But he himself long survived his friend Mr. Hume. The persons entrusted with his remaining papers were Dr. Black and Dr. Hutton, his executors, with whom he had long lived in habits of the closest friendship. These gentlemen afterwards collected into a volume, such of the writings of Dr. Smith as were fitted for publication: and they appeared in 1795, under the title of _Essays on Philosophical Subjects_. These essays had been composed early in life, and were designed to illustrate the principles of the human mind, by a theoretical deduction of the progress of the sciences and the liberal arts. The most considerable piece in this volume is, on the principles which lead and direct philosophical inquiries, illustrated by the history of astronomy, ancient physics, and ancient logic and metaphysics. The others, with the exception of an essay on the external senses, relate to the imitative and liberal arts. The contents of this volume, Mr. Smith's executors observe, appear to be parts of a plan he once had formed for giving a connected history of the liberal sciences and elegant arts; but which he had been obliged to abandon, as being far too extensive; and these parts lay beside him neglected till after his death. In them, however, will be found that happy connection, that full and accurate expression, and the same copiousness and facility of illustration, which are conspicuous in the rest of his writings. As a writer, the character of Mr. Smith is so well known, that any observation on his merits, must appear almost unnecessary. His literary fame is circumscribed by no ordinary limits. To the voice of his own country, is added the testimony of Europe, and, indeed, of the civilized world. And had even only one volume of his inestimable writings appeared, his name would have been carried down to posterity in the first rank of those illustrious characters that adorn the last century. In the words of Professor Stewart, it may be said, that,--of the intellectual gifts and attainments by which he was so eminently distinguished;--of the originality and comprehensiveness of his views; the extent, the variety, and the correctness of his information; the inexhaustible fertility of his invention; and the ornaments which his rich and beautiful imagination had borrowed from classical culture;--he has left behind him lasting monuments. One observation more may he added to what is now said on his writings, that, whatever be the nature of his subject, he seldom misses an opportunity of indulging his curiosity, in tracing, from the principles of human nature, or from the circumstances of society, the origin of the opinions and the institutions which he describes.