A one-page installment of E. A. Posselt's "Fabric Analysis" series on conditioning textile samples for testing. It explains how to determine moisture, yolk, dirt, gum and oil in unscoured material, and how silk is conditioned and boiled off to find its gum (sericin) content. It also discusses how atmospheric moisture affects yarn count and the strength of wool, cotton and linen cloths, with results from Manchester Testing House experiments.