One was Sir Samuel Bliss, for he had not yet performed those party services which led to his being known to us all as Lord Normantowers. He was a small, alert man like a ferret, with bristles of grey beard and hair, and active or even agitated movements. The second was his manager, Mr. Low, a stout, dark man with a thick nose and thick rings, who eyed strangers with a curious heavy suspicion like a congested sense of injury. It is believed that he expected to be persecuted. The third man was something of a surprise, for he was no other than his old friend Dr. Horace Hunter, as healthy and hearty as ever, but even better dressed; as he now had a great official appointment as some kind of medical inspector of the sanitary conditions of the district. But the fourth man was the greatest surprise of all. For it appeared that their conference was honoured by so great a figure in the scientific world as Professor Hake himself, who had revolutionized the modern mind with his new discoveries about the complexion in relation to health. When Hood realized who he was, a light of somewhat sinister understanding dawned on his long face. On this occasion the Professor advanced an even more interesting theory. He was a big, blond man with blinking eyes and a bull neck; and doubtless there was more in him than met the eye, as is the way with great men. He spoke last, and his theory was expounded with a certain air of finality. The manager had already stated that it was quite impossible for large quantities of petrol to have escaped, as only a given amount was used in the factory. Sir Samuel had explained, in what seemed an irascible and even irrelevant manner, that he had presented several parks to the public, and had the dormitories of his work-people decorated in the simplest and best taste, and nobody could accuse him of vandalism or not caring for beauty and all that. Then it was that Professor Hake explained the theory of the Protective Screen. Even if it were possible, he said, for some thin film of petrol to appear on the water, as it would not mix with the water the latter would actually be kept in a clearer condition. It would act, as it were, as a Cap; as does the gelatinous Cap upon certain preserved foods. “That is a very interesting view,” observed Hood; “I suppose you will write another book about that?” “I think we are all the more privileged,” remarked Bliss, “in hearing of the discovery in this personal fashion, before our expert has laid it before the public.” “Yes,” said Hood, “your expert is very expert, isn’t he--in writing books?” Sir Samuel Bliss stiffened in all his bristles. “I trust,” he said, “you are not implying any doubt that our expert is an expert.” “I have no doubt of your expert,” answered Hood gravely, “I do not doubt either that he is expert or that he is yours.” “Really, gentlemen,” cried Bliss in a sort of radiance of protest, “I think such an insinuation about a man in Professor Hake’s position----”