38. _Nerve._ Half credit if the slang use is defined, "You've got nerve," etc. 41. _Majesty._ "What you say to a king." (Full credit.) 45. _Sportive._ "To like sports." (Half credit.) "Playful" or "happy." (Full credit.) 46. _Hysterics._ "You laugh and cry at the same time." "A kind of sickness." "A kind of fit." (All full credit.) 48. _Repose._ "You pose again." (Failure.) 52. _Coinage._ "A place where they make money." (Half credit.) 56. _Dilapidated._ "Something that's very old." (Half credit.) 58. _Conscientious._ "You're careful how you do your work." (Full credit.) 60. _Artless._ "No art." (Failure unless correctly explained.) 61. _Priceless._ "It has no price." (Failure.) 66. _Promontory._ "Something prominent." (Failure unless child can explain what it refers to.) 68. _Milksop._ "You sop up milk." (Failure.) 73. _Harpy._ "A kind of bird." (Full credit.) 80. _Exaltation._ "You feel good." (Full credit.) 85. _Retroactive._ "Acting backward." (Full credit.) 92. _Theosophy._ "A religion." (Full credit.) It is seen from the above examples that a very liberal standard has been used. Leniency in judging definitions is necessary because the child's power of expression lags farther behind his understanding than is true of adults, and also because for the young subject the word has a relatively less unitary existence. REMARKS. Our vocabulary test was derived by selecting the last word of every sixth column in a dictionary containing approximately 18,000 words, presumably the 18,000 most common words in the language. The test is based on the assumption that 100 words selected according to some arbitrary rule will be a large enough sampling to afford a fairly reliable index of a subject's entire vocabulary. Rather extensive experimentation with this list and others chosen in a similar manner has proved that the assumption is justified. Tests of the same 75 individuals with five different vocabulary tests of this type showed that the average difference between two tests of the same person was less than 5 per cent. This means that any one of the five tests used is reliable enough for all practical purposes. It is of no special importance that a given child's vocabulary is 8000 rather than 7600; the significance lies in the fact that it is approximately 8000 and not 4000, 12,000, or some other widely different number.