Labor does not necessarily become less as times go on“It may even happen, at the worst, that theutilization of a natural source of energy involvesmore labour than the human expenditure ofenergy one is seeking to replace. In this field it ischance which decides; for the discovery of a newand easily accessible source of energy or of aneconomic transformation process for a knownsource of energy is not one of those things one issure of reaching on a basis of thinkingmethodically and spending the necessary timethereon.