JDH clarifies that he is not the source of a request for Asa Gray to review his publication GENERA PLANTARUM. Especially as he is under the impression Gray would have nothing complimentary to say about his work on the order Rubiaceae, despite the effort JDH has put into & his belief that he has corrected more mistakes than he has made. He notes that [Sir William Turner] Thiselton-Dyer corrected the work before it went to press. JDH has just returned from a tour of the left bank of the Rhine, Eifel country [volcanic region of Germany], with his wife [Frances Hooker nee Henslow], [John] Lubbock & the Grant-Duffs. They also saw Luxembourg & Treves [Trier]. JDH has asked the publisher, Longman, to send Gray a copy of Decaisne & Le Maout [A GENERAL SYSTEM OF BOTANY DESCRIPTIVE AND ANALYTICAL]. JDH is currently working on the FLORA OF BRITISH INDIA with Thiselton-Dyer but they are hampered by shortcomings in [Carl Friedrich Philipp von] Martius' work & the illness of [Michael Packenham] Edgeworth & [Thomas] Thomson. [George] Bentham is currently working on Mimosaceae for Martius' work. A young man who works for Micheli, of Geneva, is at RBG Kew working on Onograceae & Rubiaceae. Bibb has sent RBG Kew a collection of Illinois plants. JDH hopes to go on holiday to the Auvergne with [Thomas Henry] Huxley. JDH also has much to do reforming business procedures at the Royal Society & arranging the Society's move to new apartments.