XIV TABLE OF COXTEXTS. 



PAGE 



§ II. Experiments on blood and urine taken in their normal state, 

 and exposed to contact ■with air that has been deprived of 

 the particles of dust which it generally holds in suspension . 40 



§ in. Experiments on the juice contained in grapes .... 54 



§ lY. Wort and must exposed to common air 59 



§ V. New comparative studies on the germs held in suspension by 

 the air of different places which are near each other, but 

 subjected to different conditions affecting the production and 

 diffusion of the particles of dust found in them . . .72 



§ VI. Yeast may become dry and be reduced to dust without losing 



its faculty of reproduction 81 



CHAPTER IV. 



THE GEOWXII OF DIFFERENT OllGANISMS IX A STATE OF PUKITX : 

 THEIR AUT0X03IY. 



§ I. Growth of PeniciUium fjlaucum and Asperf/illus (jlauciis in a 

 state of purity. — Proofs that these fimgoid gro-n-ths do not 

 become transformed into the alcoholic ferments of beer or 

 wine. — Preliminary inquirj' into the cause of fermentation . 86 



§ II. Growth of Mijcoderma vini in a state of purity. — Confirmation 

 of our original conjectures as to the cause of fermentation. — 

 Ilycodenna villi does not change into yeast, although it may 

 give rise to fermentation . . . . . . .108 



§ III. Growth of Mycinlcnna acdi in a state of purity . . .121 



§ IV. Growth of Mucor raccmosus in a state of purity. — Example of 

 life more active and lasting when removed from the influence 

 of air 127 



CHAPTER V. 



THE ALCOHOLIC FER:MEXTS. 



§ I. On the origin of ferment 



§ II. On " spontaneous " ferment 



§111. On " high " and " low " ferments 



§ IV, On the existence and production of other species of ferment 



§ V. On a new race of alcoholic ferments : Aerobian ferments 



§ VI. The purification of commercial yeasts .... 



14;} 



182 

 18G 

 19() 

 205 

 211) 



