124 The South African Mulberry Blight 



(5) Macchiati, L. Lo Streptococcus bombyces e la flaccidezza, del baco da seta 



(Stazione sperim. Italiane, vol. xxni, 1892). 



(6) Macchiati, L. Ancora sui microbi della flaccidezza dei bachi da seta (Bull. 



Soc. Bof. Hal. 189G, p. 292). 



(7) Peglion, Vittorio. Bacteriosi delgelso (Centralblattfiir Bait. 2 Abt. in, 1897). 



(8) Smith, Erwin F. Bacterial blight of the Mulberry (Science, N.S. vol. xxxi, 



No. 803, pp. 792-796, 1910). 



(9) Smith, Erwin F. Identity of the American and French mulberry blight 



(Phytopathology, iv, No. 1, 34, Feb. 1914). 

 (10) Voglino, P. Riecerche intorno alle macchie nere delle foglie del gelso ed 

 alia flaccidezza del baco da seta (Coltivatore, Anno xi, No. 39, 1894). 



EXPLANATION OF PLATES. 



PLATE XIX. 



Fig. A. Photograph of mulberry leaf two months after inoculation with Bacterium mori. 

 The diseased tissues have fallen away, leaving the leaf in a ragged condition. 



Fig. B. Leaf five days after inoculation, showing a number of small spots in the water- 

 soaked stage. 



PLATE XX. 



Fig. A. Leaves two months after inoculation, showing distortion due to the disease. 

 Fig. B. Twigs of Morus nigra; the terminal parts of the branches have been killed 



by the blight. 



PLATE XXI. 

 Figs. A and B. Two photographs of a twig of the common mulberry, showing a number 



of dark, sunken spots due to infection with B. mori. The larger infection at the base 



of the twig was the result of a needle prick. 



PLATE XXII. 

 Section through water-soaked spot on leaf of Morus nigra. Drawn with Edinger's pro- 

 jection apparatus. 



PLATE XXIII. 



Section through water-soaked spot on a leaf of the common mulberry, fixed five days 

 after inoculation. Drawn with Edinger's projection apparatus. In Plates XXII and 

 XXIII and XXIV 15 the dots or small strokes are only intended to represent the 

 position of the bacteria, and in no way indicate the comparative size of the rods. 



PLATE XXIV. 

 Fig. A. Rods from a 24-hour old culture on nutrient agar, treated with Ellis's modifi- 

 cation of Loefllcr's flagella stain. Drawn wit It the aid of the camera lucida, a Zeiss 

 1/12 imm. objective and compensating ocular No. 12. 

 ! '.. Bacteria in the intercellular spaces; detail from Plate XXIII. 



