The small-pox was once as fatal as the yellow fever and the plague. It has since yielded as universally to a vegetable diet and evacuations, in the hands of apothecaries, the clergy, and even of the good women, as it did in the hands of doctors of physic. They have narrow conceptions, not only of the Divine goodness, but of the gradual progress of human knowledge, who suppose that all pestilential diseases shall not, like the small-pox, sooner or later cease to be the scourge and terror of mankind. For a long while, air, water, and even the light of the sun, were dealt out by physicians to their patients with a sparing hand. They possessed, for several centuries, the same monopoly of many artificial remedies. But a new order of things is rising in medicine. Air, water, and light are taken without the advice of a physician, and bark and laudanum are now prescribed every where by nurses and mistresses of families, with safety and advantage. Human reason cannot be stationary upon these subjects. The time must and will come, when, in addition to the above remedies, the general use of calomel, jalap, and the lancet, shall be considered among the most essential articles of the knowledge and rights of man. It is no more necessary that a patient should be ignorant of the medicine he takes, to be cured by it, than that the business of government should be conducted with secrecy, in order to insure obedience to just laws. Much less is it necessary that the means of life should be prescribed in a dead language, or dictated with the solemn pomp of a necromancer. The effects of imposture, in every thing, are like the artificial health produced by the use of ardent spirits. Its vigour is temporary, and is always followed by misery and death. The belief that the yellow fever and the plague are necessarily mortal, is as much the effect of a superstitious torpor in the understanding, as the ancient belief that the epilepsy was a supernatural disease, and that it was an offence against Heaven to attempt to cure it. It is partly from the influence of this torpor in the minds of some people, that the numerous cures of the yellow fever, performed by a few simple remedies, were said to be of _other_ diseases. It is necessary, for the conviction of such persons, that patients should always _die_ of that, and other dangerous diseases, to prove that they have been affected by them. The repairs which our world is destined to undergo will be incomplete, until pestilential fevers cease to be numbered among the widest outlets of human life. There are many things which are now familiar to women and children, which were known a century ago only to a few men who lived in closets, and were distinguished by the name of philosophers. We teach a hundred things in our schools less useful, and many things more difficult, than the knowledge that would be necessary to cure a yellow fever or the plague.