PLATE 19. 

 Bacterium coli (Escherich). L. and N. 



I. Gelatin plate, eight days at 22. X 60. Cultivated 

 from pus. Deep colonies of abnormal form. 



II. Gelatin plate, four days at 22. Natural size. 



III. Gelatin plate, one day at 22. X 90. Superficial 

 colony. Compare also Plate 14, vm ; Plate 16, vin. 



IV. Gelatin plate, four days at 22. X 60. Superficial 

 colony. Compare also Plate 16, ix; Plate 17, i, u. 



V. Gelatin plate, four days at 22. X 60. Deep colo- 

 nies. 



VI. Gelatin plate, ten days at 22. X 90. Superficial 

 colony. 



VII. Gelatin plate, ten days at 22. X 90. Superficial 

 colony. 



VIII. Microscopic preparation. Pure culture from agar 

 plate. X 500. 



IX. Different varieties of coli bacteria. X 1000. Vari- 

 able sizes. 



IX. 



