Let us put it in another way. Thorney was a place of great resort, as I have shown in these pages already: every day passed into Thorney, and out of Thorney, long processions or caravans of merchants with merchandise carried by slaves--the most valuable part of their merchandise--and by packhorses and mules; they waded through the northern ford; they rested for a night in one of the inns of the place: next day they waded through the southern ford, attained the causeway, and went south. Or else it was the reverse way. The place required a daily supply of food, and, as there were many travellers, a great quantity of food. If you go down the river from Thorney, you will find that the present site of London, on the two hillocks rising out of the river, was the first and only place where men could put up huts in which to live while they caught fish and trapped wild birds for Thorney. If, therefore, the Isle of Bramble was a flourishing centre of trade long before London was a place of trade at all, then the original London must have been a settlement of fishermen and trappers who supplied the markets of Thorney. [Illustration: Fishers' Huts at the mouth of the Fleet.] In course of time--we are still in prehistoric times--the site of London was discovered by seamen and merchant adventurers exploring the rivers in their ships. It was found cheaper and easier and safer to carry goods to and from Thorney by way of sea than by land. To coast along from Dover to the strait between Rum--the Isle of Thanet, and the mainland--to pass through the strait and up the river, was found easier and cheaper than to undertake the costly and dangerous march from Dover to Thorney Ford. This way, then, was by many undertaken; and so a certain part of the trade along the old causeway was diverted. The next step was the discovery of London as a port. There was no port at Thorney: on the site of London were the two natural ports of Walbrook and the mouth of the Fleet; there was a high ground safer and more salubrious than that of Thorney; ships began to anchor there, quays were erected, goods were landed; the high road which we call Oxford Street was constructed to connect London with the highway of trade--afterwards Watling Street; and the trade of London began.