486 



Index and Glossary 



cal explanation of, 464; making, 

 463, 470, 472; pasteurization of, 

 472; storing of, 471. 



de Vries, 372. 



Virulence (the pronounced power of 

 bacteria to produce severe attacks 

 of disease. The term is also em- 

 ployed in the case of tubercle bac- 

 teria to denote a pronounced power 

 of tubercle-formation.), increase of, 

 218, 219; influence of nitration, 219. 



Voelcker, 311. 



Wagner, 185, 312, 321, 329, 330, 332, 

 335. 



Warrington, 116, 170. 



Water, alkali salts in, 78; alkaline, 78; 

 as a source of disease, 57; bacteria, 

 competition among, 69; bacteria, 

 in winter and summer, 69; charac- 

 ter of bacteria in, 62, 65; cisterns, 

 95, 96; composition of, 77; colon 

 bacillus in, 76; destruction of or- 

 ganic matter in, 67, 81; dilution of, 

 73; increase or decrease of bacteria 

 in, 64; in lakes and ponds, SS; num- 

 ber of bacteria in, 68; peaty, 78; 

 proportion of organic matter in, 66; 

 purification of, 84, 85, — by ozone, 

 86, — by the Woolf method, 86; 



quality of organic matter in, 78; 

 relation of, to health and disease, 

 56; self -purification of, SO; sewage 

 bacteria in, 61; sewage contamina- 

 tion of, 73, 74; shed, inspection of, 

 100; soil bacteria, in 61; storing of, 

 68, 81; supplies, ancient, 66, — 

 bacteriological examination of, 102, 

 — chemical examination of, 100, — 

 sanitary examination of, 99; table, 

 92; well-, bacteria in, 90, — bright- 

 ness of, 91, — number of bacteria 

 in, 94, — pollution of, 91, — ty- 

 phoid mortality from, 90. 



Waxes. 28. 



Wells, artesian, 95; deep, 93; driven, 

 94. 



Wickstead, 106. 



Wilfarth, 211, 212. 



Wine, mannitic fermentation of, 461; 

 ropiness in, 459, 460; turning of, 

 458. 



Winogradsky, 171, 195, 197, 198. 



Wollny, 268. 



Woolf method. 86. 



Woronin, 212. 



Wutrich, 318. 



Wygert, 9. 



Yeasts, 444; in vinegar, 470. 



