A mid-19th-century magazine article describing the assaying, or "conditioning," of silk to detect moisture and adulteration. It explains how silk absorbs moisture and is weighted with gum, sugar and fats, and how French and Italian conditioning houses test humidity, foreign matter, length, elasticity, twist and lustre. It reports on a newly opened conditioning establishment in London's Broad Street Buildings and argues that British silk manufacturers have lagged because they neglect chemistry.