ARNOLD ARBORETUM,HARVARD UNIVERSITY.jamaica plain,mass.,...March...18,...1901.Dear Muir:I thank you cordially for your letter of congratulations. They are delightful but previous.The Silva is not finished and very little of the last two volumes is actually written. The publishers have said that it will probably be out during the first half of next year, but before those two volumes see the light of day I must travel many weary miles and repose in many beds which would make that delightful hostelry at Waldo, Oregon, appear like the palace of a sybarite.If you stay quietly in Martinez and think that Canby and I have nothing but fun in hunting Crataegus, that your mind may be disabused of any such idea take the train via the Southern Pacific i...