_Fifthly_, It is his duty to _warn_ you against what is injuring your health. If he finds his patient has brought disease upon himself by sin, by drink, by overwork, by over-eating, by over-anything, it is his duty to say so plainly and firmly, and the same with regard to the treatment of children by their parents; the family doctor should forewarn them; he should explain, as far as he is able and they can comprehend them, the Laws of Health, and so tell them how to _prevent disease_, as well as do his best to _cure_ it. What a great and rich field there is here for our profession, if they and the public could only work well together! In this, those queer, half-daft, half-wise beings, the Chinese, take a wiser way; they pay their Doctor for keeping them well, and they stop his pay as long as they are ill! _Sixthly_, It is his duty to be _grateful_ to you; 1st, for employing him, whether you pay him in money or not, for a Doctor, worth being one, makes capital, makes knowledge, and therefore power, out of every case he has; 2dly, for obeying him and getting better. I am always very much obliged to my patients for being so kind as to be better, and for saying so; for many are ready enough to say they are worse, not so many to say they are better, even when they are; and you know our Scotch way of saying, "I'm no that ill," when "I" is in high health, or, "I'm no ony waur," when "I" is much better. Don't be niggards in this; it cheers the Doctor's heart, and it will lighten yours.