Index and Glossary 



477 



Fallow crops, 237, 266. 



Fallowing (the cultivation of land 

 which is allowed to remain bare for 

 an entire growing season), defini- 

 tion of, 265; economy of, 270; in 

 ancient times, 265; objections to, 

 on sandy soils, 270; wastefulness of, 

 271. 



Fallow soils, 267, 268; bacteria in, 273. 



Fallows arid aeration, 269; bare, 266, 

 270, 272; characteristics of, 267; 

 conservation of moisture in, 269; 

 elimination of, 267. 



Farms, abandoned, 271; sewage, 131. 



Farmyard manure, losses from, 306. 



Fats, 28. 



Fermented liquors, bacteria in, 458. 



Ferments (substances or organisms 

 capable of causing fermentation, 

 that is, chemical change in organic 

 materials, which is rather intense 

 in character), nitric, 171. 



Filter beds (masses of coke, broken 

 stone, clinkers, sand, and the like, 

 arranged in layers of varying de- 

 gree of fineness and employed for 

 the filtration of water or sewage), 

 8"2, 83. 



Filters, domestic, 86, 87, 121, 122; 

 efficiency and temperature, 120; 

 working capacity of, 124. 



Filtration of sewage, 116; of water, 

 81, 82, 83. 



Finishers (chemicals that may be used 

 to purify still further the filtered 

 sewage), 134. 



Fish, 440. 



Fisher, 50. 



Flagella (long, thread-like appendages 

 on the bodies of bacteria employed 

 as organs of locomotion), 17. 



Flax, bacteria in the preparation of, 

 456. 



Floats (finely ground raw phosphate 

 rock), 284, 285. 



Flora, bacterial, 165. 



Food, absorption of, by bacteria, 164; 



digestion of, by bacteria, 164; 

 products, pickling of, 439; require- 

 ments of bacteria, 30. 



Foods, exclusion of preservatives 

 from, 440; preservation of, and 

 bacteria, 431. 



Fore-milk, bacteria in, 360. 



Form and structure of bacteria, 13. 



Formaldehyde, use of, in milk, 393. 



Forcing effects of green-manures, 263. 



Forests, influence of, on bacteria in 

 air, 51. 



Fraser, 362. 



Freudenreich, 318, 418. 



Fruit, keeping quality of, and green- 

 manures, 261. 



Galactase (an enzyme found in cow's 

 milk, and of considerable impor- 

 ance in the ripening of cheese), 

 419, 422. 



Gammelost, 422. 



Gayon, 184. 



Gelatine, use of, in plate methods, 9 



Germicidal power of milk, 382, 383. 



Germicides (chemical substances de- 

 structive to bacteria even when 

 used in comparatively small 

 amounts), 42. 



Gilbert, 193, 209, 211. 



Giltay, 184. 



Glycogen (a kind of sugar found in 

 the liver, and, also, in some species 

 of bacteria), 27. 



Goodwin, 310. 



Gorgonzola, 422, 426. 



Granluose (a starch-like substance 

 found in some species of bacteria). 

 28. 



Green-manuring, 237; practice of, 242. 



Green-manures, 237; accumulation of 

 nitrogen by, 261; decomposition of 

 in the soil, 255; depth of covering 

 of, 259; draught on soil-moisture, 

 244; effect of on keeping quality 

 of fruits, 261; on soil bacteria, 

 244, succeeding crops, 247, 259; 



