H. WORMALD 245 



44. WiNOGRADSKY, S. Sur ]e rouissage du lin et son agent microbien. Compt. 



Rend, des se. de VAcad. des sci. Tome cxxi, 1895, pp. 742-745. 



45. WoRMAi,D, H. Experiments with Rhizopus nigricans on Tomatoes. Jour. 



8. E. Agric. Coll, Wye, No. 21, 1912, pp. 381-391. 



46. A Bacterial Rot of Celery. Jour. Agric. Sci. Vol. vi, Pt. n. May, 



1914, pp. 203-219. 



47. A Heart Rot of Celery caused by Bacteria. Jour. S. E. Agric. Coll., 



Wye, No. 22, 1913, pp. 457-473 (or Reprint from the same, pp. 71-87). 



EXPLANATION OF PLATES I AND IL 



Fig. 1. Three celery plants, the middle one control; the other two were each in- 

 oculated on 4 petioles. Result after seven days — all inoculated leaves, except one, 

 rotten to base. 



Fig. 2. Potato haulms five days after four had been inoculated ; one of these has 

 collapsed. 



Fig. 3. Two young turnip plants kept under the same bell-jar: result 13 days after 

 the one on the left was inoculated on five leaves : control plant on the right. 



Fig. 4. The Celery Rot Bacillus from a young agar culture; stain Heidenhain's 

 Haematoxylin. x 600. 



Fig. 5. The bacillus stained to show flagella. x 600. 



Fig. 6. Coccus and diplococcus-hke forms of the bacillus from a bouillon culture 

 containing 5 "o alcohol. x 600. 



Fig. 7. Filamentous forms of the bacillus from a bouillon culture containing 0-1 % 

 benzoic acid. x 600. 



Fig. 8. Filaments from a three week's old culture in a synthetic medium containing 

 0-1 % "lysol substitute." x 600. 



Fig. 9. A "nodulose" filament from a culture in a synthetic medium containing 

 6 % alcohol. X 600. 



Fig. 10. Microtome section of inoculated celery petiole showing the partial separation 

 of the cells under the action of the organism. x 250. 



Fig. 11. Microtome section of inoculated celery petiole showing portion of a cell- 

 wall in surface view with bacilli in situ, x 500. 



{Received September 10th, 1916.) 



