witches were burned because the death of some pigs was thought to be due to witchcraft. Nowadays, probably, the cause of death would appear in the death certificate of those pigs as swine fever; and many of the so-called haunted houses, by the method of Zadig, have been proved to be haunted, not by the ghosts of the departed, but by bad drains. Children often adopt, quite unconsciously, the method of Zadig. I had a good illustration of this last Sunday, and I must tell you about it. Talking to a blind child in the children's ward, I asked her if she knew who I was. She said at once, "Yes, the doctor." I asked her how she knew that. She answered again, "Oh, nurse always says 'Hush' when the doctors come into the wards."
Xow, gentlemen, if you really enter into the true spirit of medical work, you will very soon train yourselves to be accurate observers, and from observing human beings you will soon be tempted to investigate and delight in other natural phenomena, to find out your own proper place in this great cosmic system, of which you are only a unit or microcosm. There is no doubt that a true student of Nature has provided himself with endless sources of amusement and happiness. Some of you may remember the lines of Longfellow on the fiftieth birthday of the great naturalist Agrassiz:
"And nature, the old nurse, took
The child upon her knee,
Saying, 'Here is a story-book
Thy Father has written for thee.'
"And he wandered away and away.
With Nature, the dear old nurse,
Who sang to him night and day
The rhymes of the universe.
"And whenever the way seemed long,
Or his heart began to fail,
She would sing a more wonderful song,
Or tell a more marvelous tale."
And this is the heritage of all honest students of medicine who have built up their life's work on accurate observation.
