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This text, pleasingly concise, presents the etiologic relationship of plant pollen to hay-fever, and mentions for each state of the United States the particular plant pollen seasonally associated with hay-fever. Although the title implies a discussion of asthma, very little mention of this disease is made in the text. The preventive control of hay-fever, and its treatment are presented adequately. The book is a useful guide in determining the offending pollen, and in the treatment of hay-fever patients.