CONTENTS. 
Page. 
I. The presence of tubercle bacilli in the circulating blood in clinical and 
experimental tuberculosis 7 
Introduction 7 
Technique employed in the collection and examination of the blood 9 
Blood from cases of human tuberculosis 10 
Blood from rabbits experimentally infected 15 
Blood from guinea pigs experimentally infected 17 
Summary and discussion 20 
IT. The viability of the tubercle bacillus 25 
The tubercle bacillus and its supposed spore 25 
The tubercle bacillus and its waxy substance 26 
Acid-fast property 26 
The true position of the tubercle bacillus 27 
Criterion of death 28 
An explanation of discrepancies in published reports 29 
The short life of cultures contrasted with the long life under unfavorable 
conditions 30 
The thermal death point 30 
Viability in dried sputum 32 
The effect of sunlight 33 
The tubercle bacillus in water 34 
Summary 36 
Bibliography 37 
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