XVI CONTENTS. 



CHAPTER XII. 



PAGE 



SYSTEMATIC AND DESCRIPTIVE . . . .194 



GROUP I. COCCACE^; ....... 194 



Genus I. Streptococcus . . . . . .195 



,, II. Merismopedia ...... 208 



III. Sarcina . . . . . . .210 



,, IV. Micrococcus . . . . . .213 



,, V. ASCOCOCCUS ...... 222 



GROUP II. BACTERIACE^E . . . . . . 224 



Genus I. Bacterium ........ 225 



,, II. Spirillum . ..... 249 



,, III. Leuconostoc ...... 262 



,, IV. Bacillus . . x .... 265 



V. Vibrio ....... 317 



,, VI. Clostridium . . . . . .318 



GROUP III. LEPTOTRICHE^E . . . . . .321 



Genus I. Crenothrix ...... 322 



,, II. Beggiatoa . 324 



,, III. Phragmidiothrix ...... 328 



IV. Leptothrix . . . . . .329 



GROUP IV. CLADOTRICHE^ ...... 330 



Genus I. Cladothrix . . . . . -33 



APPENDICES. 



A. Yeasts and moulds . . . 340 



B. Flagellated protozoa in the blood . . -35 



C. Examination of air . . 3 6r 

 D*. Examination of soil ... 3^5 

 . Examination of water . , . 366 



F. Chronological bibliography . . . 37 



G. Table showing the magnifying power of Zeiss' objectives . . 430 



