"There is not much to tell, sir," answered Crochard. "I learned of the existence of this hut yesterday evening. Some children, searching for mushrooms for a friend of mine, who is a restaurateur, happened to see the wires among the trees, and told him of their discovery. He thought it so curious that he at once sent word to me."

"And you, of course, sent word back that he was to tell no one else," said Delcassé, with a smile.

"Yes, I thought that best. I paid a visit to the hut as soon as it was light this morning, entered it, examined it, and convinced myself that it was really a wireless station. Then I made certain inquiries. The grove, it appears, is owned by a gentleman of Marseilles, and was once much larger than it is now. The hut was built for the use of charcoal-burners, but has not been occupied for more than two years. I would suggest that the police ascertain whether the owner was aware he had a tenant."

"We will do so," said Delcassé. "But who was this tenant?"

"There is some doubt on that point," answered Crochard slowly. "That little road is used but seldom, for a better one now leads around the base of the hill; and few people ever have occasion to enter the grove. It was, of course, for this very reason that the hut was chosen for this installation. I have found no one who saw any man at work there. On the other hand, a friend of mine, who has a cabaret on the main road just outside the city gate, has seen pass a number of times within the past week a man who, from his face and dress, was evidently not a Frenchman, and whose actions appeared to my friend to be suspicious."

Delcassé smiled.

"You seem to have many friends," he remarked; "and unusually observant ones."

"Yes," agreed Crochard; "I am fortunate in my friends; and they find it greatly to their interest to keep their eyes open."

"Did you secure a description of this stranger?"

"Yes; but there should have been much more than a mere description. Some of my friends are more intelligent than others. Still, it may be of service. This stranger was a small man, slightly built, with grey hair and bright, dark eyes. His complexion was also rather dark, and my friend hazarded the guess that he was a Spaniard. He was dressed in dark clothes, cut after a fashion not French, and wore a soft, dark hat."