pycnidium with glabrous neck, formed on the 

 pericarp in a non-enclosed space. Magnification 

 115 X. 



„ 10. Diseased branch, which bas been in a non-enclo- 

 sed space. From the fissures in the bark, beneath 

 which are pycnidia, unripe spores protrude, 

 still hanging together in tendrils X. Magnifica- 

 tion 20 X. 



