The Unseen World of Plants"" made visible in 84 black-and-white photographs by William Harlow, ""demonstrating the broad diversity of forms, patterns and textures present in familiar plants, trees and flowers."" Dr. Harlow used 35mm. and 2fl"" by 2fl"" format cameras, in most cases with close-up lenses. The accompanying text includes a brief description of the evolutionary stage represented by plants. Of aesthetic and scientific interest.