The opposite page was blank. Captain Parkinson turned half a dozen leaves.
"German!" he cried, in a note of disappointment, "Can you read German script?"
"After a fashion," replied the other. "Let's see. Es wonnte sechs—und— dreissig unterjacke," he read. "Why, blast it, was the man running a haberdashery? What have three dozen undershirts to do with this?"
"A memorandum for outfitting, probably," suggested the captain. "Try here."
"Chemical formulæ," said Trendon. "Pages of 'em. The devil! Can't make a thing of it."
"Well, here's something in English."
"Good," said the other. "By combining the hyper-sulphate of iridium with the fumes arising from oxide of copper heated to 1000 C. and combining with picric acid in the proportions described in formula x 18, a reaction, the nature of which I have not fully determined, follows. This must be performed with extreme care owing to the unstable nature of the benzene compounds."
"Picric acid? Benzene compounds? Those are high explosives," said Captain Parkinson. "We should have Barnett go over this."
"Here's a name under the formula. Dr. A. Mardenter, Ann Arbor, Mich. That explains its being in English. Probably copied from a letter."
"This must have been one of the experiments in the valley that Slade told us of," said the captain, thoughtfully. "Why, see here," he cried, with something like exultation. "That's what Dr. Schermerhorn was doing here. He has the clue to some ex-
