To reach it from Castle Hill, the most pleasant way is by descending the street, and turning to the left past St. Giles' Church. This road will soon bring us to the river, at a lock, where we cross by an iron foot-bridge. We are now on the open Green we saw from above, which is known as "Midsummer Common," from the great fair held there at that season. As we make our way over it, we see to our left along the river bank the long white boathouses[96] of the various colleges; for it is not till below this lock that the river becomes navigable for an eight-oar, and all the University rowing is done between it and that next below, at Baitsbite, three miles and more down the stream to the northward. Baitsbite[97] is the starting-point of the annual college races, held at the conclusion of the May Term.[98] As is well known, these are decided by "bumping," the boats all starting simultaneously one behind another, with a clear interval of two lengths between each. Any boat making a bump takes the place of its defeated rival in the next race, and has the privilege of rowing back to its boat-house with its flag flying.[99] This is also done by the boat Head of the River, which, of course, cannot bump, though it may be bumped. Should a boat make its bump on each of the four evenings that the races last, the crew are said to "get their oars," each man's oar becoming his personal property and being usually hung in his rooms as a trophy, appropriately painted with the College colours. These colours are also worn for racing; the most easily recognised being the bright scarlet of Lady Margaret (St. John's), the black and white of Trinity Hall, the green of Queens', the black and yellow of Clare, and the red and black of Jesus. The flags always bear the College arms, except that "First Trinity" fly the three crowned lions of King Edward the Third. [Footnote 96: These are large wooden edifices containing sheds for the boats below and dressing-rooms for the crews above.] [Footnote 97: See Chapter XIII.] [Footnote 98: There are also races in the Lent Term for the less exalted boats. But only the first division in the May races has any general interest. Each division contains sixteen boats, and the last boat of each division is also the first of the division below, being thus known as a "sandwich boat."] [Footnote 99: The races end at Chesterton, about a mile below the boathouses.]