MAP-CHANGING MEDICINE 



823 



TESTIMONIALS OE NATIVE PHYSICIANS IN CHENGTU, CHINA 



making the world safe from the domina- 

 tion of the Huns of contagion, invited the 

 foremost sanitarians of North America 

 to cooperate with the. municipality in a 

 final drive for the extermination of the 

 malady. 



The invitation was accepted, and Amer- 

 ican, Latin, and Nipponese fought shoul- 

 der to shoulder in a stirring battle for the 

 last stronghold of Yellow Jack, with the 

 result that in less than a year's time the 

 last case of yellow fever was cured ; and 

 in less than two years all danger of its 

 recurrence was past. 



For the first time in three-quarters of 

 a century Guayaquil was a port against 

 which the world no longer needed to set 

 up the bars of quarantine. 



Guayaquil's resolution to rid itself of 

 the Old Man of the Sea of disease, that 

 had sat astride its neck for the better part 

 of a century, had another and a far- 

 reaching result. The city's spirited co- 

 operation made it possible to stage a 

 thorough bacteriological campaign for the 

 definite identification of the invisible foe 

 that causes yellow fever, and, following 



its identification, to make a serum that 

 would defeat the efTorts of the micro- 

 scopic creature to perpetuate itself. 



Hitherto it had succeeded in eluding the 

 most unrelenting quest for it. The bac- 

 teriologists knew that it passed from the 

 blood of a yellow-fever patient into the 

 bill of a female Stegomyia mosquito, 

 thence into her stomach, where it was in- 

 cubated, and thence again through her bill 

 into the blood of a well person, where it 

 multiplied and caused yellow fever. 



But it was too elusive for microscopic 

 or filter detection, and only through the 

 finest work that had ever been done in a 

 laboratory could science hope to find it. 



The man selected for the task of dis- 

 covering it was that Sherlock Holmes of 

 Bacteriadom, Dr. Hideyo Xoguchi, the 

 eminent Japanese scientist, now a mem- 

 ber of the staff of the Rockefeller Insti- 

 tute for Medical Research. He went 

 to Guayaquil to cooperate with the local 

 bacteriologists, and soon they were hot on 

 the trail of the elusive little sniper. 



Using a system of "dark-field illumina- 

 tion," whereby none of the direct rays of 



