But this thumb print possibility in commercial papers has its greatest future in the positive identification which either thumb or finger print carries with it. Criminologists all over the world have satisfied themselves of the absolute accuracy of the finger print identification. It would be hard to figure just how many Constantines were arrested or kept under surveillance following the horrible murder in Chicago, the suspicions aroused by personal resemblances to the criminal's photograph and especially by the prominent gold tooth of the man. But in a criminal's finger print the merest novice anywhere in the world may take an ink impression of the fingers of the suspected criminal, and if these prints should be in the bureau of identification at Scotland Yard, with its 100,000 records of individuals, the man would be identified positively within half an hour--identified not only by the experts of the bureau, but an ordinary citizen would be an authority in attesting the proof. This is a suggestion of the absolute accuracy of identifications on commercial paper. At the present time traveling salesmen who spend much money and who wish to carry as little as possible of cash with them, have an organized system by which their bankable paper may be cashed at hotels and business houses over the country. APPLIED TO IMMIGRANTS. Major R. W. McClaughry, warden of the federal prison at Leavenworth, sees in the finger print system a possibility which might be taken cognizance of by the government at Ellis Island. With the millions of immigrants who have come and who still are to come to these shores, the finger print requirement would simplify many of the tangles of many kinds which result from this inrush of foreign population. Aside from the fact that many of this country's criminals are foreign born, it remains that civil identifications of such people are matters of great moment. Titles and estates have hung in the balance of incomplete identifications of persons who are claimants in the United States. Fifty years after a finger print is registered that same finger, or group of fingers, will prove the personality of the one registering. In case of accidents of many kinds one hand or the other is most likely to escape mutilation, and a post-mortem imprint of the fingers still is proof of identity. The finger print system is being taken up more rapidly than was the Bertillon, largely owing to the fact that police departments, recognizing that a scientific system gives far greater results and can in no way be compared with the old method of describing criminals, by color, age, height, weight, eyes, hair, etc., are more willing than formerly to intelligently investigate and test new methods.