This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ... occupations, and organic dust, such as, "epithelial scales, seed, spores, bacteria, pollen, plant cells, fluff of various kinds, bites of insects, starch, pus-cells, algae, rotifers, fragments of hair, feathers, and bits of tissue, fibers of cotton, etc."1 The dust of great danger from a health viewpoint is mineral ...

Personal Hygiene Applied 2016, Palala Press

ISBN-13: 9781357955304

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