There are several major changes in the revised edition of the Field Book of Nature Activities that warrant the attention of those who enjoy nature study. In addition to the new chapter entitled Rocks, Minerals and Fossils under the heading Specific Activities Projects, the most significant inclusion is the whole of Part III, Conservation Projects. Here the author outlines a program for soil and water conservation as well as one for forest and wildlife conservation. The rest of the material updated and expanded, deals with nature collections, photographs, observation of wildlife and suggestions for the construction of projects on birds, mammals, reptiles, fish, insects, etc. A companion to other Putnam Field Books, this should be of service to scout leaders, camp counsellors, teachers and any other group interested in nature lore.