Scientists nowadays set up Energy as the ancestor of everything, measure the value of its descendants by the quantity they possess of the family trait, and spend their time in showing how to utilize it for the good of mankind in general. Professor Yarren was an apostle of Energy: it absorbed him, filled him. From the weight of the sun to boiled potatoes, from the spring of a tiger to the jump of a flea, from the might of chemical disembodiment to opening an oyster, he calculated, advised, and dilated upon it. He himself, was the epitome of Energy: in his size he economized space, in his diet he ate for power, not quantity. To him eating and sleeping were Energy's warehousemen; idleness was dry-rot, moth, and mildew; laughing, talking, whistling, singing, somersets, and fishing, never-to-be-neglected and in-constant-use safety-valves. He regarded himself as an assimilator of everything that went into him, be it food, sight, sound, or scent, and his perfection as such in exact ratio to the product he derived from them. So when next morning he said "Come on" to the Doctor, and Colonel Bangem, Mrs. Colonel Bangem, Bess Bangem, and Martha, the mountain-maid, who were all standing in front of the camp rigged for a day's fishing, he meant that one of Energy's safety-valves was ready to blow off, and that further delay might be dangerous to him. In the Doctor, Energy was stored in bond as it were, subject to duties, and only to be issued on certificate that it was wanted for use and everything ready for it: therefore at the Professor's "Come on" he calmly sat down on a log, filled his pipe, leisurely lighted it, and good-humoredly remarked, "I am confident that one-half of what we call life is spent in undoing what we have done, in lamenting the lack of what we have forgotten, or going back after it: therefore I make it a rule when everything seems ready for a start--especially when going fishing--to sit five minutes in calm communion with my pipe, thinking matters over. It insures against much discomfort from treacherous memories and neglect." As the Doctor whiffed at his pipe, he inventoried guns, tackle, lunch, hammocks, air-cushions, gigs, frog-spears, and all other necessaries for a day's sport on the river. The result was as he had prophesied,--many things had been omitted. "Now," said he, when the five minutes were up, "we might venture down the bank, which, rest assured, each member of this party will have to climb up again after something left behind."