Excerpt from Psychological Monographs, Vol. 24 The 1908 scale (7) was quantitative in character owing to the introduction of the concept of mental age. It included a list of 56 tests grouped according to ages from 3 to I 3, each group containing from four to eight tests. Most of the tests of the 1905 series were included, the additions including in a large measure tests of a scholastic nature. The authors gave directions for applying the series and for computing the resultant mental age. A Child testing three years below his chronological age was to be considered defective. Although the scheme of the 1908 series was entirely quantita tive, the authors did not discard the qualitative idea, and they cautioned against the application of the scale in the manner of a measure of height or weight. The border line between the idiot and the imbecile was fixed by the ability to use and compre hend spoken language. The imbecile was differentiated from the moron by the use of written language, illiteracy being di' About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.