After re-uniting M. LeBrun with his shoes I returned to my position on the deck of the chaland, this time carrying a watch that had been given to me by Monsieur Huygens. First I timed one hundred rockings of the chaland I was on, and then I began to make the same observation of other chalands on the river. Most of them rocked at approximately the same frequency as the one of M. LeBrun. But I noticed one or two that rocked very slowly. Naturally I then began to scrutinize these chalands more carefully, whensoever they came into view, and familiarized myself with their general appearance and their crews. Somewhat to my disappointment, the first one turned out to be laden with quarried stones. Of course, no effort had been made to conceal the nature of its cargo. But later I saw one that had been filled up with barrels.