otherwise, except when he wished to divert the suspicion of others.

Sir Nathaniel switched off the electric light, and when the room was
pitch dark, he came to Adam, took him by the hand, and led him to a seat
set in the southern window. Then he softly drew back a piece of the
curtain and motioned his companion to look out.

Adam did so, and immediately shrank back as though his eyes had opened on
pressing danger. His companion set his mind at rest by saying in a low
voice:

"It is all right; you may speak, but speak low. There is no danger
here--at present!"

Adam leaned forward, taking care, however, not to press his face against
the glass. What he saw would not under ordinary circumstances have
caused concern to anybody. With his special knowledge, it was
appalling--though the night was now so dark that in reality there was
little to be seen.

On the western side of the tower stood a grove of old trees, of forest
dimensions. They were not grouped closely, but stood a little apart from
each other, producing the effect of a row widely planted. Over the tops
of them was seen a green light, something like the danger signal at a
railway-crossing. It seemed at first quite still; but presently, when
Adam's eye became accustomed to it, he could see that it moved as if
trembling. This at once recalled to Adam's mind the light quivering
above the well-hole in the darkness of that inner room at Diana's Grove,
Oolanga's awful shriek, and the hideous black face, now grown grey with
terror, disappearing into the impenetrable gloom of the mysterious