The next day he called at 79 -- -- Street.

There was a modest shingle bearing the name "Dr.Gustav Heidenhoff" fastened up on the side of the house, which was in the middle of a brick block.

On announcing that he wanted to see the doctor, he was ushered into a waiting-room, whose walls were hung with charts of the brain and nervous system, and presently a tall, scholarly-looking man, with a clean-shaven face, frosty hair, and very genial blue eyes, deep set beneath extremely bushy grey eyebrows, entered and announced himself as Dr.Heidenhoff.Henry, who could not help being very favourably impressed by his appearance, opened the conversation by saying that he wanted to make some inquiries about the Thought-extirpation process in behalf of a friend who was thinking of trying it.

The doctor, who spoke English with idiomatic accuracy, though with a slightly German accent, expressed his willingness to give him all possible information, and answered all his questions with great apparent candour, illustrating his explanations by references to the charts which covered the walls of the office.

He took him into an inner office and showed his batteries, and explained that the peculiarity of his process consisted, not in any new general laws and facts of physiology which he had discovered, but entirely in peculiarities in his manner of applying his galvanic current, talking much about apodes, cathodes, catelectrotonus and anelectrotonus, resistance and rheostat, reactions, fluctuations, and other terms of galvano-therapeutics.