CONTENTS 
PAGE 
I. Human Trypanosomiasis on the Congo (First Progress Report) . i 
II. Human Trypanosomiasis and its Relation to Congo Sleeping Sickness 
(Second Progress Report) . . . . . . . 13 
(1) Prevalence or Human Trypanosomiasis . . . . . 14 
Types of Human Trypanosomiasis ...... 14 
Type 'A' 15 
Type ' B ' . . . . . . . . . . 17 
Type ' C ' 20 
(2) T. Gambiense as probable cause of Congo Sleeping Sickness . 33 
Conclusions ......... 33 and seq. 
(3) Course of the Disease . . . . . . . . 35 
(4) Secondary Infections and Complications . . . . . 36 
(5) Observations on the Parasite . . . . . . . 37 
(a) Symptoms associated with presence of Parasites in the Blood 41 
(b\ Occurrence of Parasites in Serous Fluids . . . . 41 
(t ) Occurrence of Parasites in Tissues and Fluids after Death . 42 
(d) Occurrence of Parasites in Cerebro-Spinal Fluid ... 42 
(6) Animal Experiments ........ 44 
(7) Transmission Experiments ....... 45 
III. The Congo Floor Maggot ........ 49 
IV. The Cerebro-Spinal Fluid in Sleeping Sickness . . . . . 57 
V. A Comparison of the Animal Reactions of the Trypanosomes of Uganda 
and Congo Free State Sleeping Sickness, with those of Trypanosoma 
Gambiense (Dutton) ......... 75 
VI. Two Cases of Trypanosomiasis in Europeans ..... 89 
VII. Supplemental Notes on the Tsetse-Flies . . . . . .101 
