VUl 



ILL USTRA TIONS 



to face 



*Bacillus Coli Communis . 



*Bacillus Mycoides . 



Pasteur-Chamberland Filter . 



Proteus Vulgaris 



Bacillus Enteriditis Sporogenes 



A Plan of Septic Tank and Filter-Beds 



Filter-Beds . 



Miquel's Flask . 



Sedgwick's Sugar-Tube 



Sedgwick's Tube . 



Saccharomyces Cerevisi^ 



AscospoRE Formation 



Gypsum Block 



Yeast 



AscospORE Formation in Yeast. 



Nitrogen-Fixing Bacteria from Rootlet Nodules 



*Bacillus of Tetanus 



Saccharomyces Ellipsoideus 



Saccharomyces Pastorianus 



Bacillus Acidi Lactici 



Baccillus Butyricus . 



Kipp's Apparatus 



Frankel's Tube . 



Buchner's Tube , 



A Method of Growing Cultivations in a Vacuum over Pyrogallic 



Solution .... ... 



Micrococcus from Soil 



Nitrous Organism . . . to face 



Nitric Organism . " 



Nitrogen-Fixing Organism from Secretion of Root-Nodules, " 



Rootlet of Pea with Nodules 



Nitrogen-Fixing Bacteria in Situ in Nodule on Rootlet of 



A Pea .... to face 



Nitrogen-Fixing Bacteria in Situ in Rootlet-Nodule of a 



Pea 



Nitrogen-Fixing Bacteria in Situ in Root-Nodule of a Pea, 



Bacillus of Tetanus . 



Bacillus of Symptomatic Anthrax 



Bacillus of Malignant CEdema 



A Centrifuge .... 



Suspended Spinal Cord 



Flask Used in the Preparation of the Toxin of 



♦Bacillus Tuberculosis 



6b 

 66 

 80 

 86 

 86 

 91 

 94 

 97 

 99 



TOO 

 117 

 120 

 121 

 122 

 122 

 122 

 122 

 126 

 126 



140 

 141 

 141 



158 

 158 

 163 



164 



