The influence of improvement in one mental function upon the efficiency of other functions: III. Functions involving attention, observation and discrimination.

The functions trained in these experiments were those of observing accurately some detailed features of the words on printed pages.The subject would, for instance, practice marking every word containing the two letters e and s until he attained a considerable improvement in speed and possibly in accuracy as well.Before and after this training he would be tested in marking words containing other combinations of letters, misspelled words, a certain letter printed promiscuously amongst others, words of a certain length, different parts of speech, etc.The quickness of the work was measured by the time taken to do a given amount, or in some cases by the amount done in a given time.The accuracy was measured in two ways, (i) by the number of omissions, and (2) by the proportion of the words 1 Corrigenda.-InTable IV. of the previous article of this series (page 385 of the July number of the REVIEW) there are three errors in computation for which I am responsible.In the 5th column 82.3 should be 92.3 ; in the 6th, 123.3 should be 123.2 ; and in the 8th, 40.3 should be 41.3.In the next to the last Hue of the table 60 becomes 67, and 63, 62.