The stencils, which are supplied with each package of test booklets, should be placed to the left of the five geometrical figures and comparison should be made between the dotted lines of the stencil and the marks made by the candidate in the corresponding figure on the examination sheet. In the first square, for example, full credit should be given whether the line is drawn horizontally or vertically through the figure. The important thing is that two equal rectangles should be created by drawing a single line. Similarly, for each other figure, the important point to be considered is whether or not the lines drawn do form the geometrical figures shown on the left. A little practice will make it possible for the clerk who scores these tests to lay aside the key itself and to carry it in memory. Various forms of this test have been used by psychologists for a number of years, although its most extensive use was in the Beta series of the United States Army. The same test in modified form was used by Prof. E. L. Thorndike in his tests of mental alertness in the air service. Many individuals were found who could do this test fairly well without being able to succeed with some of the others which were supposedly equally as good for general purposes. On the other hand, many individuals of good general ability were found who seemed lacking in the particular type of ability necessary properly to divide these geometrical figures. On the whole, however, the more intelligent men made higher scores than the less intelligent men. Such low relationship between this particular test and other tests of intelligence makes it particularly useful as one of a series to be used for measuring the intelligence of men entering certain mechanical trades where the recognition of the size and shape of objects is of prime importance. Draftsmen, architects, supply clerks, and candidates for similar positions would probably be rated more accurately by this test than would writers, musicians, and academic students. In the public schools such a test might give some indication of the ability of children to succeed in mechanical or mathematical courses of study. In social gatherings, a great deal of amusement might be found by giving prizes to the individuals completing the entire fifteen figures correctly and in the shortest time. It would seem desirable, however, to omit the time limit when it is used for pure entertainment and to measure with a stop-watch the exact amount of time required for the individual. When all had finished the fifteen elements of the test, the papers could be checked up for accuracy and the prize could be given to the one who had finished correctly in the shortest length of time. This will add an element of interest for it is quite certain that some of those who finished first will have made errors, probably through careless execution, and that someone who finished later in the game will have drawn each line correctly.