The above lines, indebted for their existence to the perusal of this little work, were sent to the Author just previous to his departure to Germany, in search of the blessing of improved eyesight; and they appeared, to the individual to whom the superintendence of this edition has been entrusted, so beautiful in themselves, and so apposite to the subject matter, that he has ventured to insert them here, a liberty, which he feels convinced their author will readily excuse.--[Ed.]