2 7 8 



BACTERIA IN RELATION TO PLANT DISEASES. 



Page. 



Lantern-slides continued. 



development of 146, 201 



exposure of 146 



Larkspur, natural infection in 92, 139 



Laser, on action of hydrogen peroxide 234 



Lautenschlager oven 100 



Lead acetate paper 62 



Leguminosae, 

 root-tubercle bacilli of, fixation of nitrogen 



by 64 



Moore's culture-medium for 197 



Lenses, 



achromatic, defects of 14 



apochromatic, in photomicrography 139 



for bacteriological work 23 



Lenses, photographic, 



Goerz 130 



Voigtlaender 130 



Zeiss Double- Protar 130, 132 



Zeiss Planar 132 



Zeiss Protar 132 



Zeiss Unar 132 



Lenticels, natural infection through 92 



Lepeschkin, branched form described 218 



Leucin 63 



Leuconostoc mesenterioides, isolation of 106 



Levin, bacteria rare in Arctic 255; 



Levy, physical properties of enzymes 68 



Lewandowski, test for phenol 63 



Liborius, oxygen in depths of agar 230 



Light, 



action on bacteria 71, 243, 244 



bactericidal action ascribed to hydrogen 



peroxide 244 



germicidal action on dust greatest when 



moistened 244 



germicidal in hydrogen 244 



germicidal action in water 244 



Light filter for photomicrography, 



dry 24 



Zettnow's 24, 201, 263 



Lilac blight 64 



Liquefaction in gelatin stab-cultures, 



characters to be noted 29 



interferences of various substances with. ... 29 



Liquid air, effect of, on bacteria 79, 247 



temperature of 80 



Lister, dilution method for obtaining pure 



cultures 27, 226 



Litmus-lactose-agar 33, 196 



Litmus milk, 



cultures in, observations on 48 



preparation of 48, 196 



Litmus paper, for testing acidity 61 



Litmus, reduction of, by bacteria 62 



Loeb, typhoid bacillus, branching forms in... 218 

 Loeffler, 



alkaline methylene blue 188 



extraction of enzymes 68 



flagella-stain icjo 



Loew, 



culture-medium for Bacillus prodigiosus. . . 239 

 enzymic fermentation of tobacco 257 



Page. 



London, resistance to starvation 223 



Loops, platinum-indium, for making transfers . 43 



Loquat, bacterial disease of 88 



L6 wit's flagella-stain 192 



Luminous bacteria 60, 241 



cause of luminosity of 60 



culture-medium for 198 



Dubois' fluid medium for 242 



effect of chlorides on 60 



effect of magnesium sulfate on 60 



effect of manganese sulfate on 60 



effect of potassium iodide on 60 



effect of potassium nitrate on 60 



effect of potassium sulfate on 60 



in or near salt water 60 



in sand-fleas 60 



Molisch's work on 60 



on meat exposed in markets 60 



on synthetic media 60 



spectrum of 242 



thermal relations of 60 



Lunt, stock-cultures of water-bacteria, how 



best kept 263 



Lysol, 



for sterilizing surface of diseased material. 14 



germicidal action of 251 



Maassen, 



branching forms produced at will by 23 



culture-fluid of 198 



fruit-ether-forming bacteria 259 



reducing powers of bacteria 62, 243 



Mace, 

 recuperation of pigmentation and pathogen- 



icity 237 



ruled counting-plate 36 



Macfadyen, 



effect of liquid air on bacteria 247 



thermophilic bacteria 248 



Mackensie's culture-fluid 198 



Magnesium chloride, effect on luminous bac- 

 teria 60 



Magnesium sulfate, effect on luminous bac- 

 teria 60 



Magnification, determination of 115 



Maize, 



artificial infection of 90 



cross-section of stem 4 



natural infection in 92 



Malachite green, use of 189, 222 



Maltose-agar 33 



Manganese sulfate, effect on luminous bac- 

 teria 60 



Marmier et Abraham, germicidal action of 



ozone 252 



Marpmann, 



" chromo-agars " for differentiating 229 



germicidal action of sodium fluoride 253 



iron bacteria 261 



Marsh gas 61,209 



Maximum temperature, 



how determined 75 



range of 87 



Mayer's culture-fluid 197 



Maze, root-tubercle bacteria 240 



