This Calendar is a catalogue of the letters the editors of the Correspondence of Charles Darwin have found to date. Information on the source and location of each letter is given, together with a brief summary of the content. First published in 1985, the Calendar has been amended to take account of recently-discovered material and re-interpretations or re-dating of known letters. A new supplement lists over 1000 amendments to the main body of the text, together with over 500 addenda relating to newly- discovered material.

This volume is part of the definitive edition of letters written by and to Charles Darwin, the most celebrated naturalist of the nineteenth century. Notes and appendixes put these fascinating and wide-ranging letters in context, making the letters accessible to both scholars and general readers. Darwin depended on correspondence to collect data from all over the world, and to discuss his emerging ideas with scientific colleagues, many of whom he never met in person. The letters are published chronologically: volume 25 includes letters from 1877, the year in which Darwin published Forms of Flowers and with his son Francis carried out experiments on plant movement and bloom on plants. Darwin was awarded an honorary LL.D. by Cambridge University, and appeared in person to receive it. The volume contains a number of appendixes, including two on the albums of photograph sent to Darwin by his Dutch, German, and Austrian admirers.

This volume is part of the definitive edition of letters written by and to Charles Darwin, the most celebrated naturalist of the nineteenth century. Notes and appendixes put these fascinating and wide-ranging letters in context, making the letters accessible to both scholars and general readers. Darwin depended on correspondence to collect data from all over the world and to discuss his emerging ideas with scientific colleagues, many of whom he never met in person. The letters are published chronologically: volume 22 includes letters from 1874, the year in which Darwin completed his research on insectivorous plants and published second editions of Descent of Man and Coral Reefs. The year also saw an acrimonious dispute between Darwin and St George Jackson Mivart as a result of an anonymous review the latter had written in which he criticised Darwin's son George.