868 



INDEX OF SUBJECTS 



Actinomyces sulfur eus, 305 



tricolor, 304 



verne, 305, 307 



violaceus, 300 



violaceus-caesari, 30S 



violaceus-ruber, 304, 307, 309, 444 



viridochromogenus, 307, 309, 379, 444 

 Aclinophrys sol, 331 

 Actinopoda, 331 

 Adaptation of nodule bacteria to host 



plant, 138 

 Adenine in soil, 479 

 Adenoplea, 345 

 Adineta, 351 

 Adsorption, in soil, 629-630 



of bacteria, 631 

 Aerobacter aerogenes, 212 

 Aerobic bacteria, 4, 112, 141, 145 



utilization of energy bj', 410 

 Aerophile bacteria, 160 

 Agar plate method, for counting bac- 

 teria, 13 



for counting protozoa, 45 



for isolation of algae, 219 

 Agar tubes, deep, use of, in the isola- 

 tion of anaerobic bacteria, 164, 168 

 Agaricus, 243, 261 

 Agricere, in soil, 465 



theory of soil fertility, 759-761 

 Agriotes, 356, 35S 

 Agroceric acid, 671 

 Agrosterol in soil, 671 

 Air-drying of soil, influence of, on 

 activities of microorganisms, 539, 

 740-743 

 Alaimus*, 350 

 Albumin agar, 16 



Alcohol, formation by microorganisms, 

 412, 413, 440. 



oxidation of, by bacteria, 99 



utilization by fungi, 242 

 Aldehydes in soil, 671 

 Alfalfa, nodule formation by, 136 

 Algae, in soil, 3, 50, 215-235 



composition of, 378 



corroding action of, 645 



cultivation of, 218 



distribution of, in soil, 222 



Algae, isolation of, in pure culture, 221 

 nitrogen fixation by, 105, 121, 232-233 

 role of, in the soil, 234 

 Algal fungi (see Phycomycetes) 

 Alinit preparation, 105, 831 

 Aliphatic hydrocarbons, decomposi- 

 tion of, 465 

 Alkali soils, neutralization by sulfur 

 oxidation, 616 

 occurrence of algae in, 224 

 Alkaline pyrogallol solution, 170 

 Alkaloids, content of, in leguminous 

 plants, 596 

 use of, in stimulation of bacteroid 

 formation, 131 

 Allantoin, formation of, in the decom- 

 position of uric acid, 212, 486 

 Allantion tachyploon, 333 

 Allocoelae, 345 

 AUogromia fluvialis, 332 

 Alloloboplwra, 352 

 Alnus, bacteria in, 105, 138 

 Aloin, as indicator of oxidation in soil, 



523 

 Alsike clover, nodule bacteria of, 136 

 Alternaria, 244, 256, 258, 265, 779, 807 

 Aluminum, transformation of, in soil, 



666 

 Amanita, 276, 278 

 Atablyosjyorium, 253 

 Amides, decomposition of, 485 

 Amines, formation by bacteria, 178 

 Amino acids, as sources of energy, 419 

 formation of, in synthetic processes, 

 424 

 Amino nitrogen, as index of protein 



decomposition, 476 

 Ammonia formation, as index of pro- 

 tein decomposition, 475, 501, 685 

 as influenced by presence of non- 

 nitrogenous organic substances, 

 504 

 by bacteria, 178, 4S9 

 by fungi, 266,376,493 

 chemistry of, 480 

 from different organic materials, 



511, 512 

 in the reduction of nitrates, 182 



