CONTENTS. 
Page 
Summary 5 
Introduction 8 
Source of material 8 
Scope of the work 9 
Method of examination 10 
Preliminary report 11 
Acknowledgments 11 
Frequency of infection 11 
Concurrent infections 11 
Relative frequency of the different parasites 12 
Race 13 
Sex 16 
Age 23 
Significance of sex and of age as factors in the prevalence of intestinal worms 29 
Length of institutional life 33 
Significance of institutional life as a factor in the prevalence of intestinal worms.. . 36 
.Nativity 43 
History prior to admission to the hospital 46 
Place of residence 46 
Rural and city life 48 
Occupation prior to admission 49 
Military service 49 
Distribution of infections in wards and buildings 53 
Results of former investigations 64 
Relation of whipworms to typhoid fever 72 
Bibliography 74 
3 
