First part of Thomas Henry's memoir, reprinted from the Manchester Literary and Philosophical Society, on the nature of wool, silk, and cotton as materials for dyeing. It opens with a short history of dyeing (Egyptians, Phoenician and Tyrian purple, early English dyeing and a 1596 dyeing tract). It then reviews theories of why fibres take dye differently, namely pore structure versus chemical attraction, and reports Neumann's and Berthollet's chemical analyses of wool, silk, and cotton. It ends at the start of the discussion of scouring wool, and is to be continued.