He closed the door carefully behind him.
"I want you all," he begged, "to listen very carefully to me.

You will discover the application of what I am going to read, when I am finished.
Now, if you please." They looked at him wonderingly.

It was evident that the Professor was very much in earnest.

He held the book a little way away from him and read slowly and distinctly.
"This," he began, "is the diary of a tour made by Craig and myself in Northern Egypt some fourteen years ago.

Here is the first entry of import:-- "_Monday_.