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258 while in the carding and spinning departments the fine dust produces lung-disease in the majority of cases, and the woman who starts carding at seventeen or eighteen begins to break up and go to pieces at thirty. The chemical laborers, picked from the strongest and most splendidly built men to be found, live, on an average, less than forty-eight years.

Says Dr. Arlidge, of the potter's trade: "Potter's dust does not kill suddenly, but settles, year after year, a little more firmly into the lungs, until at length a case of plaster is formed. Breathing becomes more and more difficult and depressed, and finally ceases."

Steel dust, stone dust, clay dust, alkali dust, fluff dust, fibre dust—all these things kill, and they are more deadly than machine-guns and pom-poms. Worst of all is the lead dust in the white lead trades. Here is a description of the typical dissolution of a young, healthy, well-developed girl who goes to work in a white lead factory:

Here, after a varying degree of exposure, she becomes anæmic. It may be that her gums show a very faint blue line, or perchance her teeth and gums are perfectly sound, and no blue line is discernible. Coincidently with the anæmia she has been getting thinner, but so gradually as scarcely to impress itself upon her or her friends. Sickness, however, ensues, and headaches, growing in intensity,