The purpose of this guide is to assist Latin and English teachers with some background in Latin to expand the English vocabulary and reading skills of students through the study of Latin roots, prefixes, and suffixes. The introductory material in the guide provides general notes on the teaching of Latin in the Philadelphia School District, suggestions for scheduling and staffing the Latin classes, an outline of the organization of each lesson, some general hints to the teacher, and an overview of the material to be taught in the unit. The 13 lessons are designed also to familiarize the students with aspects of classical culture, specifically Latin utterances connected with the signs of the Zodiac, and the mythological sources of scientific information related to the Zodiac. Elements of basic Latin grammar, particularly the structural concept of subject-object-verb, and vocabulary building exercises are introduced in an audiolingual approach. Each lesson details the objectives, and includes class activities, review exercises, explanations, and word games. The final section of the guide consists of a number of pen-and-ink drawings suitable for mounting. (AMH)