INDEX. 



281 



Pngc. 



Pcp(one, 



commercial .^ 



reaction of cliolcra organism willi 220 



tests for pnrit\' of 220 



Peptonc-liacteria J7^ 



Peroxides, organic, yermicidal action of 2Si 



Petri, nitrates in commercial gelatin 224 



Petri-dishes 226 



for excluding- light 228 



fnr quantitative work and photographing. . . 36 



of good qualit_\', where ohtained 82 



sterilization of 100 



Petri und ]\Iaassen, hydrogen sulphide from 



hacteria 24-? 



Phenol '^.. .....^ 74 



tests for 6j 



Phcnolphthaleiu, 



for use in titration qg 



neutral point of f^g 



Photographic enlargements 147 



Photographic plates, for special work 1.^6 



Photographic prints, 



drawings on 151 



making of 150 



Photographing, 



of bacteria in tissues 1,36 



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, inthience of, on mor- 

 phology J 77. --- 



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 '^5. 223 



effect of symbiosis on 223 



how regenerated -37 



literature on 23b 



variabilitj' of 222, 238 



Pipettes, 



discarded, care of 107 



sterilization of 100 



Pitfield's flagella stam 191 



Planococcus 100 



Plant acids, sensitiveness of bacteria h) 69 



Plant juices used as culture-media 41 



Plasmolysis, concentration necessary for 254 



Plasdds of T-Tallicr 176 



Pbate-cultures, 



advantages of, for isolating bacteria IT 



arran.genient of rfnls in colonies on 27 



cliaracters to lie noted 29 



fliscarded, care of 107 



how to avoid eonlaminations in 103 



Koch's, fr.r olilaining pure eullures 226 



laljelin.g of m 



pnured, how made 105 



Plates, 



isochromatic, for photographing stained 



secti' nis 140 



isochromatic, time of exposure with 143 



isochromatic, uses of 136 



non-halation, uses of 136 



non-isochromatic, wdicn preferal.de 136 



Platinum black, enz)-me-like action of 234 



Platinuni-iridium, inoculatin.g needb'S and 



loops 43 



Pleeimorpbism 176 



Pleuro-pneiimonia, organism causing, 



at limit o( vision iS 



cultivation of, outside animal body 213 



Plugs, paraffined 99 



Plum, 



natural infection in 86, 88, 92, 148 



organism from iS 



subject to pear-bli,ght 88 



Pneumococcus, origin of capsule 221 



Pedyangium 165 



popoff, germicidal action rjf 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 5' 



sulfate, effect on luminous bacteria 60 



Potato, steamin.g of 98 



Potato-lirolh, 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 



P^eudomona3 160, 173 



Ps. indigo fera, small size of iS 



Ps. syringae, reaction to nitrates 64 



Pseuib-i-zoogloeae 22 



Pure cultures, how (.'fitained 11 



Pyocyanin, test for 65 



P\'oktanin 74 



Pyrogallol, with caustic potash as absorbent of 



oxygen 57 



P_\ rogallol de\'eleii>er 200, 20J 



