V i i i ILL US TRA TIONS 



*BACILLUS COLI COMMUNIS ....... 66 



*BACILLUS MYCOIDES 66 



PASTEUR-CHAMBERLAND FILTER So 



PROTEUS VULGARIS .......... 86 



BACILLUS ENTERIDITIS SPOROGENES ....... 86 



A PLAN OF SEPTIC TANK AND FILTER-BEDS 91 



FILTER-BEDS 94 



MIQUEL'S FLASK 97 



SEDGWICK'S SUGAR-TUBE 99 



SEDGWICK'S TUBE . . . . . . . . . . 100 



SACCHAROMYCES CEREVISLE 117 



ASCOSPORE FORMATION 120 



GYPSUM BLOCK 121 



YEAST to face 122 



ASCOSPORE FORMATION IN YEAST 122 



NITROGEN-FIXING BACTERIA FROM ROOTLET NODULES . " 122 



*BACILLUS OF TETANUS "122 



SACCHAROMYCES ELLIPSOIDEUS 126 



SACCHAROMYCES PASTORIANUS 126 



BACILLUS ACIDI LACTICI 131 



BACCILLUS BUTYRICUS 133 



KIPP'S APPARATUS .......... 140 



FRANKEL'S TUBE ............ 141 



BUCHNER'S TUBE 141 



A METHOD OF GROWING CULTIVATIONS IN A VACUUM OVER PYROGALLIC 



SOLUTION 143 



MlCROCOCCUS FROM SOIL 151 



NITROUS ORGANISM to face 158 



NITRIC ORGANISM . . . . . . . . . " 158 



NITROGEN-FIXING ORGANISM FROM SECRETION OF ROOT-NODULES, " 158 



ROOTLET OF PEA WITH NODULES ....... 163 



NlTROGEN-FlXING BACTERIA IN SlTU IN NODULE ON ROOTLET OF 



A PEA to face 164 



NlTROGEN-FlXING BACTERIA IN SlTU IN ROOTLET-NODULE OF A 



PEA. .......... to face 164 



NlTROGEN-FlXING BACTERIA IN SlTU IN ROOT-NODULE OF A PEA, " 164 



BACILLUS OF TETANUS 170 



BACILLUS OF SYMPTOMATIC ANTHRAX . . . . . .172 



BACILLUS OF MALIGNANT OEDEMA . . . . . . .172 



A CENTRIFUGE 228 



SUSPENDED SPINAL CORD 255 



FLASK USED IN THE PREPARATION OF THE TOXIN OF DIPHTHERIA . 262 



*BACILLUS TUBERCULOSIS to face 280 



