Suppose I call on a friend who is ill, and he says that on the shelf I shall find seven bottles, numbered in order from one to seven, and asks me to give him half a drachm of quinine from the seventh bottle. We must remember that it is the seventh bottle, and in order to make the matter sure, my friend says, 'Go to the seventh bottle,'—the last one—the one numbered seven on it. I go to the shelf, and pick up the first bottle, from which I give him half a drachm of quinine, and the result is he dies.
One half a dozen kinds of quinine from six feverous
