finally, it provided means of descent on London and all the expanse of country watered by the Thames.

“With such a centre, already known and organised, we can easily see that each fresh wave of invasion—the Angles, the Saxons, the Danes, and the Normans—found it a desirable possession and so ensured its upholding. In the earlier centuries it was merely a vantage ground. But when the victorious Romans brought with them the heavy solid fortifications impregnable to the weapons of the time, its commanding position alone ensured its adequate building and equipment. Then it was that the fortified camp of the Caesars developed into the castle of the king. As we are as yet ignorant of the names of the first kings of Mercia, no historian has been able to guess which of them made it his ultimate defence; and I suppose we shall never know now. In process of time, as the arts of war developed, it increased in size and strength, and although recorded details are lacking, the history is written not merely in the stone of its building, but is inferred in the changes of structure. Then the sweeping changes which followed the Norman Conquest wiped out all lesser records than its own. To-day we must accept it as one of the earliest castles of the Conquest, probably not later than the time of Henry I. Roman and Norman were both wise in their retention of places of approved strength or utility. So it was that these surrounding heights, already established and to a certain extent proved, were retained. Indeed, such characteristics as already pertained to them were preserved, and to-day afford to us lessons regarding things which have themselves long since passed away.

“So much for the fortified heights; but the hollows too have their own story. But how the time passes! We must hurry home, or your uncle will wonder what has become of us.”

He started with long steps towards Lesser Hill, and Adam was soon furtively running in order to keep up with him.

CHAPTER IV—THE LADY ARABELLA MARCH

“Now, there is no hurry, but so soon as you are both ready we shall start,” Mr. Salton said when breakfast had begun. “I want to take you first to see a remarkable relic of Mercia, and then we’ll go to Liverpool through what is called ‘The Great Vale of Cheshire.’ You may be disappointed, but take care not to prepare your mind”—this to Adam—“for anything stupendous or heroic. You would not think the place a vale at all, unless you were told so beforehand, and had confidence in the veracity of the teller. We should get to the Landing Stage in time to 

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