In the summer of 1762, he took leave of his friends in England to return to his native country. On his voyage he discovered in oil or grease thrown on the water, a property, which few people ever dreamt of. When we learn of _gold_ that it may by beating, be expanded into a leaf of such incredible fineness, that a guinea might in that way be made to cover Solomon's temple, or deck Noah's ark, we are filled with wonder of such a metal. Doctor Franklin tells us of equal wonders in oil. He informs us, that a wine glass full of pure oil poured on a mill pond, will presently spread over it, with a film inconceivably thinner than a cobweb, and so adhesive that the winds shall not excite it to mad-caps and breakers. Hence, he infers, that oil might be made a mean of saving ships during a violent storm at sea. In this voyage he made also another discovery, which ought to be known to all going by sea, viz. that if persons perishing of thirst on a voyage, would but bathe half a dozen times a day in the sea water, which they easily might, by using their empty water casks as bathing tubs, they would obtain great relief from their thirst, and live several days longer; thence enjoying a better chance for their lives, by getting into port, or falling in with some friendly sail. On his arrival in Philadelphia doctor Franklin was welcomed with marks of the most flattering respect by the citizens universally--handsome addresses and dinners were given him by literary societies and clubs--and the assembly, in the most public manner voted him their thanks for "the great honour and services he had rendered the country in general during his residence in England; and especially to the province of Pennsylvania." And they accompanied their thanks with a present of five thousand pounds. Ye blind parents who can think hard of laying out a few dollars for books and education of your children, O think of this, and learn a course of conduct more to your own credit and to their temporal and eternal welfare. In a few weeks after his return to Philadelphia there occurred in that neighbourhood an affair that serves to show the popularity of doctor Franklin in a very strong light.