A special biological and anthropological interest attaches to the child’s first essays in the use of words. Language is that which most obviously marks off human from animal intelligence. One of the most interesting problems in the science of man’s origin and early development is how he first acquired the power of using language-signs. If we proceed on the biological principle that the development of the individual represents in its main stages that of the race, we may expect to find through the study of children’s use of language hints as to how our race came by the invaluable endowment. How far it is reasonable to expect from a study of nursery linguistics a complete explanation of the process by which man became speechful, _homo articulans_, will appear later on. But an examination of these linguistics ought surely to be of some suggestive value here. While there is this peculiar scientific interest in the first manifestations of the speech-faculty in the child, they are of a kind to lend themselves particularly well to a methodic and exact observation. Articulate sounds are sensible objects having well-defined characters which may be accurately noted and described where the requisite fineness of ear and quickness of perception are present. The difficulties are no doubt great here: but they are precisely the difficulties to sharpen the appetite of the true naturalist. Hence we need not wonder that early articulation fills a large place in the naturalist’s observation of infant life. Preyer, for example, devotes one of the three sections of his well-known monograph to this subject, and gives us a careful and elaborate account of the progress of articulation and of speech up to the end of the period dealt with (first three years). Since these studies are especially concerned with the characteristics of the child after language has been acquired I shall not enter into the history of his rudimentary speech at any great length. At the same time, since language is a realm of activity in which the child betrays valuable characteristics long after the third year, it deserves a special study in this volume. As everybody knows, long before the child begins to speak in the conventional sense he produces sounds. These are at first cries and wanting in the definiteness of true articulate sounds. Such cries are expressive, that is, utterances of changing conditions of feeling, pain and pleasure, and are also instinctive, springing out of certain congenital nervous arrangements by which feeling acts upon the muscular organs. This crying gradually differentiates itself into a rich variety of expressions for hunger, cold, pain, joy and so forth, of which it is safe to say that the majority of nurses and mothers have at best but a very imperfect knowledge.