In order to be usable in a textile fabric, a fiber must possess spare length to be plain-woven and a physical structure which can permit of many fibers being spun along, thereby yielding a continuous thread of considerable strength and pliability. Although there area unit many fibers, such as spun glass, asbestos, various grasses, etc., which area unit used for the manufacture of textiles in peculiar and rare instances, yet the fibers that area unit utilized to the very good extent and which focus the most satisfactory qualities area unit wool, silk, cotton, and linen. All of these possess an unionized structure, and are the merchandise of a natural growth in life processes.