1. J.Milton Paradise Lost Book iv (1667).
2. J.Dyer The Fleece(1757).
3. Sottish Section
4. M.Hollot L'Arl de la Teinture de la Laine(Paris 1734).
5. B. S. 1006: Part 2 (obtainable from the British Standards Institution 24–28 Victoria Street London S. W. I).