INDEX 



143 



Hayduck's medium, 18 

 Heidenhains hsematoxylin, 112 

 Heterotrophic bacteria, 2 

 Heyden agar, 9 

 Humus, determination of, 78 

 Hydrogen bacteria, medium for, 30 

 sulphide bacteria, 139 

 Bavendamm, 30 

 Hydroxylamine, test for, 58 



I 



Indicators, 53 



Indol, test for, 61 



Ink method, capsule stain, 49 



Insects, number in soil, 105 



Invertebrate population of soil, 94 



Iron bacteria, 133 



oxidizing bacteria, media for, 31 

 precipitating bacteria, 132 



Isolation of anaerobic bacteria, 118 



Mannitol, nitrogen free, 32 

 phosphate solution, 20 

 soil extract, 20 

 Manure, effect on number of micro- 



orgamisms, 103 

 Media, 1 



Mercuric chloride, disinfectant solu- 

 tion, 90 

 seed steriUzation, 82 

 Methane bacteria, medium for, 



31 

 Methods of staining, 47 

 Methyl orange, 52 



red, 67 

 Methylene blue as indicator of 



anaerobiosis, 46 

 Microscopic examination of soil, 104, 



105 

 Milk, culture media, 39 

 brom cresol purple, 39 

 Moisture determination, 61 



K 



N 



Koch, 1 



Koser's medium for colon-aerogenes 



group, 43 

 Krainsky's medium, 13 



Laboratories, supplying cultures, 139 

 Laboratory rules, 89 

 Lagerberg's spore stain, 50 

 Leguminous plants, bacteria of, 106 

 Lignins, 75 

 Literature, 137 

 Litmus, 52 

 milk, 39 

 Loeffler's alkahne methylene blue, 47 

 Lugol's iodine, 48 



M 



Malt extract agar, 16 

 Manganese, oxidizing 

 media for, 31 



bacteria, 



Nahrstoff-Heyden agar, 9 

 Negative stain, 109 

 Nematodes, number in soil, 103 

 Nessler's reagent, 56 

 Nesslerization of ammonia, 62 

 Nigrosin negative stain, 50 

 Nitrate formation, 123 



reducing bacteria, media for, 25 

 Nitrates and nitrogen fixation, 120 



determination of (reduction), 65 



quantitative determination of, 63 



reagent, 57, 59 

 Nitrification in Hquid cultures, 123, 

 124 



of various substances, 125 

 Nitrifying bacteria, enrichment cul- 

 tures, 123 



media for, 22 

 Nitrite formation, 123 

 Nitrites, test for, 57 

 Nitrobacter, 125 



solution for, 23 



