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DUST AND DISEASE. 327

may—if he has any thing to say of these diseases Which is
characteristic of them—he cannot evade the use of these
terms or the exact equivalents of them. While perfectly
applicable to life and to living things, these terms express
qualities which are not only inapplicable to common chemi-

cal agents, but, as far as I can see, actually inconceivable
of them.”

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