The book by PRECHT, CHRISTOPHERSEN and HENSEL referred to in the text as the first edition was published in German in 1955 with the title Temperatur und Leben. The present volume is a revised version of this book, constructed along the same lines, but it cannot properly be called the second edition because it is in English. Yet another difference is in the number of contributors, who now include two microbiologists, seven botanists, three zoophysiologists, one biochemist, and three human physiologists. We have again endeavored to treat as many problems as possible but the main theme is still...