The educational welfare of children of native and minority groups in continental United States and its outlying parts involves instructional procedures which in recent years are becoming more and more recognized as constituting specialized problems in education. Bilingualism is generally recognized as offering serious instructional difficulties among minority groups, though social and economic adjustment in the homes from which the majority of bilingual children come are necessarily reflected in the conduct and attitudes as well as in progress in the school studies of the children concerned. Research and experimentation concerned with the variety of problems involved in the education of bilingual children is yet quite inadequate to the needs. This bulletin reports a successful experiment in educating children of Mexican extraction extending over a period of years. The situation is probably representative of that in many communities in Southwestern States. It is believed, therefore, that this report of the experiment will be of special interest to teachers and administrators in communities in which Mexican children predominate. It should, however, be almost equally suggestive to schools which children of foreign speaking parents of whatever nationality attend. A bibliography is included. (Contains 19 tables and 4 footnotes.) [Best copy available has been provided.]