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 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