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238 mounds around the castle, was covered with woods, close-growing masses of pine which made a dusk even in the noonday.

I took my way up the back of the hill and stole through the wood, carefully keeping a watchful look out all round me, for I feared the presence of either of the sets of spies. At the very top I came upon a good sized circle of masonry, low but heavily built of massive stones completely covered with rich green lichen. The circle was some fifteen feet diameter, and the top was slightly arched as though forming a roof. Leaning over it I could hear a faint trickle of water; this was evidently the source of the castle supply.

I walked round it, examining it carefully; anything which had any direct communication with the castle was at present of possibly the supremest importance. There was no flaw or opening anywhere; and from the unbroken covering of the stones by the lichen, it was apparent that there had been no disturbance for years.

I sat down on the edge of the stonework and for a long time thought over matters of probability. If underneath me, as was almost to be taken for granted, lay the reservoir of the castle, it must have been made coevally with Crom itself, or even with the older castle on whose ruins it was built. It must be fed by springs in the rock which formed the base of the hill and cropped out all over it; and if it was not approachable from without, there must be some way of reaching the water from within. It might be that the chamber which contained the reservoir had some other entrance from the hill top, or from some lower level. Accordingly I made as I conceived a bee line for the castle, till I came to the very base of the hill, for I knew that in matters of water conduit the direct way is always chosen where work has to be done. As I went, I conned the ground carefully; not merely the