Prototrophic bacteria, 131

Psychrophilic bacteria, 143
pathogenic effects, 315

Pus, collection of, 373

Pyrogallic acid solution, 293

Qualitative analysis of air, 470
of milk, 446
of sewage, 467
of soil, 476
of unsound meat, 462
of water, 426

Quantitative analysis of air, 468
of milk, 444
of sewage, 466
of soil, 473
of unsound meat, 460

Rabbit cages, 343
scabies, treatment of, 338
scales, 340

Raising virulence of organisms, 320

Ramsden's micrometer, 66

Range of medium reaction, measurement of, 305
of temperature, measurement of, 298

Rat cages, 342

Raw milk, Saul's test for, 442

Reaction of medium, 305
optimum, 305
range of, 305
scale, 153

Reduced pressure and temperature table, 501

Reducing agents, production, 389
tests for, 289

Reduction of nitrates, 389

Reichert's thermo-regulator, 218

Relation of bacteria to environment, 142

Removal of material from culture tubes, 74

Rennin enzymes, tests for, 279

Reproduction of bacteria, 136

Resistance glass, 6
to lethal agents, 306

Resting stage of bacteria, 137

Restrictions upon experimental inoculations, 334

Ribbert's capsule stain, 101

Roll cultures, 226

Rosolic acid peptone solution, 186

Rosindol reaction, 286

Roux's anaerobic culture method, 237
culture bottle, 5

Sabouraud's medium, 193

Saccharomyces, morphology of, 129

Safranine, 94

Salicylic acid in milk, test for, 443

Saprogenic bacteria, 131

Sarcinae, morphology of, 132

Saul's test, 442

Scales, decimal, 340
trip, 164

Scalpels, to sterilise, 32, 33

Schallibaum's solution, 121

Scheme for study of bacteria, 259

Schizomycetes, classification of, 131
morphology of, 131

Scissors, to sterilise, 32

Sealing museum jars, 406

Searing iron, 397

Sections, special staining methods for, 121

Sedimentation pipettes, 16
tubes, 9

Selecting objectives, 57

Sensitising red blood cells, 395

Serial cultivations, 251

Serological examination of blood, 378

Serum agar (Heiman), 210
(Kanthack and Stevens), 211
(Libman), 212
plates, 250
(Wertheimer), 211
bouillon, 210
collection of, 379
dextrose water (Hiss), 188
inspissator, 169
sugar media (Hiss), 188
water, preparation of, 170

Sewage, analysis of, qualitative, 467
quantitative, 466

Shake cultivations, 225
description of, 271

Shape of