ADVERTISEMENT.

The Author avails himself of this advertisement, to acknowledge his obligations to those authors from whose works he has benefited in the composition of this Treatise.

In the FIRST PART, he is chiefly indebted to the "Essay on the Causes of the Variety of Complexion and Figure in the Human Species" by Dr SMITH OF PHILADELPHIA.

In the SECOND PART, he is under great obligations to "The Works" of PROFESSOR CAMPER OF FRANIKER, and the Treatise "De Generis Humani Varietate Nativa" of PROFESSOR BLUMENBACH OF GÖTTINGEN.

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In the THIRD PART, the Physiologist alluded to, is MR WALKER, LECTURER ON ANATOMY AND PHYSIOLOGY, AT EDINBURGH.

In the FOURTH PART, his obligations are to the Lectures of THE SAME PHYSIOLogist.

In the FIFTH PART, the Application of the preceding principles to the Passions, as expressed by Camper and Le Brun, is more especially his own.

Throughout, he has adopted that arrangement which seems to him most systematic and impressive; and he has introduced whatever observations appeared to him to render the subject more complete.