*BACILLUS COLI COMMUNIS " 66 *BACILLUS MYCOIDES " 66 PASTEUR-CHAMBERLAND FILTER 80 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 CEREVISIÆ 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 BACILLUS BUTYRICUS 133 KIPP'S APPARATUS 140 FRÄNKEL'S TUBE 141 BUCHNER'S TUBE 141 A METHOD OF GROWING CULTIVATIONS IN A VACUUM OVER PYROGALLIC SOLUTION 143 MICROCOCCUS 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 NITROGEN-FIXING BACTERIA IN SITU IN NODULE ON ROOTLET OF A PEA _to face_ 164 NITROGEN-FIXING BACTERIA IN SITU IN ROOTLET-NODULE OF A PEA " 164 NITROGEN-FIXING BACTERIA IN SITU IN ROOT-NODULE OF A PEA " 164 BACILLUS OF TETANUS 170 BACILLUS OF SYMPTOMATIC ANTHRAX 172 BACILLUS OF MALIGNANT ŒDEMA 172 A CENTRIFUGE 228 SUSPENDED SPINAL CORD 255 FLASK USED IN THE PREPARATION OF THE TOXIN OF DIPHTHERIA 262