_Type c_ (satisfactory at year VIII). A successful performance at year VIII is characterized by the presence of a plan, but one ill-adapted to the purpose. That some forethought is exercised is evidenced, (1) by fewer crossings, (2) by a tendency either to make the lines more or less parallel or else to give them some kind of symmetry, and (3) by fewer breaks. The possibilities of type _c_ are almost unlimited, and one is continually meeting new forms. We have distinguished more than twenty of these, the most common of which may be described as follows:-- 1. Very rough or zigzag circles or similarly imperfect spirals. 2. Segments of curves joined in a more or less symmetrical fashion. 3. Lines going back and forth across the field, joined at the ends and not intended to be parallel. 4. The "wheel plan," showing lines radiating from near the center of the field toward the circumference. 5. The "fan plan," showing a number of lines radiating (usually) from the gate and spreading out over the field. 6. "Fan ellipses" or "fan spirals" radiating from the gate like the lines just described. 7. The "leaf plan," "rib plan," or "tree plan," with lines branching off from a trunk line like ribs, veins of a leaf, or branches of a tree. 8. Parallel lines which cross at right angles and mark off the field like a checkerboard. 9. Paths making one or more fairly symmetrical geometrical figures, like a square, a diamond, a star, a hexagon, etc. 10. A combination of two or more of the above plans. _Type d_ (satisfactory at year XII). Performances of this type meet perfectly, or almost perfectly, the logical requirements of the problem. The paths are almost or quite parallel, and there are no intersections or breaks. The possibilities of type _d_ are fewer and embrace chiefly the following:-- 1. A spiral, perfect or almost perfect, and beginning either at the gate or at the center of the field. 2. Concentric circles. 3. Transverse lines, parallel or almost so, and joined at the ends. Up to about 4 years most children failed entirely to comprehend the task. By the age of 6 years the task is usually understood, but the search is conducted without plan. Type _c_ is not attained by two thirds before the mental level of 8 years, and score 3 ordinarily not until 11 or 12 years. Grading presents some difficulties because of occasional border-line performances which have a value almost midway between the types _b_ and _c_ or between _c_ and _d_. Frequent reference to the scoring card will enable the examiner, after a little experience, to score nearly all the doubtful performances satisfactorily.