Ripley and Dana's "carelessness" is pardonable as they wrote before "factors of production" came to be treated as a strict concept. It would be interesting to check Ripley's Cyclopedia of 1862 which unfortunately is not available online. (The American Cyclopaedia of 1873-76 is.) Ripley's "articles and reviews were widely syndicated. He was an arbiter of taste and culture for much of the reading public" ("George Ripley" in Encyclopaedia Britannica). Yuri Tulupenko