Professor Opdyke almost never was betrayed into the sin of talking shop. Upon the rare occasions that he gave himself the privilege, save to his classes, he insisted upon but one congenial hearer, and that that one should be with him behind closed doors. More and more often, as the second winter of his acquaintance with Brenton went on, he chose Brenton as the one hearer he allowed himself. This was partly by reason of Brenton's interest in Reed, for, whatever his habit with his chemistry, it must be confessed that Professor Opdyke talked in season and out about his son. Partly, too, it came by way of Professor Mansfield whose introduction of Brenton would have been the _Open, Sesame_ to any sanctum in America. Most of all, though, it came from Brenton himself, from the young rector's manifest enthusiasm for all that went under the name of chemistry, an enthusiasm based, as Professor Opdyke made prompt discovery, upon no mere smattering of knowledge. Bit by bit, then, the professor lowered the guard he had built up before his holy places, relaxed the vigilance of his watch upon them lest they should be invaded by the careless feet of those that did not comprehend. Scott Brenton did comprehend. To him, experimenting was an act of reverence, not a deed of idle curiosity. The world-laws were, to him, full of purpose, albeit only half revealed; and blessed was he who should assist in the revealing. Brenton, listening, talking in his turn, sometimes questioning, sometimes uttering a trenchant bit of argument, felt the old impulses stirring within him, felt the old love of science renewing its hold upon his heart and brain. Not that he regretted his holy calling; at least, not yet. It was a goodly privilege to be allowed to set forth to all men the modern, elastic gospel of good will coupled with a bowing acquaintance with the sciences. Much might be done, that way, he told himself, while steadily he disregarded the voices whispering in his ears that he was offering his parishioners a set of pretty painted toys instead of the rugged, vital facts of universal law. Still, the toys were prettier and vastly more refined than were the old-time goblins of his mother's day, the goblins marched to and fro persistently by half a score of Parson Wheelers in their time. Those were monstrosities, palpably of human creation and yet in the likeness of no mortal thing. The toys he offered to his people were at least shaped and coloured into dainty imitation of existing facts. So far as he helped on the substitution, he was a benefactor to all mankind. And yet, it would have been good to bare his hands and arms, and with them grasp and wrestle with the naked facts, elusive facts, despite their ruggedness. Nevertheless, he bravely smothered his desires. He even, and to himself, professed to ignore the way they multiplied, after an afternoon in the society of Professor Opdyke. However, ignore them as