The artificial isles that supported the Bridge were called Starlings; the chutes between the Starlings, through which the divided River coursed, were denominated Locks. Daniel, unable to see much but heads and shoulders, estimated, by a kind of dead reckoning, that he must be passing over Long Entry Lock, which was the narrowest, hence most dangerous of them all, as the Chapel Pier to its north side had grown so fat over the centuries as to nearly pinch it shut. Then, looking up, he saw a stone vault overhead, and knew he was passing under the Chapel. Next (counting the Locks and Starlings in his head, like a Papist going through the Rosary) would be Chapel Lock—also quite narrow—but then St. Mary’s Lock, one of the widest on the whole bridge, hence, popular among watermen. Directly over St. Mary’s was the open fire-break called The Square. And it was there, Daniel reasoned, that hackney-drivers and sedan-porters would flock in hopes of swopping passengers with the watermen below.