"'Well,' I answered sulkily, 'I have been feeling so healthy for the last two years that I thought I could indulge myself a little. You are aware how I abominate tobacco.'
"'Quite so,' he said, 'and now you see the result of this miserable self-indulgence. Two years ago I prescribed tobacco for you, to be taken three times a day, and you yourself admit that it made a new man of you. Instead of feeling thankful you complain of the brief unpleasantness that accompanies its consumption, and now, in the teeth of my instructions, you give it up. I must say the ways of patients are a constant marvel to me.'
"'But how,' I asked, 'do you know that my reverting to the pleasant habit of not smoking is the cause of my present ailment?'
"'Oh!' he said, 'you are not sure of that yourself, are you?'
"'I thought,' I replied, 'there might be a doubt about it; though of course I have not forgotten what you told me two years ago.'
"'It matters very little,' he said, 'whether you remember what I tell you if you do not follow my orders. But as for knowing that indulgence in not smoking is what has brought you to this state, how long is it since you noticed these symptoms?'
"'I can hardly say,' I answered. 'Still, I should be able to think back. I had my first sore throat
