The editors are to be commended for obtaining the contributions of 39 outstanding experts in the field of allergy, from different locations of the United States, Alaska, Canada, Mexico, and Cuba. Each contributor wrote a short survey of his respective area and evaluated the geographical, social, climatologic, botanical, and environmental factors that are pertinent to his particular region as they affect allergic patients. Each chapter has valuable data on dispersal of pollen and mold spores, pollen incidence, prevailing winds and weather, vegetation, occupations and industries, various types of air contaminants, allergic factors peculiar to the region, and social and educational facilities. The book is well organized and easy to comprehend, but if the charts were all standardized it would simplify the comparison of areas. Most texts on allergy have some of the material found in this book, but now, for the first time, a single volume containing a complete, comprehensive,