voyage by sea. But the sea was very unpopular in the Middle Ages and for many very good reasons. In the first place, ships were very small. The vessels on which Magellan made his famous trip around the world, which lasted many years, were not as large as a modern ferryboat. They carried from twenty to fifty men, who lived in dingy quarters (too low to allow any of them to stand up straight) and the sailors were obliged to

eat poorly cooked food as the kitchen arrangements were very bad and no fire could be made whenever the weather was the least bit rough. The mediæval world knew how to pickle herring and how to dry fish. But there were no canned goods and fresh vegetables were never seen on the bill of fare as soon as the coast had been left behind. Water was carried in small barrels. It soon became stale and then tasted of rotten wood and iron rust and was full of slimy growing things. As the people of the Middle Ages knew nothing about microbes