It was invariably his practice before attempting an operation on a living subject to perform it on a dead body, and by the most minute and patient examination to render himself absolute master of the anatomy of the parts to be operated upon. He was a thoroughly conscientious man in the exercise of his profession, and was always on his guard to resist that greatest danger of the skillful surgeon—the temptation to use the knife needlessly. It was his practice to investigate his cases thoroughly, and never to use the knife unless his judgment was satisfied that an operation was necessary. "That he decided in favor of operating when some of his associates hesitated, was due rather to his large experience than to an overweening fondness for the use of the knife." In his operations he was firm and decided. Gifted with an unusual steadiness of nerve and strength of muscle, he never allowed his sympathy for the patient to cause him to hesitate or inflict one pang less than the case required. He was prompt and ready in the event of unforeseen complications, and never permitted any thing to take him by surprise. His manner toward his patients was tender and sympathizing to a remarkable degree, and his brother surgeons used to say of him, that he seemed to have the power of cutting with less pain to the patient than was possessed by most operators. During forty years of his practice anæsthetics were unknown, and he had to operate with the full consciousness that his patient was suffering the keenest agony. Besides attaining such an exalted position as a surgeon, Dr. Mott won an enviable reputation as a physician. His practice was confined almost entirely to the best class of the people of New York, and he was for many years the favorite accoucheur in a large circle of families in that city.

He was an eminently progressive man. He fully recognized the advance of science with the growth of the world, and was always prompt to welcome any valuable discovery in medicine or surgery. He was among the first to adopt and advocate the use of anæsthetics, for no man had had more cause to understand the necessity of such assistants. He was himself the inventor of many valuable surgical instruments, but he gladly welcomed the introduction of others, even though they superseded his own in use. To the close of his life he was a diligent student, and watched the progress of his science with a keen and intelligent eye. He was the author of several works of merit, including a volume of travels, and the translator of "Velpau's Operative Surgery," to which he made extensive and valuable additions and annotations. He received numerous literary and scientific honors from colleges, universities, and learned bodies in the United States and Europe.

In 1835 he visited Europe for the purpose of resting from his arduous labors, and spent several years in traveling extensively in England, on the continent, and in the East. His great achievements had made him as famous in the Old World as at home, and he was received wherever he went with great distinction. He was cordially welcomed by the most eminent surgeons of Paris, and Louis Philippe conceived a warm friendship for him. During his visit to Constantinople, he was called upon to attend professionally the reigning Sultan Abdul Medjid, who was suffering from a tumor in the head. Dr. Mott successfully removed this tumor, and was afterwards invested by the Sultan with the order of Knight of Medjidechi, of Constantinople.

During his visit to Paris, a circumstance occurred which he related upon his return home, and which will serve to show the extremes to which professional skill and vanity will sometimes carry men. One of the most eminent surgeons in Paris asked him if he would like to see him perform his original operation. Dr. Mott replied that nothing would give him more pleasure. "Then you shall see it to-morrow," said the Frenchman. "But stay," he added, "now I think of it, there is no patient in the hospital who has that malady. No matter, my dear friend, there is a poor devil in ward No. —— who is of no use to himself or any body else, and if you'll come to-morrow, I'll operate beautifully on him." Dr. Mott at once declined to attend the operation or to countenance in any way so horrible an outrage.

In person Dr. Mott was a thorough gentleman of the old school. He was an exceedingly handsome man, and was possessed of an erect and well-developed figure. His hair was as white as snow, and his dress, which consisted of a simple suit of spotless black, with linen of matchless purity, was in the most perfect taste. He was grave and dignified in his deportment, and polished and courteous in every action. Even in his most difficult and trying operations the services of the assistants were always promptly acknowledged with scrupulous politeness. He was possessed of many friends, and was regarded with pride and veneration by his profession throughout the world.

During the last winter of his life he had lectured once or twice at the Medical School, and had performed several operations of importance in his private practice. Although nearly eighty, he was still erect and vigorous, and was far from considering himself too old for his work.

On the morning of the 15th of April, 1865, he sent for his barber, as was his custom, and submitted himself to the hands of the man who had been his attendant in this capacity for years. He was sitting in his dressing-room, and, being in fine spirits, began conversing with the barber, who, during the conversation, asked him if he had heard the terrible news of the day.

"What is the news?" asked the doctor.

"President Lincoln was killed last night at the theater in Washington," was the reply.

The doctor turned as pale as death, and, trembling violently, motioned the barber aside, and tottered into the chamber adjoining, in which his wife was dressing.