1042 



INDEX 



Variation in infection, 672 



in numbers of bacteria in soil, 368 



physiological, 253 

 Vegetables, chemical preservation of, 553 



food poisoning from, 587 



refrigeration of, 548 



sterilization of, 534 

 Vegetation, influence on organisms in 



water, 320 

 Venereal disease, control of, in London, 



Canada, 764 

 Vermicelli, 522 

 Vinegar, acetic fermentation, 636 



after-treatment of, 647 



apparatus for manufacture of, 641 



bacteria, 636, 638 



cultures for, 641 



diseases of, 647 



domestic method, 641 



fermentation of, 640 



film, function of, 647 



manufacture of, 639 



nature of, 636 



Orleans method, 642 



Pasteur method, 643 



rapid methods, 644 



raw materials of, 639 



rotating barrel method, 646 



starters for, 641 

 Vinegar-oxidase, 208, 214, 216 

 Virulence of infection, 674 

 Virus, attenuation of, 725 



filtrable, 66 1 



of flacherie, 935 



of sacbrood, 933 

 Vitamines, 194 

 Volutin, 45 



WALKER'S hyacinth disease, 979 

 Walnut blight, 963 

 Wassermann test, 708 

 Water, analysis (qualitative and quan- 

 titative), 321, 322 

 B. coli in, 313 

 enteritidis in, 313 

 typhosus in, 314 



Water, bacteria of natural, 311 

 Bact. lactis aerogenes in, 314 

 -borne infections, 666 

 classes of bacteria in, 311 

 coagulating basins, 324 

 decrease of organisms in, 319 

 dilution of, 320 

 filters, 323, 325 

 nitrations, 323, .324, 325 

 food influences, 319 

 from hail, germ content, 317 

 increase of organisms in, 319 

 lake, germ content, 318 

 light, influence of, 319 

 microorganisms in, 310, 311 

 Microspira comma in, 314 

 oxidation, influence on germ con- 

 tent, 320 



protozoa, influence on germ con- 

 tent, 320 



purification, by chemicals, 326 

 by heat, 326 

 by ozone, 325 



from rain, germ content, 316 

 from rivers, germ content, 318 

 sea water, germ content, 318 

 sedimentation of, 320, 322, 323 

 sewage streptococci in, 313 

 from snow, germ content, 317 

 soil bacteria in, 312 

 as source of infection, 666 

 supply for canning, 536 



for dairy, 441 

 surface washings in, 312 

 temperature, influence in, 319 

 in upland surface, 318 

 vegetation, influence on germ con- 

 tent, 320 

 from wells, germ content, 317, 326 



Wax fermentation, 378 

 in soil, 378 



Weathering process in soil, 417 



Weight of bacterial cell, 221 



Weisbiers, 622 



Wells, construction of, 326, 328 

 location of, 326, 327 



