Installment of a serial article on fabric analysis from Posselt's Textile Journal, July 1916, describing chemical tests for textile fibres. It covers finding the percentages of silk, cotton and wool in a mixed fabric, detecting and calculating the weighting of white, colored and black silk (with a table of per cent weighting against ounces), and the scroop of silk. It also gives chemical tests for telling cotton, linen, jute, hemp and ramie apart. A short item on mule-spun versus ring-spun cotton yarn follows.