ADVERTISEMENT TO THE THIRD EDITION. THE present Edition will, I trust, be found an improvement upon the previous one. In consequence of the correction of a number of errors, which it is difficult to avoid even in the most carefully elaborated works, it lays claim to greater accuracy, and has, besides, the advantage of containing a variety of new illustrations, which it is hoped will elucidate the subject more clearly. The work now contains as good an account of Sleep as I am |