532 



MICROORGANISMS IN WATER 



Yeast forms, action of light on, 347 

 Yeast pink (' Rosa Hefe '), vitality 



in seltzer- water, 240 

 ' Yellow ' Bacillus (Lustig), 446 

 Yellow pigment, bacteria producing 



a, 444-449, 482, 483, 484, 498, 



503, 506, 507, 509 



Ziehl's solution, 46 



Zopfii, B., 457 



Zurich, Lake of, bacteria in, 97, 110, 



146 

 water supply, 144-147 



typhoid fever and, 147 

 Ziirnianum, B., 487 



rUlNTED BY 



riFOTTLsWOODE AND CO., NEW-STREET SQUARE 

 LONDON 



