ABSTRACT
How does it happen that children in general learn their mother-tongue so well? That this is a problem becomes clear when we contrast a child's first acquisition of its mother-tongue with the later acquisition of any foreign tongue. The contrast is indeed striking and manifold: here we have a quite little child, without experience or prepossessions; there a bigger child, or it may be a grown-up person with all sorts of knowledge and powers: here a haphazard method of procedure; there the whole task laid out in a system (for even in the schoolbooks that do not follow the old grammatical system there is a certain definite order of progress from more elementary to more difficult matters): here no professional teachers, but chance parents, brothers and sisters, nursery maids and playmates; there teachers trained for many years specially to teach languages: here only oral instruction; there not only that, but reading-books, dictionaries and other assistance. And yet this is the result: here complete and exact command of the language as a native speaks it, however stupid the children; there, in most cases, even with people otherwise highly gifted, a defective and inexact command of the language. On what does this difference depend?
