who were suspected of having given false names. The entire staff consists of ten persons. It is difficult to rightly interpret the figures given in the pamphlet (4) at pp. 22-24, as they appear to disagree, but as I understand them, 562 prisoners who gave false names in the year 1890 were recognised by _Bertillonage_, and only four other persons were otherwise discovered to have been convicted previously, who had escaped recognition by its means. I had the pleasure of seeing the system in operation in Paris a few years ago, and was greatly impressed by the deftness of the measuring, and with the swiftness and success with which the assistants searched for the cards containing entries similar to the measures of the prisoner then under examination. It is stated in the _Signalements_ (p. 12) that the basis of the classification are the four measurements (1) Head-length, (2) Head-breadth, (3) Middle-finger-length, (4) Foot-length, their constancy during adult life nearly always [as stated] holding good. Each of these four elements severally is considered as belonging to one or other of three equally numerous classes--small, medium, and large; consequently there are 3{4} or 81 principal headings, under some one of which the card of each prisoner is in the first instance sorted. Each of these primary headings is successively subdivided, on the same general principle of a three-fold classification, according to other measures that are more or less subject to uncertainties, namely, the height, the span, the cubit, the length and breadth of the ear, and the height of the bust. The eye-colour alone is subjected to seven divisions. The general result is (pp. 19, 22) that a total of twelve measures are employed, of which eleven are classed on the three-fold principle, and one on the seven-fold, giving a final result of 3{11} x 7, or more than a million possible combinations. M. Bertillon considers it by no means necessary to stop here, but in his chapter (p. 22) on the "Infinite Extension of the Classification," claims that the method may be indefinitely extended.