INDEX. 



28l 



Page. 



Peptone, 



commercial 45 



reaction of cholera organism with 229 



tests for purity of 229 



Peptone-bacteria 175 



Peroxides, organic, germicidal action of 253 



Petri, nitrates in commercial gelatin 224 



Petri-dishes 226 



for excluding light 228 



for quantitative work and photographing. . . 36 



of good quality, where obtained 82 



sterilization of 100 



Petri und Maassen, hydrogen sulphide from 



bacteria 243 



Phenol 74 



tests for 63 



Phenolphthalein, 



for use in titration 99 



neutral point of 69 



Photographic enlargements 147 



Photographic plates, for special work 136 



Photographic prints, 



drawings on 151 



making of 150 



Photographing, 



of bacteria in tissues 136 



of poured-plate colonies 134 



of test-tube cultures 135 



Photography, 



focusing planars 132 



lenses for 130, 133 



Photomicrography 263, 264 



Photomicrographic apparatus 23, 129, 136 



care of 139 



Photomicrographs, 



making of 138 



time of exposure for. 143 



Phragmidiothrix 162 



Physical conditions, influence of, on mor- 

 phology 177, 222 



Physiological changes due to changed environ- 

 ment 222 



Physiological peculiarities, for identification 



of species 25 



Picric acid, 



as a fixing agent 8 



germicidal properties of 250 



Pierce, work on walnut disease 176 



Pigment- formation, 



conditions of 239 



discussion of 65, 223 



effect of symbiosis on 223 



how regenerated 237 



literature on 236 



variability of 222, 238 



Pipettes, 



discarded, care of 107 



sterilization of 100 



Pitfield's flagella stain 191 



Planococcus 160 



Plant acids, sensitiveness of bacteria to 69 



Plant juices used as culture-media 41 



Page. 



Plasmolysis, concentration necessary for 254 



Plastids of Hallier 176 



Plate-cultures, 



advantages of, for isolating bacteria n 



arrangement of rods in colonies on 27 



characters to be noted 29 



discarded, care of 107 



how to avoid contaminations in 103 



Koch's, for obtaining pure cultures 226 



labeling of in 



poured, how made 105 



Plates, 

 isochromatic, for photographing stained 



sections 140 



isochromatic, time of exposure with 143 



isochromatic, uses of 136 



non-halation, uses of 136 



non-isochromatic, when preferable 136 



Platinum black, enzyme-like action of 234 



Platinum-iridium, inoculating needles and 



loops 43 



Pleomorphism 176 



Pleuro-pneumonia, organism causing, 



at limit of vision 18 



cultivation of, outside animal body 213 



Plugs, paraffined 99 



Plum, 



natural infection in 86, 88, 92, 148 



organism from 18 



subject to pear-blight 88 



Pneumococcus, origin of capsule 221 



Polyangium 165 



Popoff, germicidal action of mercuric chloride. 252 

 Potassium, 



chloride, effect on luminous bacteria 60 



iodide, effect on luminous bacteria 60 



nitrate, effect on luminous bacteria 60 



nitrate, for differential purposes 51 



sulfate, effect on luminous bacteria 60 



Potato, steaming of 98 



Potato-broth, preparation of 42 



Potato-starch, aseptic, preparation of 50 



Prazmowski, 



arthrospores 218 



culture-fluid 197 



Precipitate, in culture-fluids, nature of 42 



Pregl, method of staining 222 



Preparation of nutrient agar 195 



Pressure, effect on bacteria 245 



Prevention of disease, methods of 93 



Proskauer & Beck's culture-fluid 198 



Prudden, bacteria in ice 258 



Pseudomonas 160, 173 



Ps. indigofera, small size of 18 



Ps. syringae, reaction to nitrates 64 



Pseudo-zoogloeae 22 



Pure cultures, how obtained n 



Pyocyanin, test for 65 



Pyoktanin 74 



Pyrogallol, with caustic potash as absorbent of 



oxygen 57 



Pyrogallol developer 200, 201 



