PREFACE 
Four months ago we were in possession of the main facts stated in this 
paper. Illness and death retarded the gathering of information and the 
recording of our observations. It is only now possible to publish a part of 
our work. At the end of November we both fell ill with recurrent fever. 
Dr. Dutton's illness was severe, and it was not until the middle of January 
that his convalescence obviously began. Unfortunately, he over-rated his 
strength, and even before his fever subsided commenced once more to work, 
'harder and for longer hours than ever. On the twenty-first of February 
his fatal illness commenced, the twenty-seventh of February he died, after 
four days' unconsciousness. 
For almost a year and a half Dr. Dutton and I have worked together in 
the Congo. This communication represents only a small part of the results 
of our observations. Other reports, based on our common work, must soon 
be written by me alone. 
May any weakness in all be recognised as mine, and in nowise due to 
my absent comrade. 
J. L. T. 
KASONGO, March 28, 1905.* 
* On March 24, 1905, we received the " British Medical Journal " for November 26, 1904. containing 
the note of Ross and Milne on tick-fever. They are to be congratulated on their discovery. The present 
paper will help to complete their observations. 
