ILLUSTRATIONS 



Plate. 



Page. 



Plate I. Pseudomonas; hyacinthi ( Wakker ) Erw. Sm 46 



Text figures. 



Fig. 1. Diseased scale of hyacintli ...,. 22 



2. Inoculated leaf of hyacinth ... 23 



3. Culture of Pseudomonas hyacinthi on slant 30 per cent cane-sugar 



agar, showing '• shagreen"' surface . ..._.. 38 



4. Slightly magnified diagrammatic views of slime of Ps. hyacinthi on 



sweet potato, showing ' ' shagreen '" surface 38 



5. Typical behavior of Ps. hijacinthi in fermentation tubes containing 



peptone water, or peptonized beef bouillon, with addition of vari- 

 ous sugars and other carbohydrates 41 



6. Ps. hyacinthi growing in strongly alkaline (0) gelatin with 10 per 



cent cane sugar. No liquefaction. The surface curves are due to 



the very gradual drying out of the gelatin 42 



8 



