1895.] MICROSCOPICAL JOURNAL. 151 



ed at ends, occuring singly or in chains of two or three, 

 staining uniform and readily with fuchsin and gentian 

 violet ; in old cultures it stains with diflBculty. In hang- 

 ing drops the bacillus exhibits a lively motion. The or- 

 ganism has considerable vitality, cultures four months 

 old growing readily when transferred. Spores not 

 observed. 



Agar agar. — Cadmium yellow growth spreading over 

 surface and following track of needle. Grows well at 

 temperature of room. 



Gelatin. — Cadmium yellow growth follows track of 

 needle; confined to a narrow area of surface. Yellow 

 only on surface, colorless down in medium. Does not 

 liquefy gelatin. 



Potato. — Rapid growth over surface of potato ; round, 

 granular raised colonies ; color lighter yellow than on 

 agar. 



Bouillon. — At first a yellowish white growth on surface, 

 with very slight metallic lustre where pellicle is thin ; 

 finally falls to bottom of tube. 



Fermentation tube. — Five per cent cane sugar. Does 

 not produce gas. Grows in bulb, not in tube. But 

 slightly anaerobic. 



Blood serum. — Yellow growth along track of needle. 

 No liquefaction. Growth rapid at temperature of room. 



Pathoge7iesis. — Produces a characteristic rot in rutaba- 

 gas and yellow turnips ; at first confined to fibro-vascular 

 region, soon involving nearly all of the rutabaga. Strong 

 odor of rotting rutabagas and turnips. 



EXPLANATION OF PLATE. 



Figure 1— Rutabaga slightly reduced, showing rotten part of stem in cross 

 section and breaking out on sides, natural size. Drawn by Miss C. M. King. 



Figure 2 — Bacilli from fluid part, having motion 



Figure 3 — Bacillus campestris from culture, causing rot, greatly magnified- 



Figure 4 — Portion of rutabaga .showing black tibro- vascular region ; which 

 is slightly reduced. Drawn by Miss King. 



Figure 5 — Bacillus campestris culture on agar ; slightly reduced. 



Figure 6 — Bacillus culture on Potato. Drawn by Miss Fibbs. 



