I am a little white powder, which you see lying upon every table. I am familiar to th

I am a little white powder, which you see lying upon every table. I am familiar to the eyes of infancy and old age. I am welcome to the one, and I am tolerated by the other. I please the emetic, and I agree with the dyspeptic. I excite the nausea of the sick, and I promote the appetite of the well. I am peace to the emetic, and I am war to the dyspeptic. I cause the former to be thankful that he is not sick, and I make the latter thankful that he is not emetic. I am a blessing to the poor, and I am an emetice to the rich. I am an aid to the surgeon, and I am a trouble to the emetic. I am a favourite with him who has