INDEX 



413 



Nitrogen-fixation studies, media 



for, 354, 355 

 -fixation, non-symbiotic, 253- 



255, 264 

 -fixation, symbiotic, 256-263, 



264 



from nitrates, 44, 134 

 inorganic as food, 172, 173 

 organic, 172, 173 

 Nodule formation, observation of, 



259-262 

 Nodules, on leguminous plants, 



256-263 



Non-electrolytes, 195, 196 

 NORGAARD, V. A. and MOHLER, 



J. R., 307 



Normal acid, 20-22, 367, 368 

 alkali,>0-22, 368 

 solutions, 20-22, 367, 368 

 NORTHRUP, Z., 169, 215 

 Nose, microflora of, 150 

 Nosepiece, collar, 66 



triple, 65 

 Notebook, xi 

 NOVY, F. G., 132, 158, 160, 164, 



202 

 Novy's jars, anaerobic, 158, 160, 



164 



NOYES, WM. A., 20 

 Nuclei, stain for, 99 

 Nutrient media, 18-20, 23-44 

 Nutrose, 361 

 NUTTALL, G. H. F., 323 



O 



Objective, oil immersion, 69, 71 

 Objectives, 63, 66, 67, 69, 71, 77 



achromatic, 71 



cleaning of, 66 

 Obligate, 154 

 Oculars, 66-72 



cleaning of, 66 

 Odor, fecal, cause of, 132 



Oidiam, 101 

 Oil, cedar wood, 372 

 immersion, 66, 69, 372 

 linseed, 365 

 of garlic, 15 

 of mustard, 15 

 olive, 157 



Oleomargarine, 285 

 Omelianski's medium, 248, 352 

 Oospora lactis, 101, 107, 108, 169, 



198, 205, 207, 214, 215 

 Operation, site of, 297-300 

 Opsonic index, determination of, 



319-321 



test, McCampbelPs modifica- 

 tion, 321 

 Opsonins, demonstration of, 319- 



321,370 

 Optical axis, 66 

 Orcin, 369 

 Organic matter, effect of chloride 



of lime on, 236-238 

 OBI, 157 



Osmotic pressure, 52-54, 196 

 Outline, for study of microbiology, 



331-346 



Oven, for hot-air sterilization, 7 

 Over-heating media, 26 

 Oxidases, 181, 183, 184 

 Oxidation, 183, 184, 237 

 Oxygen, absorption of, 156, 160- 



164 



free, liberation of, 181, 184, 240 

 requirements, 131 

 tolerance, 154, 164 

 transference of, 181 



Paper, effect of sterilization on, 



7 



filter, in media, 352 

 lens, 66 

 uses of, 15, 16 



