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ASBESTOSIS
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. ASBESTOSIS
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Asbestosis is a pneumoconiosis catised by the initia tion o asbestos dust. It is distinct from silicosis in its pathology and clinically. Whether asbcstosis will remain ' a distinct form of pulmonary dust disease or will prove to be of a type common to a number of dusts remains to be seen. So far, it is die only pneumoconiosis, other than silicosis, that has received any considerable amount_ 3f--Sfudy from pathologists, clinicians and industrial hygienists.
Whereas silicosis has been recognized for many cen turies. asbcstosis is a newcomer. Asbestos (Canadian) is a hydrated magnesium silicate containing no free silica but about 44 per cent of combined silica, 43 per cent magnesium, nearly 13 per cent of water, and traces of iron and nickd.- While asbestos was known to the ancients, the fabricating of asbestos on a large scale is comparatively new; it received a tremendous impetus from its use in connection with automobiles and as an insulating material and a heat resistant for a great variety of mechanical purposes.
While Hoffman * caQed attention to the possible harmfulness of asbestos dust in 1918, it was not until February 1927 that asbestosis was, so to speak, officially recognized in this country by the filing of a disability daini for workmen's compensation in Massachusetts. The claimant was a foreman in the weaving department of an asbestos plant, and the claim was upheld by the Massachusetts Industrial Accident Board. This was twenty-seven years after the first fatal case was reported id'England by Dr. Montague Murray. In 1910 and
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