If Dr. Biron did not possess that theoretical knowledge of insanity which has made French alienists famous throughout the world, he was certainly a first-rate organiser. His sanatorium was a model one. It was situated in one of the wealthiest, quietest and airiest quarters of Paris, and stood in a vast enclosure behind high walls; within this enclosure a number of small pavilions were built, all attractive in design, and communicating by broad flights of steps with a beautiful garden studded with trees and shrubs, but further subdivided into a series of little gardens separated from one another by white latticed palings. "You see, Professor, I rely entirely on the isolation principle. A single block would have involved a deleterious collocation of various types of insanity, so I built this series of small pavilions, where my patients can be segregated according to their type of alienation. The system has great therapeutic advantages, and I am sure it is the explanation of my high percentage of cures." Professor Swelding nodded approval. "We apply the system of segregation in Denmark," he said, "but we have never carried it so far as to divide the general grounds. I see that each of your pavilions has its own private garden." "I regard that as indispensable," Dr. Biron declared. He led his visitor to one of the little gardens, where a man of about fifty was walking about between two attendants. "This man is a megalomaniac," he said: "he believes that he is the Almighty." "What is your treatment here?" Professor Swelding enquired. "I am aware that the books prescribe isolation, but that is not sufficient by itself." "I nurse the brain by nursing the body," Dr. Biron replied. "I build up my patient's system by careful attention to hygiene, diet, and rest, and I pretend to ignore his mental alienation. There is always a spark of sound sense in a diseased brain. This man imagines he is the Almighty, but when he is hungry he has to ask for something to eat, and then we pretend to wonder why he has any need to eat if he is the Almighty; he has to concoct some explanation, and very gradually his reasoning power is restored. A man ceases to be insane the moment he begins to comprehend that he is insane." The Professor followed the doctor, casting curious eyes at the various patients who were walking in their gardens. "Have you many cures?" "That is a difficult question to answer," said Dr. Biron. "The statistics are so very different in the different categories of insanity." "Of course," said Professor Swelding; "but take some particular type of dementia, say, hallucination of persecution. What percentage of cures can you show there?"