A 1907 journal article arguing that textile mills in the United States need artificial control of air temperature and humidity. It sets out the costs of dry, hot mill air (waste, machine stoppages, power use, poorer yarn and cloth quality, worker efficiency) and compares plenum, exhaust, and combined supply-and-exhaust ventilation. It concludes that a combination system best maintains uniform conditions. The text is a continuation, ends with "To be continued," and promises a later engineering discussion of humidifying devices.