"<p>In the Middle Ages, there was a mistaken belief that doctors brought diseases to certain regions as part of their trade. Montesquieu overturned this misconception centuries later. Doctors do not bring diseases, diseases bring doctors. And indeed we see that every region has a different doctor. The remedy that has enthusiastic and clever adherents in Paris does not cure in Constantinople. The remedy that is sure to work in Oslo is not so sure to work in Marseilles or Budapest. The doctor who has revived thousands of patients in London is helpless in Baghdad if he is fated to be there. Man is sick and he heals not only according to his nature and habits but according to the cardinal points of the compass. What is a laxative in Helsingfors constipates in Khartoum, and a vascular spasm that dissolves surely in Budapest on a pyramidon remains a vascular spasm in China, no matter how many pyramidons the mandarin takes. Quinine is swallowed by the half-gram in Budapest, and by the teaspoon in Sumatra. One is sick or healthy under a wide variety of conditions. Think about that when you scold the doctor.</p>"