“And your package,” he said to the Prince, “I shall send about the same time. I have been very busy, and can trust no one to unpack this box but myself.” “You need not trouble to send it, and in any case I don’t wish to run the risk of having it delivered at a wrong address by your messenger. I cannot afford to wait so long as would be necessary to duplicate the order. I am dining with the Professor to-night, so will drive this way, and take the parcel myself.” “Perhaps,” said the chemist, “it would be more convenient if I sent your parcel to Professor Potkin’s house?” “No,” said the Prince decisively, “I shall call for it about five o’clock.” The Professor laughed. “We experimenters,” he said, “never trust each other,” so they shook hands and parted. On returning to his workshop, Lermontoff bounded up the stairs, and hailed his friend the Lieutenant. “I say, Drummond, I’m going to dine to-night with Professor Potkin of the University, my old teacher in chemistry. His hour is half-past five, and I’ve got an invitation for you. There will be several scientists present, and no women. Will you come?” “I’d a good deal rather not,” said the Englishman, “I’m wiring into these books, and studying strategy; making plans for an attack upon Kronstadt.” “Well, you take my advice, Alan, and don’t leave any of those plans round where the St. Petersburg police will find them. Such a line of study is carried on much safer in London than here. You’d be very welcome, Drummond, and the old boy would be glad to see you. You don’t need to bother about evening togs--plain living and high thinking, you know. I’m merely going to put on a clean collar and a new tie, as sufficient for the occasion.” “I’d rather not go, Jack, if you don’t mind. If I’m there you’ll all be trying to talk English or French, and so I’d feel myself rather a damper on the company. Besides, I don’t know anything about science, and I’m trying to learn something about strategy. What time do you expect to be back?” “Rather early; ten or half-past.” “Good, I’ll wait up for you.” At five o’clock Jack was at the chemist’s and received his package. On opening it he found the ozak in two four-ounce, glass-stoppered bottles, and these he put in his pocket. “Will you give me three spray syringes, as large a size as you have, rubber, glass, and metal. I’m not sure but this stuff will attack one or other of them, and I don’t want to spend the rest of my life running down to your shop.” Getting the syringes, he jumped into his cab, and was driven to the Professor’s. “You may call for me at ten,” he said to the cabman. There were three others besides the Professor and himself, and they were all interested in learning the latest scientific news from New York and London.