PREFACE 
TN 1 90 1 trypanosomes were discovered in the blood of a European by 
Dr. J. E. Dutton, Walter Myers Fellow, while on an Expedition 
of the Liverpool School of Tropical Medicine to Gambia. In 
consequence of this observation an Expedition composed of Drs. Dutton 
and Todd was sent in 1902 bv the School to Senegambia to prosecute 
farther researches in trypanosomiasis. The detailed report of the 
Expedition was published in 1903, and contained a study of the pathogenic 
trypanosomata of man and animals, several new species being described. 
Prior to the return of this Expedition, the discovery of trypanosomes 
in the cerebro-spinal fluid of cases of Sleeping Sickness in Uganda bv 
members of the Sleeping Sickness Commission of the Royal Society caused 
the subject of trypanosomiasis to assume great importance. At the same 
time it was brought to the notice of the Committee of the Liverpool 
School that in the Congo Free State the native population had from time 
to time suffered from very fatal epidemics of this disease. The Committee 
therefore decided to accept the invitation of His Majesty King Leopold to 
send an Expedition to study Sleeping Sickness in that country. Drs. 
Dutton and Todd were recalled from the Senegambia, and as soon as they 
had drawn up their reports they left for the Congo in September, 1903, 
and were soon after joined by Dr. Christy, who had served previously on 
the Royal Society's Sleeping Sickness Commission in Uganda. On reaching 
the Congo the Expedition decided to make Leopoldville its headquarters 
The authorities of the Free State at the same time attached Dr. Inge 
Heiberg, an old pupil of the School, to the Expedition, and to him the 
members are greatly indebted for his aid in the work. A special hospital 
was erected by the State, in order that the observers might have the 
Sleeping Sickness cases under their care, and facilities were given for the 
study of a large number of patients. The results of these investigators are 
incorporated in the present volume, and illustrate the occurrence and 
distribution ; describe the symptoms of trypanosomiasis in all its stages, 
both in Europeans and natives, and shew how Sleeping Sickness, so-called, 
is related to trypanosomiasis as a symptom of that disease. 
