Changes in concepts of usage as illustrated in 111 high school English language textbooks published from 1923 to 1963 formed the subject of this study. The textbooks were placed in one of four groups according to publication date: 1923-1940, 1941-1952, 1953-1958, and 1959-1963. The purpose of the grouping was to determine whether certain usage concepts varied from one textbook group to the next and, consequently, to determine whether or not there were any trends among these changes toward or away from the findings of investigations of English usage. The treatment of 14 usage items, which have been in dispute since 1923 and which were discussed in at least half of the textbooks within each group, was checked in each textbook and compared to the findings of other usage studies (Hall, 1917; Leonard, 1932; Marckwardt and Walcott, 1938; Fries, 1940; Evans and Evans, 1957; and Bryant, 1962). The results indicated that the general textbook trend is toward greater agreement with linguistic findings. (Author/JM)