186 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



Formula for (c) and (d): "This time 1 shall show you two drawings. You will have only ten seconds to look at them, 

 then I shall take them away and you are to draw them, bothjrom memory." 



Before exposing the designs, examiner says: "Ready; look closely." When designs are removed, examiner says: 

 "Go." Designs are exposed with greatest length of page horizontal, and with front of Guide toward examiner. The 

 time limit is 2 minutes, but subject is not stopped or penalized if he appears to have the correct plan and is carrying 

 it out. If the raw score on (a), (b), and (c) together is less than 3, (d) need not be given. 



DEIMOKB FORM BOAHD So- 3. 



Shaded parts lndloat* unfilled epaoes. 



□ 



WOBSTRATIOH. 



□ □ 



FBOELZU B 



□ 



□ □ 



m. b 



Fig. J.— Form board with pieces arranged In various problems for subjert to replace. 



Scoring. — Emphasis is put upon reproduction of the plan of the designs rather than upon the neatness of the draw- 

 ing. Credit as follows : 



1. Two lines crossed, four flags 1 



Correctly facing one another 1 



Accuracy (lines nearly equal, nearly bisected, nearly at right angles; flags nearly square) 1 



Total possible points, 3. 



Large square with two diameters 1 



Four small squares within a large square 1 



3. Two diameters in each small square 1 



4. Sixteen dots, each alone in a small square 1 



5. Accuracy of proportion (width of spaces around the four small squares between \ and i the width of the 16 

 smallest squares) 1 



6. If design is complete but with superfluous squares or lines, count only 3 points. 

 Total possible pointB, 5. 



See Fig. K for some common variations. 



(a) 



(6) 



