shall we, Miss McLeod?"

"Yes," said Myra, "and Mr. McKenzie must come and have a meal and a
rest, as I'm sure he needs both after his journey. I'll send Angus to
look after the boatman." So the three strolled up to the lodge.

"By the way," said Dennis, "of course it's all right, and you've
carried out your instructions to the letter, but how can you be sure
this is Miss McLeod, and how do you know I'm not Hilderman?"

"Mr. Garnesk described everybody I should be likely to meet," McKenzie
replied, "including Mr. Hilderman and Mr. Fuller. I know you are Mr.
Ewart's friend because you have a small white scar above your left
eyebrow. So, being with you, and wearing a shade and an Indian bangle,
I thought I was safe in concluding the lady was Miss McLeod."

"Garnesk doesn't seem to miss much!" Dennis laughed.

"He made me repeat his descriptions about twenty times," said
McKenzie, "so I felt pretty sure of myself."

When they got up to the lodge, and the messenger's requirements had
been administered to, Dennis unpacked the parcel. The spectacles
proved to be something like motor goggles; they fitted closely over
the nose and forehead, and entirely excluded all light except that
which could be seen through the glass. The only curious thing about
them was the glass itself. Instead of being white, or even blue, it
was red, and the surface was scratched diagonally in minute parallel
lines. Myra and Dennis hurried upstairs, and lighted the lamp in the
dark-room. When the girl came down again she declared that she could
see beautifully. Everything was red, of course, but she could see
quite distinctly.

"Have you any idea why these glasses are ruled in lines like this?"
Dennis asked McKenzie.

"I couldn't say for certain, sir," the youth replied. "But I should
think it was because Mr. Garnesk thought the glasses would be so near
the eye as to be ineffective. In photography, for instance, you can't
print either bromide or printing-out paper in a red light. But if you
coat a red glass with emulsion, and make an exposure on it, you can
print the negative in the usual way. I don't know why it is."

"Perhaps there is no space for a ray to form," Myra suggested.

"You must tell Mr. Garnesk how deeply grateful we all are to him,"
said Dennis. "I'll give you a letter to take back to him. It has been
a wonderfully quick bit of work!"

"I should think he has got some hundreds of the glasses finished by
this time," said McKe