Professor Sewall,[A] from whose account much of this memoir has been derived, remarks: "In the last letter which I ever received from him, he observes: 'I have just concluded the publication of the translation of Levasseur's account of Lafayette's progress through the United States, which will appear next week. My health has for the last week or two been very good, for me, since, notwithstanding my rather excessive application during this time, I continue to do well. My cough and expectoration are sufficiently troublesome; but by light diet, and avoiding all irritation, I have but very little trouble from night sweats, and generally sleep tolerably well. To-morrow I must resume my pen to complete some articles of zoology for the Encyclopedia Americana, now preparing in Boston. It shall be my constant endeavour to husband my strength to the last; and, by doing as much as is consistent with safety for the good of my fellow-creatures, endeavour to discharge a mite of the immense debt I owe for the never-failing bounties of Providence.'" [A] "An Introductory Lecture delivered November 1st, 1830, by Thomas Sewall, M. D., Professor of Anatomy and Physiology in the Columbian College, District of Columbia." He did husband his strength, and he toiled with his pen almost to the last hours of his life; and by thus doing has furnished us with a singular evidence of the possibility of uniting the highest attainments in science, and the most ardent devotion to letters, with the firmest belief and the purest practice of the Christian. But the period of his dissolution was not distant: the summons arrived; and conscious that the messenger, who had been long in waiting, could not be bribed to tarry, he commended his little family in a fervent prayer to Him who has promised to be the 'Father of the fatherless, and the widow's God,' and then, with uplifted eyes and hands, and a face beaming with joy and confidence, resigned his spirit into the arms of his Redeemer, on the morning of the 17th of Fourth month, 1830. A friend who was his constant companion during his sickness, and witnessed his last moments, writes thus: