Karl, Grand Duke of Frankfurt, Royal Highness: In a Lecture at the Museum in Frankfurt

completed travels, he wandered through France and the United Netherlands, where he made the most famous men his friends, learned from them the laws and the various forms of government of these provinces, gained insight into their various institutions in literary, political, and economic fields, searched through the libraries and the manuscripts within them, observed the treasures of nature and art and examined them as a connoisseur, and even lowered himself so far that he went into the workshops of craftsmen to enrich his acquired knowledge with new expansions and to be able to apply them with benefit in the future. This ultimate purpose should be held by most travelers, especially those who one day want to become rulers of a people and vast lands, in order to learn to examine and understand for themselves how hard the craftsman, the artist, and the farmer must earn their bread to be able to pay the due tribute to their sovereign and to feed themselves and their own. The feeling of such a sublime traveler is stirred at such a sight; it touches him, and he notes it for the future when he himself becomes a ruler over lands and peoples. But this zeal, these deep insights that are required for this,