Two years ago, Drs. E. A. Graham, G. H. Gopher and W. H. Cole, all of the Washington University Medical School, St. Louis, began research to make possible visualization of the gallbladder by use of the Xray. They found that certain salts injected into the body are eliminated through the bile, which is stored in the gallbladder. They knew that iodin and bromin salts are opaque to the Roentgen ray. They secured a combination of these salts and obtained X-ray pictures of the abdomen in which the gallbladder, previously invisible because of soft tissue,...
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