WORD COUNTS WERE MADE TO COMPARE THE VOCABULARIES IN READING, HEALTH, SCIENCE, AND ARITHMETIC TEXTBOOKS FOR GRADES ONE TO THREE. COUNTS WERE MADE IN SEVEN DIFFERENT BASIC READING SERIES AND IN THREE DIFFERENT SERIES IN EACH OF THE THREE CONTENT AREAS. THE LIMITATIONS OF THE WORD COUNTS ARE SPECIFIED. FREQUENCY OF OCCURRENCE WAS USED TO ANALYZE THE DATA. THE SEVEN READING SERIES INTRODUCED ABOUT TWICE AS MANY NEW WORDS AT THE THIRD-GRADE LEVEL THAN DID THE THREE SCIENCE SERIES. OF THE 570 NEW WORDS PRESENTED IN THE FIRST-GRADE READING SERIES, 117 WORDS WERE COMMON TO ALL SERIES. THE WORDS USED IN DIFFERENT READING SERIES VARIED MORE AT THE HIGHER GRADE LEVELS. ONLY 11 WORDS WERE COMMON TO THE READING AND ARITHMETIC SERIES AT THE FIRST GRADE LEVEL. OTHER RESULTS, CONCLUSIONS, AND ONE REFERENCE IS INCLUDED. THIS ARTICLE APPEARED IN "THE READING TEACHER," VOLUME 20, NOVEMBER 1966. (BK)