The correspondence in this volume reveals Darwin carefully monitoring the response to The Origin of Species. Early in 1861 he completed the preparation of a third and much-revised edition, using the opportunity to answer his critics. As these letters make clear, Darwin understood the importance of support from younger scientists for the future of his theory. Darwin's long-time supporters - including Asa Gray, Charles Lyell and Joseph Dalton Hooker - also feature largely in his correspondence. Escaping the confines of collating and writing up his work on variation in domesticated animals and plants, Darwin plunged into detailed studies of insectivorous plants and orchid pollination. On a more personal side, the correspondence details Darwin in the role of solicitous father ensuring a secure future for his son William. The letters in Volume 9 provide another indispensable collection for those interested in Darwin's life, work and world.