144 



MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



[Vol. XV, 



Test U, arithmetical reasoning. 



Say to subject, "If a man buys cents worth of postage stamps at the post office and pays a (dime, quarter, 



half dollar, dollar), how much change does he get back?" 



Series of Problems. 



Time for each problem, 15 seconds. 



One series of these simple problems is to be given. If they are readily solved, subject should be teBted further 

 with one of the following problems: 



le. If a man's salary is $20 a week and he spends $14 a week, how long will it take him to save $300? 



2e. If 2 pencils cost 5 cents, how many pencils can you buy for 50 cents? 



3e. At 15 cents a yard, how much will 7 feet of cloth cost? 



4e. Six men can dig a trench in three days. How many men will it take to dig it in half a day. 



5e. If a man buys two cigars at 7 cents each and a pipe for 65 cents, how much change should he get from a $2 bill? 



Time for each problem, 1 minute. 



Test V, code learning. 



Materials. — Accompanying sample code and five test codes, designated by numbers. 



Directions. — Examiner shows subject the sample code, saying, "These lines (illustrating with pencil drawings 

 of symbols) are used to represent letters in a kind of secret writing." Examiner now shows how the word son may 

 be written with the code symbols. Then he says, "Now I am going to show you a form in which different letters 

 are used. Study it carefully until I take it away." Examiner presents one of the five codes for 20 seconds. He then 

 places before subject a sheet of paper on which the letters from e to m (in alphabetical order) have been written in 

 advance, and says, "Put the lines which stand for it around each letter." 



(N. B. — Examiner must not allow subject to redraw the code figure from memory.) 



Scoring. — On the record blank examiner enters a symbol, -f- or — , according to whether the response is correct 

 or incorrect. The total number of correct responses is also to be recoided. 



Time for work in writing the symbols, 2 minutes. 



