Written for ""the sneezers, wheezers, scratchers and assorted allergics."" For the 15% of the American population who are afflicted. First the history of the science which was recognized as such at the turn of the century, the chemistry of allergic reactions; then the 39 substances which are involved; diagnosis and treatment. Fundamental unity underlying the multiplicity of allergic phenomena, basic hypersensitiveness. A doctor and writer supplement each other, the authority of the one, the humor of the other. Market -- those personally and individually concerned to extent of reading it up for themselves, doctors away from medical contacts and centers, nurses, etc. Specialized.