ill be found a fascinating puzzle. Half the
lines are, of course, on the sides, and the others radiate from the
centre.

36.--_The Donjon Keep Window._

On one occasion Sir Hugh greatly perplexed his chief builder. He took
this worthy man to the walls of the donjon keep and pointed to a window
there.

"Methinks," said he, "yon window is square, and measures, on the inside,
one foot every way, and is divided by the narrow bars into four lights,
measuring half a foot on every side."

"Of a truth that is so, Sir Hugh."

[Illustration]

"Then I desire that another window be made higher up whose four sides
shall also be each one foot, but it shall be divided by bars into eight
lights, whose sides shall be all equal."

"Truly, Sir Hugh," said the bewildered chief builder, "I know not how it
may be done."

"By my halidame!" exclaimed De Fortibus in pretended rage, "let it be
done forthwith. I trow thou art but a sorry craftsman if thou canst not,
forsooth, set such a window in a keep wall."

It will be noticed that Sir Hugh ignores the thickness of the bars.

37.--_The Crescent and the Cross._

When Sir Hugh's kinsman, Sir John de Collingham, came back from the Holy
Land, he brought with him a flag bearing the sign of a crescent, as shown
in the illustration. It was noticed that De Fortibus spent much time in
examining this crescent and comparing it with the cross borne by the
Crusaders on their own banners. One day, in the presence of a goodly
company, he made the following striking announcement:--

"I have thought much of late, friends and masters, of the conversion of
the crescent to the cross, and this has led me to the finding of matters
at which I marvel greatly, for that which I shall now make known is
mystical and deep. Truly it was shown to me in a dream that this crescent
of the enemy may be exactly converted into the cross of our own banner.
Herein is a sign that bodes good for our wars in the Holy Land."

[Illustration]

Sir Hugh de Fortibus then explained that the crescent in one banner might
be cut into pieces that would exactly form the perfect cross in the
other. It is certainly rather curious; and I show how the conversion from
crescent to cross may be made in ten pieces, using every part of the
crescent. The flag was alike on both sides, so pieces may be turned over
where required.

38.--_The Amulet._

A strange man was one day found loitering in the courtyard of the cas