SUBJECT INDEX. 157 



PAGE 



Mohawk River, B. coli in 83 



Moisture in incubators 31 



Montsouris, bacteria in air 8 



Mud, colon bacilli in 45, 85 



Multiplication of bacteria in spring waters 16, 25 



in stored samples 25-27 



Mur River, B. coli in 83 



Nahrstoff Heyden agar 19, 20, 21, 30 



Naples, bacteria in sea- water at 10 



Neumark, typhoid bacillus in well at 53 



Neutral-red . . 97 



broth, preparation of 126 



Newburyport tap-water, bacteria in 47 



Newport supply, bacteria in 42 



New York Board of Health 82 



, examination of rivers for B. coli 83 



Nitrate solution, preparation of 124 



test 71 



, variations in 73 



Nitrification 5 



Nitrifying organisms 5 



Nitrites 5 



Nitrogen, cycle of organic 5 



Normal waters, lactose fermenting bacteria in 48 



Ohio River, B. coli in 85 



, bacteria in 41 



Organic matter, decomposition of 4, in 



in water, relation of bacteria to 37 



, oxidation of .- 5 



, relation of bacteria to 6 



Osmotic pressure, effect of upon bacteria n 



Ourcq River, bacteria in 9 



Overgrowth 62, 64 



Oxidation of organic matter 5 



Oxygen, effect of, upon bacterial counts 31 



Para-colon organisms 78, 9h 9 2 



Para-typhoid organisms 78 



Parietti's solution 50 



