^74 



BACTERIA IN RELATION TO PLANT DISEASES. 



Page. 

 Dark-room, 



arrangement of 150 



ventilation of 149 



d'.\rsonval. 



negative results with ozone 252 



osmotic pressure of bacteria 247 



Darwin's wax-mixture 200 



Dawson, root-tuliercles of legumes 64 



Davenport & Castle, acclimatization to high 



temperatures 222 



Decimal system of recording characters 175 



de Freudenreich, 



bacteria in mountain air 255 



penetration of Chamberland filter by bac- 

 teria 226 



Degeneration-forms 23, 177, 252 



de Koninck, gas-generator 54 



de Lagerheim, macaroni as a culture-medium. 224 

 Delbrueck, acid fruits, effect on cholera or- 

 ganism 249 



Delphinium, bacterial disease of 92, T39 



Denitrifying organisms, Giltay & Aberson's 



culture-medium for 198 



Desiccation, efifect of 70, 24S 



Developer, 



hydrochinon 146, 201 



lantern-slide 201 



ortol 140 



pyrogallol 200, 201 



Development of negatives 140 



Dewar glasses, for liquid air 80 



Dextrin for use in fermentation-tubes 52 



Dialyzing, collodion sacks for 37 



Diastase 67 



Diastasic action, medium for study of 50, 196 



Dieudonne, part of spectrum harmful to bac- 

 teria 244 



Differentiation of species 25,225,229,230 



Dilution method for obtaining pure cultures. . 226 



Diphenylamine-test for nitrates 267 



Direct-infection experiments, value of 9 



Disease, 



conditions favoring the spread of 93 



geographical distribution of 7 



meaning of term 4 



signs of 7 



varietal resistance to 93, t86 



Disinfectants 74 



for sterilizing surface of diseased material. . 14 



literature of 250 



Disinfection of hands, wounds, floors, tables, 



etc 107 



Distilled water, 



of a high degree of purity 129 



made in large quantities 124 



made in small quantities 128 



storage of 126, 129 



Distribution, geographical 7 



Divided-plate method for study of antago- 

 nism 73 



Division of cells, arrangement after 22, 218 



Downes & Blunt, discover germicidal action 



of light 243 



Page. 



Drawings, on photographic prints 151 



Dreyer, staining of bacteria in tissues 222 



Dreyfuss, cellulose in bacteria 254 



Dry air, sensitiveness of bacteria to 71,249 



Dubois, fluid medium for luminous bacteria. . 242 



Duckwall, method of staining flagella 193 



Dunham's solution 195 



Eau de Javelle 207 



Economic a.spects, 



conditions favoring spread of disease 91 



methods of prevention 93 



natural methods of infection 91 



need of statistics relating to plant diseases. . 90 

 Egg-albumen, 



for culture-media 48 



Mayer's 119 



Eggs as a culture-medium 224, 225 



Egg-yolk, for culture-medium 49 



Ehrenberg, 



Bacterium of 165-169 



Spirillum of 173 



Ehrlich's anilin-water gentian violet 187 



Ehrlich-Weigert anilin methyl violet 187, 188 



Elective culture 106 



Embedding, method of, for microtome-sec- 

 tions 118 



Engelmann, 



green bacteria 236 



photometric bacteria 243 



Enlargements, photographic 147 



Environment, 

 influence on cultural characters . 178, 182, 183, 222 

 response morphologically to change in. 176,222 

 Enzymes, 



filtering of 68 



kinds of 66 



nature of 66 



not injured by dry heat 68 



number produced by one organism 68 



substances inhibiting action of 68 



thermal relations of 67, 233 



Errera, 



India ink in microscopy 226 



spirillum of large size 19 



Error, methods of guarding against 184 



Ether, sulphuric 74, 254 



Euspirosoma 161 



Ewart, green bacteria 238 



Ewell, anaerobic apparatus 56 



Exposure scales 143 



Exposure, time of, 



for isochromatic plates 143 



for lantern slide 146 



for Petri-dish poured plates 134 



for photomicrographs 143 



for velo.x paper 151 



Faber's pencils for glass no 



Farmer's reducing solution 142 



Favorable inlluence r.f one organism on an- 

 other 72, 74 



Fehling's solution, 



reaction of peptone with 229 



when not usalile 2a8, 234 



