t, at any rate to you, in your mind."

"Quite true."

"Can you give it us?"

"Jove! let's have it!" exclaimed young England.

"Certainly, if you like," I said. "I don't know whether you ever heard
of the Marnier affair?"

Young England shook his head, but the doctor replied at once.

"Three years ago, wasn't it?"

"Four."

"And it happened in some remote place in the Sahara Desert?"

"In Beni-Kouidar. I was with Henry Marnier in Beni-Kouidar at the time."

"Go ahead!" said young England more eagerly.

"Poor Marnier was not an old friend of mine, but an acquaintance whom I
had met casually at Beni-Mora, which is known as a health resort."

"I send patients there sometimes," said the doctor.

"The railway stops at Beni-Mora. To reach Beni-Kouidar one must go on
horse or camel back over between three and four hundred kilometres of
desert, sleeping on the way at Travellers' Houses--Bordjs as they are
called there. Beni-Kouidar lies in the midst of immeasurable sands,
and the air that blows through its palm gardens, and round its mosque
towers, and down its alleys under the arcades, is startling: dry as the
finest champagne, almost fiercely pure and fresh, exhilarating--well,
too exhilarating for certain people."

The doctor nodded.

"Champagne goes very quickly to some heads," he interjected.

"Beni-Kouidar has nothing to say to modern civilisation. It is a wild
and turbulent city, divided into quarters--the Arab quarter, the Jews'
quarter, the freed negroes' quarter, and so on--and furthermore, is
infested at certain seasons by the Sahara nomads, who camp in filthy
tents on the huge sand dunes round about, and sell rugs, burnouses, and
Touareg work to the inhabitants, buying in return the dates for which
the palms of Beni-Kouidar are celebrated.

"I wanted to see a real Sahara city to which the Cook's tourist had not
as yet penetrated, and I resolved to ride there from Beni-Mora. When
Henry Marnier heard of it he asked if he might accompany me.

"Marnier was a young man who had recently left Oxford, and who had come
out to Beni-Mora only a week before to see his mother, who was
going through the sulphur cure. He was what is generally called a
'serious-minded young man'; intellectual, inclined to grave reading and
high thinking, totally devoid of frivolity, a little cold in manner and
temperament, one would have sworn; in fact, a type of a very well-known
kind of Oxford undergraduate, the kind that tak