of the subject; and that the supposition which has sometimes been advanced that Doctor Morton was necessarily indebted to Doctor Jackson for a knowledge of the hypnotic effect of ether is wholly gratuitous.
We will now quote directly from Doctor Warren's lecture on The Influence of Anaesthesia on the Surgery of the Nineteenth Century, delivered before the American Surgical Association in 1897:
Morton having acquainted himself by conversation with Mr. Metcalf and Mr. Burnett, both leawhat I had done, and asked him to give me a certificate that ether was harmless in its effects.
This he positively refused to do. I then told him I should go to the principal surgeons and have the question thoroughly tried.
I then called on Doctor Warren, who promised me an early opportunity to try the experiment, and soon after I received the invitation ..
Now as these are both ex parte statements, and as there are no witnesses on either side, according to the rule we have already establi