Abstract
IN his letter1 in NATURE on Ovis astore, Prof. A. F. Barker discusses the shedding of certain fibres by domesticated sheep. As he points out, the shed fibres are usually regarded as representatives of the outer coat of wild sheep. The persistent fibres, of indeterminate growth, are looked upon as derivatives of the ancestral under-coat of wool. It is believed that the fibres of this under-coat, instead of ceasing to grow after a few weeks or months, and later being shed, have taken to maintaining their growth for a very much longer time, often probably throughout the natural lifetime of the animal.
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