ng virulence of organisms, 320

Examination of milk, 441

Experimental infections, study of, during life, 370
inoculation of animals, 332

Extracellular toxins, 144

Eyepiece, Ehrlich, 55
_micrometer_, 63

Eyepieces, 55

Eye-shade, 57

Fahrenheit degrees, conversion of, 495

Feeding experiments, 369

Fermentation reactions, 279
tubes, 17

Field of objective, 56

Filar micrometer, 66

Filling tubes, etc., with medium, 160

Film preparations, 81
fixing, 81
making, 81
mounting, 85
staining, 83

Filter candle, closed, 47
open, 43
testing efficiency of, 478
to disinfect, 28
to sterilise, 29
flask, 6
papers, to fold, 156

Filters, cotton-wool, 40
porcelain, 42
testing of, 478

Filtration, 40
by aspiration, 42
of media, 156
under pressure, 45

Fine adjustment, 51
spindle head, 52

Fish, analysis of, 460
bouillon, 190

Fish gelatine, 190
gelatine-agar, 190

Fishing colonies, 253

Fission, reproduction by, 136

Fixation, 81
by heat, 81
of tissues, 114

Fixing fluids, for films, 82

Flagella, classification of bacilli by, 136
to stain, 101

Flask Bohemian, 4
Erlenmeyer, 4
filter, 6
Kitasato'a serum, 6
Kolle's culture, 4

Flasks and test tubes, to plug, 24
to clean dirty, 20
new, 18
to sterilise, 31

Fleischwasser, 148

Fluid cultures, description of, 271
media, 146

Foot of microscope, 50

Formaldehyde in milk, Hehner's test for, 442

Formalin method of preserving cultures, 407
tissues, 404

Fractional sterilisation, 33

Fraenkel and Voge's solution, 183

Fraenkel's earth borer, 472

Freezing method for sections, 115

French Mannite Agar (Sabouraud), 193
proof agar (Sabouraud), 193

Fresh preparations of bacteria, 74

Friedlaender's capsule stain for sections, 123

Frost's mounting fluid, 406

Frozen sections, rapid method, 116

Fuchsin, 92
agar (Braun), 205
sulphite agar (Endo), 206

Gas analysis, qualitative, 290
quantitative, 290
collecting apparatus, 291
generators, 242
production by bacteria, 289
tubes for media, 161

Gasperini's solution, 193

Gelatin agar, 193
preparation of, 164
surface plates, 231

General anaesthetics, 345

Gentian violet, 91

German lined paper, 69

Germicides, 27
testing power of, 480

Germination, 140

Geryk air-pump, 43

Glass apparatus in common use, 3
to clean, 18

Glass-cutting knif