This course guide is intended for classroom use by teachers of secondary level science to Spanish-speaking students of English as a second language (ESL). Both science instruction and acquisition of English scientific terminology are emphasized, within the framework of increasing overall student proficiency in English. The book is prefaced with a rationale to guide the teacher. Units present drills in repetition, substitution, and question answering. Topics covered include the metric system, matter and temperature, solutions, the microscope, the cell, mitosis, genetics, taxonomic classification, record breakers among animals, the human ear, the skeletal system, digestion, flowers and seeds, the structure of the earth, the water cycle, oceanography, astronomy, anthropology, and space exploration. Ample illustrations are provided,, laboratory activities are described, and Spanish translations of many assignments are provided to assist the student in mastering new terminology. (JB)