It was largely believed at that time, by myself and many others, that science, like wealth,--especially medical science,--was aristocratical; that the learned world, though they saw the republican tendencies of things, were predisposed to throw dust in the people's eyes as long as they could. The fact that almost all our medicines, whether in the condition in which we see them labelled at the apothecary's shop, or as prescribed by the family physician, have Latin names,--was often quoted in proof of this aristocratic feeling and tendency. Now there was doubtless some foundation for this opinion. Medical men did then and still very generally do believe, that it is better, on the whole, for the mass of mankind to have nothing to do with these matters, except at the prescription of those who have given the best part of their lives to the study of medicine and disease. That they are weapons of so much power, that even physicians--men who only partially understand the human constitution and their influence on it--are almost as likely to do harm with them as good, and that it is quite enough for society to bear the evils which are connected with the regular study and practice of the profession, without enduring a much larger host, inflicted by those who have other professions and employments, and must consequently be still more ignorant than their physicians. And may not this be one reason why a foreign language has been so long retained in connection with the names of diseases and medicines? But though physicians entertain the belief alluded to, and though it were founded in truth, it does not thence follow that mankind are to remain in ignorance of the whole subject of life and health, nor is it the intention of enlightened medical men that they shall. The latter are much more ready, as a general rule, to encourage among mankind the study of the most appropriate means of preventing disease, than they are willing to take the needful pains. In short, though physicians by their slowness to act, in this particular, are greatly faulty, the world as a mass are still more so. I was speaking, at first, of tic douloureux. This is a painful affection of a nerve or a cluster of nerves. When it first began to be spoken of, it was confined chiefly to an expansion of nerve at the side of the face, called in anatomical works _pes anserina_. But, of late years, it has been found to attack various nerves and clusters of nerves in different parts of the body. In truth, under the general name of neuralgia, which means about the same thing, we now have tic douloureux of almost every part of the human system, and it has become so common that instead of one in a million, we have probably one or two if not more in every hundred, who have suffered from it in their own persons.