JAMA. 1913;61(15):1350-1354. doi:10.1001/jama.1913.04350160012004.
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A larger number of severe rachitis deformities of the legs have been rapidly corrected by bloodless osteoclasis in Chicago than in any half dozen other cities in the world. The records of the Chicago free orthopedic hospitals and dispensaries show that the new immigrant gives them eight times their normal ratio of rachitic deformities, four times their normal ratio of tuberculous deformities. Chicago is perhaps the only city in the world having winters of ice and snow that harbors twenty thousand new emigrants from tropical or semitropical countries every year, and very bad rachitic deformities are almost peculiar to the children of recent immigrants from hot to cold climates.

The people from Northern Europe huddle closely. Their children double our tuberculous joint deformities. The german and Russian Jew girls are especially prone to scoliosis. Dr. Peter Roberts, in his book1 presents a map of the United States, with a line drawn from Atlantic City to Cairo, Ill., and thence to the northwest


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