Dean’s Analytical Chemistry Handbook 2nd Edition by Pradyot Patnaik 2

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... depends the distinction of the value of many classes of wool and fur These scales vary both as to nature and arrangement in the case of the hairs of different animals, so that by the aid of the microscope ... under the microscope, and now we see the reason of the saw-like edge in the longitudinal section, for just as the tiles lie on the roof of a house, or the scales on the back of a fish, so the whole ... have often a means of determining from what kind of animal the hair has been derived It is on the nature of this outside scaly covering of the shaft, and in the manner of attachment of these...