First installment of a series by H. B. Gordon on identifying textile fibers, with emphasis on microscopic appearance and supporting chemical tests. It covers microscope equipment, illumination, mounting media, and photomicrography, then begins the classification of fibers (mineral, animal, vegetable, artificial). It treats asbestos and the silks in detail: cultivated, tussah or wild, spider, and byssus silk, plus tin and organic weighting. Illustrated with nine photomicrographs and closed with references to Chamot and Matthews.

A continuation of H. B. Gordon's series on microscopic identification of textile fibers, covering the hair fibers with a focus on sheep's wool. It discusses variation in fiber diameter in wool compared with camel hair, cashmere and llama, how to judge wool fineness under the microscope, and kemps (opaque medullated fibers). It also explains the limits of identifying re-worked wool (shoddy), illustrated with 125x micrographs of fine, medium, coarse and re-worked wool. Ends with references and a note that the series continues.

Concluding part of H. B. Gordon's series on identifying fibers by microscope, covering the minor hair fibers. It describes the microscopic appearance of mohair, camel, alpaca and llama, vicuna, cashmere, common goat, white rabbit, cow, horse and human hair, noting scale visibility, medulla and fiber fineness. Illustrated with photomicrographs (Figs. 14-25) at 100x to 125x magnification.