miners at middle age of slow consumption, that they age prematurely and become unfit for work between the thirty-fifth and forty-fifth years, that many are attacked by acute inflammations of the respiratory organs when exposed to the sudden change from the warm air of the shaft (after climbing the ladder in profuse perspiration), to the cold wind above ground, and that these acute inflammations are very frequently fatal. Work above ground, breaking and sorting the ore, is done by girls and children, and is described as very wholesome, being done in the open air.
In the North of England, on the borders of Northumberland and Durham, are the extensive lead mines of Alston Moor. The reports from this district agree almost wholly with those from Cornwall. Here, too, there are complaints of want of oxygen, excessive dust, powder smoke, carbonic acid gas, and sulphur, in the atmosphere of the workings. In consequence, the miners here, as in Cornwall, are small of stature, and nearly all suffer from the thirtieth year throughout life from chest affections, which end, especially when this work is persisted in, as is almost always the case, in consumption, so greatly shortening the average of life of these people. If the miners of this district are somewhat longer lived than those of Cornwall, this is the case, because they do not enter the mines before reaching the nineteenth year, while in Cornwall, as we have seen, this work is begun in the twelfth year. Nevertheless, the majority die here, too, between forty and fifty years of age, according to medical testimony. Of 79 miners, whose death was entered upon the public register of the district, and who attained an average of 45 years, 37 had died of consumption and 6 of asthma. In the surrounding districts, Allendale, Stanhope, and Middleton, the average length of life was 49, 48, and 47 years respectively, and the deaths from chest affections composed 48, 54, and 56 percent of the whole number. Let us compare these figures with the so-called Swedish tables, detailed tables of mortality embracing all the inhabitants of Sweden, and recognised in England as the most correct standard hitherto attainable for the average