Microdiffusion analysis is a significant advancement in modern analytical techniques. It involves allowing gaseous products of reactions to diffuse into an absorbent in a closed chamber, a method that has not been widely used earlier. Conway's technique uses a simple glass apparatus called the 'Unit', consisting of an inner and outer chamber. The gaseous product diffuses from the first chamber to the second, where it is absorbed. The accuracy of the method is limited by the precision of delivering and titrating volumes of about 1 ml. The technique is used for analyzing various substances, including ammonia, amides, amines, and others. The book describes the 'Unit', physico-chemical factors, micro-pipettes, and errors involved. It also covers analytical methods using micro-diffusion and has a valuable section on volumetric titration errors. The book is well-illustrated and recommended for biochemists and clinicians. "Archaeology and Society" by Grahame Clark is a welcome new edition of a well-known book. It provides an introduction to archaeology, relating themes to their present-day context. Archaeology studies how people lived in the past, using documentary history and natural sciences. Clark's chapters on archaeological discovery, preservation, and chronology are particularly valuable. He also discusses the importance of maintaining research free from nationalism. "Faraday's Encyclopedia of Hydrocarbon Compounds" covers compounds up to January 1, 1947. It follows previous volumes and includes a note about future volumes using the Dyson cipher. Some nomenclature issues are noted but not as criticism. "The Yearbook of the Universities of the Empire, 1947" provides information on universities in the British Empire. It includes directories, reports, and appendices on admissions, foreign students, and Anglo-American professorships. The book has grown in size due to university expansion.Microdiffusion analysis is a significant advancement in modern analytical techniques. It involves allowing gaseous products of reactions to diffuse into an absorbent in a closed chamber, a method that has not been widely used earlier. Conway's technique uses a simple glass apparatus called the 'Unit', consisting of an inner and outer chamber. The gaseous product diffuses from the first chamber to the second, where it is absorbed. The accuracy of the method is limited by the precision of delivering and titrating volumes of about 1 ml. The technique is used for analyzing various substances, including ammonia, amides, amines, and others. The book describes the 'Unit', physico-chemical factors, micro-pipettes, and errors involved. It also covers analytical methods using micro-diffusion and has a valuable section on volumetric titration errors. The book is well-illustrated and recommended for biochemists and clinicians. "Archaeology and Society" by Grahame Clark is a welcome new edition of a well-known book. It provides an introduction to archaeology, relating themes to their present-day context. Archaeology studies how people lived in the past, using documentary history and natural sciences. Clark's chapters on archaeological discovery, preservation, and chronology are particularly valuable. He also discusses the importance of maintaining research free from nationalism. "Faraday's Encyclopedia of Hydrocarbon Compounds" covers compounds up to January 1, 1947. It follows previous volumes and includes a note about future volumes using the Dyson cipher. Some nomenclature issues are noted but not as criticism. "The Yearbook of the Universities of the Empire, 1947" provides information on universities in the British Empire. It includes directories, reports, and appendices on admissions, foreign students, and Anglo-American professorships. The book has grown in size due to university expansion.