About that time Mr. Alexander H. Stephens published in one of the more dignified periodicals of the time--the _North American Review_, perhaps--a very learned essay in which he sought to fix the authorship of the letters of Junius upon Sir Philip Francis. Mr. Stephens brought to the discussion a ripe scholarship and a deal of fresh and original thought that gave importance to his paper, and I reviewed it in the _Evening Post_ as carefully and as fully as if it had been a book.
I was deeply concerned to have my review of so important a paper in all respects the best I could make it, and to that end I read my proofs twice, with minute attention, as I thought, to every detail.
The next day, if I remember correctly, was Sunday. At any rate, it was a day on which I remained at home. When I opened my morning newspapers, the first thing that attracted my attention was a letter in one of them from Richard Grant White, of which my article was the subject. Here, he said, was a conspicuous and unmistakable example of heterophemy, which could not be attributed to ignorance or inattention or anything else, except precisely that tendency of the human mind which he had set forth as the source of mistakes otherwise unaccountable. He went on to say that mine was an article founded upon adequate scholarship and evidently written with unusual care; that its writer obviously knew his subject and had written of it with the utmost attention to accuracy of statement in every detail; that he had evidently read his proofs carefully as not a slip appeared in the printed copy of the article, not even so much as a typographical error; and yet that in two or three instances this careful critic had written "Sir Philip Sidney" instead of "Sir Philip Francis." He pointed out that these slips could not have been due to any possible confusion in my mind of two Sir Philips who lived two hundred years apart, chronologically, and whose careers were as wholly unlike as it was possible to conceive; for, he pointed out, my article itself bore ample witness to my familiarity with Sir Philip Francis's history. Here, Mr. White insisted, was the clearest possible case of heterophemy, untainted by even a possible suspicion of ignorance or confusion of mind. Further, he urged, the case illustrated and confirmed his contention that, having written a word or name or phrase not intended, the writer is extremely unlikely to discover the slip even in the most careful reading of proofs. For in this case every appearance indicated a careful proofreading on the part of the author of the article.