The first part of this text examines the Henrys in Manchester and their role in the chemical industry in the 19th-century. The second half examines other aspects of the chemical industry, chemistry and chemists, including the work of Sir B.C. Brodie and his calculus on chemical operations. 'This book is a welcome addition to the Variorum Collected Studies Series and serves as a timely reminder of the great debt that we owe to a historian of chemistry who pioneered the study of regional themes and lesser events and individuals.' Bulletin of the History of Chemistry, Vol. 22 'Farrar's work is a major contribution not only to the history of chemistry, but to history more generally.' Canadian Journal of History, Vol. XXXIII 'This collection is an important one for historians of chemistry, and for historians of nineteenth-century society, especially in Britain.' Annals of Science, Vol. 56