"[H]e illustrates this position by stating the following general principles. The phenomena afforded by trade, are (most of them) a part of the history of Nature, and therefore may both challenge the naturalist's curiosity and add to his knowledge. Nor will it, he adds, justify learned men in the neglect and contempt of this part of natural history, that the men from whom it must be learned are illiterate mechanics, and the things which are exhibited are works of Art and not of Nature."