It was a queerly built house: he had never realized its remarkable character until he had examined it at these close quarters. The walls were of immense thickness: that fact was brought home to him when he had opened the window of the maid’s room to see if Digby was in sight. The stairs were of concrete, the shutters which covered the windows of Oberzohn’s study were steel-faced. He decided, pending the arrival of the police, to make an examination of the two locked rooms. The first of these he had no difficulty in opening. It was a large room on the actual ground level, and was reached by going down six steps. A rough bench ran round three sides of this bare apartment, except where its continuity broke to allow entrance to a further room. The door was of steel and was fastened. The room was dusty but not untidy. Everything was in order. The various apparatus was separated by a clear space. In one corner he saw a gas engine and dynamo covered with dust. There was nothing to be gained here. The machine which interested him most was one he knew all about, only he had not guessed the graphite moulds. The contents of a small blue bottle, tightly corked, and seemingly filled with discoloured swabs of cotton-wool, however, revived his interest. With a glance round the laboratory, he went out and tried the second of the locked doors. This room, however, was well protected, both in the matter of stoutness of door and complication of locks. Leon tried all his keys, and then used his final argument. This he carried in a small leather pouch in his hip pocket; three steel pieces that screwed together and ended in a bright claw. Hammering the end of the jemmy with his fist, he forced the claw between door and lintel, and in less than a minute the lock had broken, and he was in the presence of the strangest company that had ever been housed. Four electric radiators were burning. The room was hot and heavy, and the taint of it caught his throat, as it had caught the throat of the Danish servant. He put on all the lights—and they were many—and then began his tour. There were two lines of shelves, wide apart, and each supporting a number of boxes, some of which were wrapped in baize, some of which, however, were open to view. All had glass fronts, all had steel tops with tiny air-holes, and in each there coiled, in its bed of wool or straw, according to its requirements, one or two snakes. There were cobras, puff-adders, two rattlesnakes, seemingly dead, but, as he guessed, asleep; there was a South American _fer-de-lance_, that most unpleasant representative of his species; there were little coral snakes, and, in one long box, a whole nest of queer little things that looked like tiny yellow lobsters, but which he knew as scorpions. He was lifting a baize cover when: “Don’t move, my friend! I think I can promise you more intimate knowledge of our little family.”