When attacking, they at once make for the right arm, so as to guard against a pistol bullet, and they are also trained to refuse food except from the hands of those they know, so as to safeguard them against poisoning. As a proof of their efficiency, Mademoiselle Clary informed the writer that one of her police dogs had captured nine apaches in one night. Last year a demonstration was given in London before the most eminent representatives of the Metropolitan police force, the apache being represented by a man thickly padded to protect him from the teeth of the dogs. When the man attempted to escape over a screen representing a wall the great hound, "Max," promptly caught him and dragged him down again, as is shown in the accompanying photograph which is here reproduced by permission of Mdlle. Clary and the _Daily Mirror_. The dog also easily cleared this wall, which was 8 ft. 10 in. high, in one bound, and captured a "padded apache" as he climbed down on the other side. [Illustration: FRENCH POLICE DOG _By kind permission of Mdlle. Clary and "The Daily Mirror"_] Police dogs trained on these lines have for some time past been used to assist the police in Glasgow, and within the last few months Nottingham has strengthened its police force by the addition of dogs. The dogs used in this country are powerful cross-bred animals of the Airedale terrier type, specially reared and trained by Major Richardson. The first dog used for the purpose in this country was given to the Berkshire Constabulary, and its duties are to accompany a policeman on his rounds at Windsor, to protect him from attack, and, if necessary, to capture escaping criminals. From two to three months are required to train the dogs for this purpose. In what may be described as circumstantial detection a very faint clue has sometimes resulted in the discovery of a criminal. One of the most striking examples of the kind was seen in 1864, when a gentleman named Briggs was murdered on the North London railway, for the sake of his watch and money. The murderer succeeded in escaping without having been noticed by anyone, and the crime would probably have made another in the long list of unsolved mysteries, but for several slips that were made by him. He had changed hats with his victim and his soft felt hat, which was found upon Mr. Briggs, was one of the chief factors in his subsequent identification. Hats of this particular shape, by the way, were for many years afterwards popularly known as "Müllers." The watch and chain of the murdered man were soon traced to the shop of a London jeweller, who stated that he had given another watch and chain in exchange for them. He remembered the man and was able to give a description of his appearance, although he had no knowledge of his name or whereabouts. At this point all further signs of the trail were lost, for all efforts to discover the jeweller's customer proved fruitless.