REPORT OF AN EXPEDITION TO PARA, BRAZIL, 
TO STUDY YELLOW FEVER 
PREFACE 
The sad loss of my comrade, Walter Myers, after some nine months of 
constant companionship, though already engraved on the records of scientific research 
and adventure, cannot be passed over in silence. Shortly before we were struck, 
almost simultaneously, with the fever, we had agreed to confine our attention to a 
short programme, which would possiblv have allowed us to return home some 
two months later. This, however, was not to be. The defects of this report will be 
a tribute to the lack of his friendly criticism, and the omissions would have been 
fewer had his energy and ability been available for continuing our observations nearer 
to the stage of completeness. 
A more pleasurable task is to record the appreciation of, and gratitude to, those 
from whom we received assistance in the furthering of our aims. First and foremost 
is due our thanks to Dr. Jose Paes de Carvalho, whose constant solicitude for our 
welfare, both in health and sickness, and whose position as the worthy Governor of 
the State of Para rendered the prosecution of our researches possible. 
To Dr. Pontes de Carvalho, Director of the Hospital Domingos Freire, 
which is reserved for the treatment of yellow fever patients, is due our thanks for 
allowing us all facilities in obtaining material from the cases under his charge. 
Dr. Francisco Miranda, of the Sanitary Service, and several of the doctors in 
charge of the hospitals afforded us aid. 
Mr. C. L. Temple (Acting British Consul), Mr. Beale (of Messrs. Singlehurst, 
Brocklehurst & Co.), and Captain Crimp and Mr. Collard (of Messrs. Booth & Co.) 
also lent us their aid, often, be it said, at much personal inconvenience ; we were 
much indebted to these gentlemen for their invaluable help. 
Arriving in Para on August 24, 1900, we were unable to commence for some 
weeks owing to the hebetude of the Custom House officials in the release of our 
apparatus, which had arrived some two weeks before us, and which eventually was 
liberated on September 13. We were able to obtain fifteen autopsies on yellow fever 
cadavers up to January 15, when work was interrupted by our own infection. After 
my return, on February 15, the prevalence of the fever had diminished so much that 
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