Two pages from the journal Textiles, part of a series by Dr. Louis J. Matos on identifying textile fibers by microscope and simple chemical tests. This installment covers animal fibers, mainly sheep's wool: its scale structure, fiber ends, central core, how grade relates to coarseness, and the gradual transition from wool to hair. It also gives the caustic alkali solubility test and the plumbate of soda test for the sulphur in wool. Figures 21-24 show wool fibres, a follicle, wool in the grease, and cattle hairs. The pages also carry a mill order blank description and a note on the 1916 Third International Cotton Conference.