CONTENTS 



PAGE 



GENERAL CONSIDERATIONS RELATIVE TO THE BACTERIAL 

 FLORA OF THE HUMAN DIGESTIVE TRACT IN 



HEALTH 1 



Defensive Action of the Digestive Juices ... 6 

 On the Antagonism between B. coli communis and Other 



Microorganisms 7 



Criticism of Experiments of Conradi and Kurpjuweit 17 

 Influence of Reaction on the Growth and Products of 



Intestinal Anaerobes ...... 21 



Aerobic and Anaerobic Conditions in the Digestive Tract 23 

 The Bacteria of the Human Digestive Tract at Different 



Ages in Apparently Healthy Individuals . . 35 



THE BACTERIAL PROCESSES IN THE DIGESTIVE TRACT OF 



NORMAL NURSLINGS AND BOTTLE-FED INFANTS 37 

 Nursling Infants ........ 37 



Distribution of the Bacterial Flora in the Digestive 



Tract of the Nursling 48 



The Infection of the Nursling's Digestive Tract and 

 the Relation of the Microorganisms to the Perma- 

 nent Bacterial Flora 53 



Bacterial Flora of Bottle-fed Children . . . .59 

 Products of Decomposition in the Intestinal Tract of 



Bottle-fed Children 64 



Action of the Mixed Faecal Flora upon Various Media 66 



THE BACTERIAL CONDITIONS IN THE DIGESTIVE TRACT 

 DURING CHILDHOOD, ADOLESCENCE, ADULT LIFE, 



AND SENESCENCE 69 



Period of Childhood and Adolescence . . . .69 



Period of Adult Life 72 



Period of Senescence . .75 



