INDEX 



Acid, resistant finish for tables, 91 



sucrose agar, 13 

 Actinomyces, media for, 18 

 Aeration method for ammonia deter- 

 mination, 63 

 Agar, chemical composition, 5 



general properties, 5 



washed, 5 

 Albuminate agar, 9 

 Algse, culture media for, 20 



in soil, 93 



number in soil, 97 

 AUzarine, 52 

 Amino acids, decomposition of, 138 



nitrogen, 69 

 Ammonia, determination in soil, 127 

 quantitative, 62 



production, 127 



test for, 56 

 Anaerobic bacteria, 11, 43 



culture media, 11 



number in soil, 100 



cellulose fermentation, 133 

 culture methods, 46 



nitrogen fixation, 118 

 Analysis of plant material, complete, 



76 

 Apparatus for one student, 89 

 Artificial cultures, 110 

 Ashby's medium, 20 

 Asparagin, mannitol agar, 11 



sodium lactate gelatin, 27 



starch agar, 14 

 Autotrophic bacteria, 2 

 Azotobacter colonies, 115 



growth on different carbohydrates, 

 117 



Azotobacter colonies, in soil, 114 

 isolation of, 114 

 nitrogen fixation by, 116 



B 



Bacillus celluloses dissolvens, 135 



cereus, 128 

 Bacteria in soil, 92 



number in soil, plate method, 99 

 Bacterium fluorescens, 128 



hartlebii, 122 



pyocyaneum, 122 



radiobacter, 116 

 Bacteroid formation, 34 

 Barium hydroxide solution standard, 



56 

 Barlow stain, 51, 109 

 Bean extract, 34 

 Beef extract agar, 8 

 Beef extract gelatin, 8 

 Black finish for tables, 91 

 Bouillon, 8 



Brain, sheep or beef, 43 

 Bristol's medium for algae, 21 

 Brom cresol purple milk, 39 

 Brucine reagent, 59 

 Bryan's medium, 45 

 Burri's PeUkan Tusche, 49 



Caffein bean extract, 34 



Calcium hypochlorite, seed sterihza- 



tion, 83 

 Capsule stain, 49 

 Carbohydrates, determination of, 



69-76 

 Carbohydrates, effect on nitrogen 



fixation, 120 



141 



