slight alterations and modifications have been made; but only such as I judged the worthy author would at once cheerfully admit. I have kept within the bounds of the liberty which he gave me; and I trust he will not be dissatisfied with what I have done. I command the serious perusal of the following Essay and Appendix to every man, who wishes to become well informed respecting the properties of tobacco. Whoever uses this substance as a luxury, is bound by a due regard to his own physical welfare to make himself acquainted with its properties and their influence. If any man can soberly peruse the following pages, without conviction that he is "playing with edge-tools," while he is indulging in the use of tobacco, I must confess his mind to be of a composition different from mine. One word as to _breaking off the habit_. The difficulty, I fully believe, is not much less than the breaking off from ardent spirits. But as to any danger to health in breaking off, the fear is idle; excepting in case of delicate habits, where small changes produce great effects; or in case of advanced years and inveterate habit, where the course of those fluids which are so much affected by tobacco, if suddenly and entirely changed, may give rise to serious inconvenience. My belief, however, is, _that there no case in which a judicious and proper course may not effect an entire weaning from the use of tobacco_. Most persons in good health, and all in younger life, may break off at once, without the least danger. Two or three days will overcome all difficulty. Those whom slight changes in regimen affect very much, may break off more gradually; and so of persons advanced in life. A good way of accomplishing this, is to procure some of the most detestable tobacco which can be found, and when appetite will not forego the use of it without an evil greater than to use it, then take it in such a quantity as will be sure to nauseate and prostrate. This will put the next dose farther off; and two or three doses thus administered, will so blunt the appetite, that quitting the practice will appear to be quite a moderate degree of self-denial. Those who never felt the appetite may laugh at such directions as these; but those who know its power, will at least think them worth some consideration.