INDEX OF SUBJECTS 



893 



Siderocapsa, 93 

 Sideromonas, 93 

 Silica gel media, 68, 166, 196, 220 

 plates for isolation of Azotobacter, 

 113 

 Silicates, decomposition of , by bacteria, 



646 

 Single-cell cultures, isolation of, 55, 169 

 Single-spore cultures, 245 

 Sinigrin, 600 

 Slime molds, 236 

 Slime of bacteria, 460 

 Slow growing bacteria, 153 

 Smuts in soil, 763, 808 

 Sodium formate, action of, on bacteria, 

 165, 171 

 pyrogallate, use of, in the cultivation 



of anaerobic bacteria, 167, 170 

 sulfide as reducing agent, 171 

 sulfite as reducing agent, 171 

 sulphindigotate, action of, on bac- 

 teria, 165 

 Soil, as a medium for growth of micro- 

 organisms, 619 

 atmosphere, 638-040 

 colloidal condition of, 622, 626 

 composition of, 619, 620 

 energy transformation in, 425 

 environments, relation to plant in- 

 fection, 810 

 extract agar, 15 

 extract gelatin, 17 



fertility and microbiological ac- 

 tivities, 708 

 gases, 626 



humus, nature of, 669 

 inoculation, principles of, 817-833 

 inoculation, with non-symbiotic bac- 

 teria, 105 

 oxidation processes in, 522 

 population, 642 



reaction and microbiological activi- 

 ties, 633-638 

 sampling, 19-21 

 solution, 631-633 

 sterilization, 641 

 temperature, 640 

 use of, for legume inoculation, 821 



Soil, variability, 20 



Soja (see Glycine) 



Solanaceae, mycorrhiza formation by, 



275 

 Solid media for isolation of nitrite 



forming bacteria, 68 

 Solution method, 710 

 Solvent action of algae, 235 

 Sordaria, 251 



Soy bean, nodule bacteria of, 137 

 Spathidium, 335 

 Specific differentiation of actinomyces, 



290 

 Sphaeronema, 257 

 Sphaeropsidales, 257, 276 

 Sphenoderia, 332 

 Sphenomonas, 334 

 Spicaria, 254 

 Spirillaceae, 58 

 Spirillum, 58, 82, 83, 141 

 Spirochaeta, 58 



cytophaga, 195, 196, 203, 368, 439, 770 

 Spiromonas, 334 

 Spitonema, 334 



Spirophyllum, 93, 94, 95, 100, 402 

 Spirostomum, 336 

 Spondylomorum, 217 

 Spongomonas, 334 



Spongospora subterranea, 808, 812, 815 

 Sporangiophorae, 247 

 Spore-forming bacteria, 10, 60, 141, 



142, 143, 209 

 Spores of fungi, germination of, 246 

 Sporogenous hyphae of actinomyces, 



294 

 Sporormia, 251 

 Sporozoa, 314 



Sporotrichum, 3, 254, 264, 265 

 Spring vetch, nodule bacteria of, 136 

 Stachobotrys, 255, 264 

 Staining, of flagella, 132 

 of nitrite-forming bacteria, 74 

 of protozoa, 323 

 Standard loop for counting protozoa, 



45 

 Staphyinidae, 358 

 Staphylococcus, 612, 631, 641 

 Starch agar, 39, 291 



