Excerpt from Speech Development: A Thesis Presented to the Faculty of the Graduate School of the University of Pennsylvania in Partial Fulfilment of the Requirements for the Degree of Doctor of Philosophy Experiment has been added to observation, and means have been taken to test the vocabulary. For example: If an object is shown to the child and she gives its name, that word is added: to the vocabulary. Of the words in the vocabulary, a large proportion are in frequent use, as shown by the repetitions recorded; some have been used only occasionally; while some have possibly dropped out of the vocabulary, though this would be difficult to ascertain. Various classifications of the steps in speech development have been proposed The babbling period occupies the first few months, usually at least six, and often more. This period has been carefully studied by observers of many nationalities (14 The order of appearance of the various sounds depends somewhat on the language. The babbling period is not considered here, as these observations commenced with the beginning of articulate speech. 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.