This test is of our own invention and has been brought to its present form only after a good deal of preliminary experimentation. It correlates fairly well with mental age as determined by the scale as a whole. It was passed by 55 per cent of high-school pupils and by 65 per cent of unschooled business men. Success in it is thus seen not to depend upon schooling. AVERAGE ADULT, 5: REPEATING SIX DIGITS REVERSED The series used are: 4-7-1-9-5-2; 5-8-3-2-9-4; and 7-5-2-6-3-8. PROCEDURE and SCORING, as in year VII, alternative 2. REMARKS. The test is passed by approximately half of "average adults" and by three fourths of "superior adults." It shows no effect of schooling, the uneducated business men even surpassing our high-school students. For the higher levels of intelligence, especially, the test is superior to that of repeating digits in the direct order. It is less mechanical and makes heavier demands upon higher intelligence. AVERAGE ADULT, 6: USING A CODE PROCEDURE. Show the subject the code given on the accompanying form. Say: "_See these diagrams here. Look and you will see that they contain all the letters of the alphabet. Now, examine the arrangement of the letters. They go_ (pointing) _a b c, d e f, g h i, j k l, m n o, p q r, s t u v, w x y z. You see the letters in the first two diagrams are arranged in the up-and-down order_ (pointing again), _and the letters in the other two diagrams run in just the opposite way from the hands of a clock_ (pointing). _Look again and you will see that the second diagram is drawn just like the first, except that each letter has a dot with it, and that the last diagram is like the third except that here, also, each letter has a dot. Now, all of this represents a code; that is, a secret language. It is a real code, one that was used in the Civil War for sending secret messages. This is the way it works: we draw the lines which hold a letter, but leave out the letter. Here, for example, is the way we would write 'spy?'_" Then write the word _spy_, pointing out carefully where each letter comes from, and emphasizing the fact that the dot must be used in addition to the lines in writing any letter in the second or the fourth diagram. Illustrate also with _war_. Then add: "_I am going to have you write something for me; remember now, how the letters go, first_ (pointing, as before) _a b c, d e f, g h i, then j k l, m n o, p q r, then s t u v, then w x y z. And don't forget the dots for the letters in this diagram and this one_" (pointing). At this point, take away the diagrams and tell the subject to write the words _come quickly_. Say nothing about hurrying. The subject is given a pencil, but is allowed to draw only the symbols for the words _come quickly_. He is not permitted to reproduce the entire code and then to copy the code letters from his reproduction.