Often young De Plonville's idiotic impetuosity gave color to these suspicions. For instance, there is the well-known Toulon incident. In a heated controversy young De Plonville had claimed that the firing of the French ironclads was something execrable, and that the whole fleet could not hold their own at the cannon with any ten of the British navy. Some time after, the naval officers learned that the Government at Paris was very much displeased with the inaccurate gun practice of the fleet, and the hope was expressed that the commander would see his way to improving it. Of course, the officers could do nothing but gnash their teeth, try to shoot better, and hope for a time to come when the Government then in power would be out, and they could find some tangible pretence for hanging young De Plonville from the yard-arm. All this has only a remote bearing upon this story, but we now come to a matter on which the story sinks or swims. De Plonville had a secret-- not such a secret as is common in Parisian life, but one entirely creditable to him. It related to an invention intended to increase the efficiency of the French army. The army being a branch of the defences of his country with which De Plonville had nothing whatever to do, his attention naturally turned towards it. He spoke of this invention, once, to a friend, a lieutenant in the army. He expected to get some practical suggestions. He never mentioned it again to anyone. "It is based on the principle of the umbrella," he said to his friend; "in fact, it was the umbrella that suggested it to me. If it could be made very light so as not to add seriously to the impedimenta at present carried by the soldier, it seems to me it would be exceedingly useful. Instead of being circular as an umbrella is, it must be oblong with sharp ends. It would have to be arranged so as to be opened and closed quickly, with the cloth thin, but impervious to water. When the army reached a river each soldier could open this, place it in the water, enter it with some care, and then paddle himself across with the butt-end of his gun, or even with a light paddle, if the carrying of it added but little to the weight, thus saving the building of temporary bridges. It seems to me such an invention ought to be of vast use in a forced march. Then at night it might be used as a sort of tent, or in a heavy rain it would form a temporary shelter. What do you think of the idea?" His friend had listened with half-closed eyes. He blew a whiff of cigarette smoke from his nostrils and answered: "It is wonderful, De Plonville," he said drawlingly. "Its possibilities are vast--more so than even you appear to think. It would be very useful in our Alpine corps as well." "I am glad you think so. But why there?"