common travelling trunk. Plattner, being bored with his passive superintendence, seems to have welcomed the intervention of Whibble with his green powder as an agreeable diversion, and, unlocking this cupboard, proceeded at once with his analytical experiments. Whibble sat, luckily for himself, at a safe distance, regarding him. The four malefactors, feigning a profound absorption in their work, watched him furtively with the keenest interest. For even within the limits of the Three Gases, Plattner's practical chemistry was, I understand, temerarious.
They are practically unanimous in their account of Plattner's proceedings. He poured a little of the green powder into a test-tube, and tried the substance with water, hydrochloric acid, nitric acid, and sulphuric acid in succession. Getting no result, he emptied out a little heap—nearly half the bottleful, in fact—upon a slate and tried a match. He held the medicine bottle in his left hand. The stuff began to smoke and melt, and then exploded with deafening violence and a blinding flash.
The five boys, seeing the flash and being prepared for catastrophes, ducked below their desks, and were none of them seriously hurt. The window was blown out into the playground, and the blackboard on its easel was upset. The slate was smashed to atoms. Some plaster fell from the ceiling. No other damage was done to the school edifice or appliances, and the boys at first, seeing nothing of Plattner, fancied he was knocked down and lying out of their sight below the desks. They jumped out of their places to go to his assistance, and were amazed to find the space empty. Being still confused by the sudden violence of the report, they hurried to the open door, under the impression that he must have been hurt, and have rushed