INDEX. 



563 



Xerosis bacillus, 335 



Yeast, 385 



baker's or brewer's, 394 



black, 398 



colonies, appearance, 386 



culture of, 394 



enzymes of, 97, 396 



multiplication of, 385 



red, 388, 398 



relation to bacteria, 385 



moulds, 386 



pathogenic action, 388 



Yeast, 



upper and lower, 387 



white, 398 



wild, 97, 387 

 Yellow fever, 356, 383 



sarcine, 210 



Ziehl-Neelsen method, 324, S43 

 Ziehl's solution, 292 

 Zooglea, 28, 99, 104 

 Zymase, 396 



Zymogenic bacteria, 93, 95, 113 

 Zygospores, 390 



