44

Note (n). Page 18. Among otliers, Jolin Hunter and Sir George Baker. Note (p). Page 19. Harveii Opera, p. 6. Harvey's Works, by Willis, p. 6. Note (?). Page 20. Harveii Opera, p. 7. Translation, by Willis, p. 7. Note (r). Page 20. In the opinion of Jenner small-pox and cow-pox •were the same disease; cow-pox "was small-pox in the cow ; vaccinia was variola, which, had been modified by the constitution of the cow. Later researches seemed to confirm this opinion, which was all the more proba- ble, in that it connected the fact of the protecting power of vaccination with the familiar fact of the protecting power of a first attack of small-pox. But the recent researches of the Lyons Committee furnish evidence which seems conclusive against this opinion. They have proved that small-pox and cow-pox, though closely allied, are yet distinct diseases. So the protective power of vaccination has become an isolated fact. Note (s). Page 21. How little exact knowledge have we of the conditions of the body which increase or lesseu the liability to