the iron-clad "Merrimac," and was wounded in the conflict of that vessel with the monitor "Ericsson," at Hampton Roads, March 9, 1862, and was later captured by Admiral Farragut in Mobile harbor.

"My brother," writes one of the grandsons, "told me that the last time he saw Henry Clay, Mr. Clay took his hand in both of his and said, with great emphasis: 'It is to your grandfather that I owe my present position with regard to slavery. It was he who first pointed out to me the curse it entailed on the white man, and the manifold evils it brings with it.'"

In determining how far the sentiments contained in this oration were the current opinions of the time, it became necessary for me to know something definite of the "Maryland Society for the Abolition of Slavery," of the Virginia, the Pennsylvania, and other societies, which existed at that time. This information I could not obtain from anti-slavery books, or from the most prominent abolitionists whom I consulted. The matter seemed to have been forgotten, and it was the common idea that there was nothing worth remembering of the anti-slavery movement before 1830, when Mr. Garrison and his radical friends came upon the stage in Boston. For the want of the facts I needed, I laid aside the idea of reproducing the tract. The subject was brought again to mind by hearing the excellent paper, by Mr. S. E. Wright, our secretary, on the anti-slavery labors of Benjamin Lundy, which he read to this Club, a few months ago. The labors of Mr. Lundy began in 1816, and ended with his death in 1839. Quite recently I have obtained much of the information I needed.

Among the unknown facts to which I could get no clue at the time I have mentioned, were the names of the "Virginia Calculator" and the "Physician of New Orleans," whom Dr. Buchanan mentions with Phillis Wheatley, Ignatius Sancho, and Banneker, the Maryland astronomer, as being negroes who were distinguished for their literary and mathematical acquirements. Mr. Phillips had never heard of them, and he took the trouble to make inquiries among his anti-slavery friends, but without success.

A year or more after I had abandoned my little project, in looking over the files of the Columbian Centinal, printed in Boston, for 1790, I found under the date of December 29th, in the column of deaths, the following:

"Died—Negro Tom, the famous African calculator, aged 80 years. He was the property of Mrs. Elizabeth Cox, of Alexandria. Tom was a very black man. He was brought to this country at the age of fourteen, and was sold as a slave with many of his unfortunate countrymen. This man was a prodigy. Though he could neither read nor write, he had perfectly acquired the use of enumeration. He could give the number of months, days, weeks, hours, and seconds, for any period of time that a person chose to mention, allowing in his calculations for all the leap years that happened in the time. He would give the number of poles, yards, feet, inches, and barley-corns in a given distance—say, the diameter of the earth's orbit—and in every calculation he would produce the true answer in less time than ninety-nine out of a hundred men would take with their pens. And what was, perhaps, more extraordinary, though interrupted in the progress of his calculations, and engaged in discourse upon any other subject, his operations were not thereby in the least deranged; he would go on where he left off, and could give any and all of the stages through which the calculation had passed.

"Thus died Negro Tom, this untaught arithmetician, this untutored scholar. Had his opportunities of improvement been equal to those of thousands of his fellow-men, neither the Royal Society of London, the Academy of Science at Paris, nor even a Newton himself need have been ashamed to acknowledge him a brother in science."

This obituary was doubtless extracted from a Southern newspaper. A fact once found is easily found again. I have come across the name of this unlettered negro prodigy many times since, with the substance of the facts already stated. In a letter which Dr. Benj. Rush, of Philadelphia, addressed to a gentleman in Manchester, England, he says that, hearing of the astonishing powers of Negro Tom, he, in company with other gentlemen passing through Virginia, sent for him. A gentleman of the company asked Tom how many seconds a man of seventy years, some odd months, weeks, and days had lived. He told the exact number in a minute and a half. The gentleman took a pen, and having made the calculation by figures, told the negro that he must be mistaken, as the number was too great. "'Top, massa," said the negro "you hab left out de leap years." On including the leap years in the calculation, the number given by the negro was found to be correct.[4]

That Dr. Buchanan did not mention his name is explained by the fact that he died only six months before; and the audience, who had doubtless read the obituary notice just recited, or a similar one, knew who was meant. Besides, he was a native African, and had no name worth having. He was only Negro Tom. In Bishop Grégoire's work, however, he is ennobled by the by the name of Thomas Fuller, and in Mr. Needles' Memoir the name of Thomas Tuller.[5]

Why Dr. Buchanan should have omitted to mention the name of "the New Orleans physician" does not appear, unless it be that he was equally well known. His name, I have found recently, was James Derham. Dr. Rush, in the American Museum for January, 1789, gave an account of Dr. Derham, who was then a practitioner of medicine at New Orleans, and, at the time the notice was written, was visiting in Philadelphia. He was twenty-six years of age, married, member of the Episcopal Church, and having a professional income of three thousand dollars a year. He was born in Philadelphia a slave, and was taught to read and write, and occasionally to compound medicines for his master, who was a physician. On the death of his master he was sold to the surgeon of the Sixteenth British regiment, and at the close of the war was sold to Dr. Robert Dove, of New Orleans, who employed him as an assistant in his business. He manifested such capacity, and so won the confidence and friendship of his master, that he was liberated on easy terms after two or three years' service, and entered into practice for himself. "I have conversed with him," says Dr. Rush, "upon most of the acute and epidemic diseases of the country where he lives. I expected to have suggested some new medicines to him, but he suggested many more to me. He is very modest and engaging in his manners. He speaks French fluently, and has some knowledge of the Spanish."[6]

It was unfortunate that these incidents had not occurred early enough to have come to the knowledge of Mr. Jefferson before he wrote his "Notes on Virginia." These were precisely the kind of facts he was in quest of. He probably would have used them, and have strengthened the opinions he there expressed as to the intellectual capacity of the negro race.

His "Notes on Virginia" were written in 1781-2. His condemnation of slavery in that work is