The deaths from consumption in the United States, in the year 1880, numbered 91,551, almost one-eighth the entire mortality from all causes. This pregnant fact seems to furnish at once an incentive and excuse for the following endeavor to ascertain what definite relation there is, if any such exists, between this disease and certain climatic conditions in the United States.
An obstacle is encountered at the very threshold of the inquiry in our defective system of registration. It must be admitted, in the first place, that many cases reported as consumption have no relation to that disease. It is also well known that many cases are not reported at all. The migratory character of a considerable body of the population—especially its westward flow—is also a disturbing element in a statistical study. And, finally, those regions, the climates of which have secured the reputation of being curative of consumption, have