Milk, blue, 31, 34 Bulgarian, 98 digestion of, 102 flavors in, 110 glands, 244 identification of, 269 litmus, 177 pasteurization of, 141, 144-147 as path of elimination, 248 preparation of, 177 purifier, electric, 152 souring of, 32 sterilization of, 177 tuberculous, 248 Minimum conditions, 72, 73, 74, 77 lethal dose, 264 Mirror, use of, 200 Mixed infection, 234 vaccine, 285 Mixotrophic, 86 M. L. D., 264 MOHLER, 167 Moist heat, 133 Moisture, 73 Mold colonies, 226 Molds in alcoholic fermentation, 100 in relation to bacteria, 37, 39 Molecular respiration, 88, 89 Monas, 33 Monkeys, 227 Monotrichic, 45 MONTAGUE, 24 Mordants, 204, 211 Morphology, 41-58 in identification, 171, 212 Mosquitoes and malaria, 25, 242 Motile bacteria, 45 Motion of bacteria, 47 Brownian, 47, 203 Mounting in balsam, 207 Mouth cavity, 244 Mu, 40 Mucosæ as channels of infection, 244 MÜLLER, 33, 34, 59 Mumps, 239 Municipal disinfection, 170 MÜNTZ, 32, 35 Muscardine, 34 Mycelia, 39, 226 _Mycobacteriaceæ_; 64 _Mycobacterium_, 64, 69 of Johne’s disease, 209 _lepræ_, 209 _smegmatis_, 209 _tuberculosis_, 83, 176, 209 Mycoproteid, 83 Mycorrhiza, 119 Myxomycetes, 38 N NÄGELI, 29, 35 Nasal cavity, 244 discharges, 248 Natural gas, 95 immunity, 251, 252, 296 NEEDHAM, 20, 33 Needles, inoculation, 192 Negative complement-fixation test, 278 phase, 287 Neisser’s granules, 45 stain, 212 NENCKI, 83 Nephrolysin, 272 NEUFELD, 281 Neurin, 104 Neurotoxin, 272 NEUVEL, 43 Nichrome wire, 193 Nitrate broth, 177 Nitrates in soil, 115 Nitric bacteria, 114 Nitrification, 32, 35 Nitrite, oxidation of, 114 Nitrogen, absorption of, 117 in bacterial cell, 89 circulation, 109 cycle, 107 fertilizers, 120 liberation, 104 nutrition of green plants, 118 use of, 103 Nitrous bacteria, 114 Non-pathogenic, 87 Non-specific disease, 233 Normal agglutinins, 266 serum, 272 _Nosema bombycis_, 29, 35 NOVY, 183 jar, 192 Noxious retention theory, 255 Nuclein, 42, 43 Nucleoprotein, 43 Nucleus, 42, 43 Nutrition of green plants, 118 NUTTAL, 271 O OBERMEIER, 29, 35 Objective, oil immersion, 200, 201 Oblique germination of spore, 48 Occurrence of bacteria, 71 Official classification, 59 _Oidium albicans_, 27, 34 Oil bath, 167 essential for clearing, 209 immersion objective, 200, 201 relation of bacteria to, 116 OMODEI, 27 Opsonic index, 281, 282, 287 method, 282 power, 287 Opsonin, 281 Opsonins, 281, 282, 295 Optimum conditions, 72, 73, 74 Order, receptors of first, 261-264 of second, 265-270, 281 of third, 271-279 Organic acids, 84, 110 catalyzers, 123