“生命和查尔斯达尔文家书”出版于1887年。从那一天起，记者通过各种善意，额外的信件已收到，其中可能会提到达尔文先生写信给先生带夫人德比，休福尔克纳的，弗朗西斯高尔顿先生，赫胥黎，莱尔先生，约翰莫利和缪勒，欧文勋爵普莱费尔，约翰斯考特斯韦茨，威廉爵士特纳，约翰詹纳堰。但是，我们工作中的主要物质组成的一个字母，因为缺少空间或其他原因群众的一部分，并没有在“生活与英皇印。”我们要提请特别注意爵士约瑟夫胡克的信件。达尔文先生对他说的完全自由，这已是个人魅力的东西，以他的信中最技术。也有许多信件，几乎在传记的兴趣不如爵士查尔斯莱尔，弗里茨穆勒先生，赫胥黎先生和华莱士。从这个未使用的材料，我们已经能够编译字母现在首次出版系列的达尔文先生的工作，几乎完整的记录。我们有，但是，在少数情况下，重复段落，或在一个或两个案件全信，从“人生与文学”，似乎在这样的重复或连续性的清晰而必要的。
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    The "Life and Letters of Charles Darwin" was published in 1887. Since that date, through the kindness of various correspondents, additional letters have been received; among them may be mentioned those written by Mr. Darwin to Mr. Belt, Lady Derby, Hugh Falconer, Mr. Francis Galton, Huxley, Lyell, Mr. John Morley, Max Muller, Owen, Lord Playfair, John Scott, Thwaites, Sir William Turner, John Jenner Weir. But the material for our work consisted in chief part of a mass of letters which, for want of space or for other reasons, were not printed in the "Life and Letters." We would draw particular attention to the correspondence with Sir Joseph Hooker. To him Mr. Darwin wrote with complete freedom, and this has given something of a personal charm to the most technical of his letters. There is also much correspondence, hardly inferior in biographical interest, with Sir Charles Lyell, Fritz Muller, Mr. Huxley, and Mr. Wallace. From this unused material we have been able to compile an almost complete record of Mr. Darwin's work in a series of letters now published for the first time. We have, however, in a few instances, repeated paragraphs, or in one or two cases whole letters, from the "Life and Letters," where such repetition seemed necessary for the sake of clearness or continuity.