ILLUSTRATIONS 



Plate I. A mycelium of Achlya infected with Bacillus pyocyaneus. The 

 infected filaments show dark in the photograph because packed 

 with bacilli which took the stain (carbol fuchsin) deeply. The 

 dark rounded masses are composed of bacteria forced out during 

 the process of growth. 

 II. A mycelium of Achlya infected with vibrios of Asiatic cholera. 

 The dark-staining filaments are packed with bacteria, and a few 

 extruded masses of bacteria are shown. 

 III. A filament of Achlya infected with Asper'gillus. The outgrowth 

 of filaments of the Aspergillus through the walls of the host is 

 shown at the end and the side of the Achlya filament. 



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