INDEX. 



28l 



gg 



I5O 



Page. 



Peptone, 



o immen-ial .............................. 45 



reaction of cln.Irra organism with .......... 229 



tests fur purity of ........................ 229 



Peptone-bacteria ........................... i-- 



Peroxidcs, organic, germicidal notion of ...... 25;, 



Petri, nitrates in commercial gelatin ......... 224 



l'> in-dislies ........................... . 226 



for excluding light ........................ 228 



for quantitative work and photographing. . . 36 

 of good quality, where obtained ............ 82 



sterilization of ............................ 100 



Fctri und Maassen, hydrogen sulphide from 



bacteria .............................. 243 



Phenol .................................... -^ 



tests for ................................. 63 



Phenolphthalein, 

 tor use in titration 

 neutral point of 



Photographic enlargements .................. 147 



Photographic plates, for special work ........ 136 



Photographic prints, 

 drawings on .............................. jjl 



making of 



Photographing, 

 of bacteria in tissues ...................... 1-56 



of poured-plate colonies ................... 134 



of test-tube cultures ...................... 135 



Photography, 

 focusing planars .......................... !32 



lenses for ............................. l 3Oi 133 



Photomicrography ...................... 263, 264 



Photomicrographic apparatus ......... 23, 129, 136 



care of ................................... !3p 



Photomicrographs, 

 making of ................................ I3 g 



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 ............................ IO o 



Pitfield's flagella stain ....................... 191 



Planococcus ............................... 160 



Plant acids, sensitiveness of bacteria to ...... 69 



Plant juices used as culture-media ........... 41 



Page. 



Plasmolysis, concentration necessarv for. . 2=54 



Plastids of Hallicr " $ 



1 'late-cultures, 



advantages of. for isolating bacteria 11 



arrangement of rods in colonies on 27 



characters to be noted 29 



discarded, care of 107 



how to avoid contaminations in 103 



Kncli's, for obtaining pure cultures 226 



labeling of nr 



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-indium, 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, 14^ 



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 



I '\ uktanin 74 



Pyrogallol, with caustic potash as absorbent of 



'ien 57 



Pyrogallol developer 200, 201 



