Information about hand lenses and their use in the classroom and out-of-doors for curriculum enrichment is presented in this paper. Some basic attributes of the hand lens, including shape, focal length, and magnification power, are described. Directions for making holders for the lenses in the classroom are given. Two classroom activities and 14 activities which may be carried out on school grounds are suggested as representative of the many kinds of observations that can be made with a hand lens. It was noted that, to the classroom teacher, the world of the hand lens can open up unlimited opportunities for curriculum enrichment. (PS)