It was there, in Boston, that smallpox inoculation had been introduced in America more than half a century earlier, and by a kinsman of Adams, Dr. Zabdiel Boylston, Adams’s great uncle on his mother’s side. The idea had come from a slave belonging to Cotton Mather, an African named Onesimus, who had said the practice was long established in Africa, where those with the courage to use it were made immune, and he had his own scar on his arm to show. The technique, the same as still practiced by Dr. Boylston, was to make a small incision, then with a quill scoop the “pus from the ripe pustules”
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