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Credit
Reply to Dr. James Carmichael Smyth : containing remarks on his letter to Mr. Wilberforce, and a further account of the discovery of the power of mineral acids in a state of gas to destroy contagion / by John Johnstone, M.D. Public Domain Mark. Source: Wellcome Collection.
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This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.