Abstract
An investigation, including optical and electron microscope studies, of the sequence of attack of various reagents on wool has revealed significant variations in the stability of the histological components of the fibre. In particular, further information has been obtained about the resistant membranes, together with additional evidence of a tubular resistant membrane lying immediately beneath the cuticular layer, and completely surrounding the cortex. This membrane is identified with the subcuticular membrane of Alexander and Earland1. The lability of the orthoeortex, and the greater stability of the paracortex, towards hydrolytic reagents, have also been confirmed. Observations on the action of oxidising agents, such as N‐chlorourea and acid potassium permanganate, are also included. Details are given of a new rapid technique for obtaining fibre replicas for electron‐microscopic examination.
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