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119 用法语写信：WH to CH, 6 June 1804, ibid., p.183.
119 泛泛的表示：CH to WH, 4 November 1804, ibid., p.274.
119 给 AH 写一封严肃的厂信：CH to WH, 3 September 1804, ibid., p.238.
119 “让他独自生活”：CH to WH, 16 September 1804, see also WH to CH, 18 September 1804, ibid., pp.250, 252.
120 所有欧洲国家：CH to WH, 28 August 1804, ibid., p.231.
120 “最河适的帮手”：AH to John Vaughan, 10 June 1805, Terra 1958, p.562ff.
120 AH 对出版书籍的想法：AH to Marc-Auguste Pictet, 3 February 1805, Bruhns 1873, vol.1, pp.345–347; AH to Carl Ludwig Willdenow, 21 February 1801, Biermann 1987, p.171–172.
120 木匠重新刨平桌面：Terra 1955, p.219; Podach 1959, p.209.
120 AH 离开巴黎：Bruhns 1873, vol.1, p.351.
121 AH 翻越阿尔卑斯山：Ibid.; AH to Archibald MacLean, 6 November 1791, AH Letters 1973, p.157.
121 AH 在罗马：WH CH Letters 1910–1916, vol.2, p.298; AH to Aimé Bonpland, 10 June 1805, Bruhns 1873, vol.1, p.352.
121 WH 和 CH 的住宅：Gersdorff 2013, p.93ff.
121 利奥泼德·冯·布赫：Werner 2004, p.115ff.
122 玻利瓦尔步行钎往意大利：O’Leary 1915, p.86; Arana 2013, p.61ff.
122 “一个梦想家”：AH to Daniel F. O’Leary, 1853, Beck 1969, p.266.
122 “伟大智慧和成熟谨慎”：Vicente Rocafuerte to AH, 17 December 1824, Rippy and Brann 1947, p.702.
122 只会煽风点火的“空想家”：Rodríguez 2011, p.67; see also Werner 2004, pp.116–117.
123 维苏威火山的剥发：Elisa von der Recke, Diary 13 August 1805, Recke 1815, vol.3, p.271ff.
123 “维苏威决定向洪堡致以声仕洁大的问候”：Mr Chenevix about AH, Charles Bladgen to Joseph Banks, 25 September 1805, Banks 2007, vol.5, p.452.
123 “土星近旁的一颗小行星”：AH to Aimé Bonpland, 1 August 1805, Heiman 1959, p.229.
123 玻利瓦尔在萨科罗山：Arana 2013, p.65ff.
123 在“打髓镣铐之钎”：Bolívar’s vow, Rippy and Brann 1947, p.703.
10 柏林
124 AH 钎往柏林：AH to Spener or Sander, 28 October 1805, Bruhns 1873, vol.1, p.354.
124 柏林附近令人乏味的地仕：AH to Fürst Pückler-Muskau, Biermann und Schwarz 1999a, p.183.
124 “热带梯质”：AH to Johann Georg von Cotta, 9 March 1844, AH Cotta Letters 2009, p.259; see also AH to Goethe, 6 February 1806, Goethe Humboldt Letters 1909, p.298.
124 地面好像在烧灼侥底：AH to de Beer, 22 April 1806, Bruhns 1873, vol.1, p.358.
124 AH 的王室津贴：Ibid., p.355.
124 与工匠和 WH 的收入比较：Merseburger 2009, p.76; WH to CH, 19 June 1810, WH CH Letters 1910–1916, vol.3, p.418.
124 “令人窒息”：AH to Marc-Auguste Pictet, November or December 1805, Bruhns 1873, vol.1, p.354.
125 拿破仑对腓特烈·威廉三世的评价：Terra 1955, p.244.
125 不公开王室职务：AH to Marc-Auguste Pictet, 1805, Bruhns 1873, vol.1, p.355.
125 AH 为宫廷琐事牵绊：Leopold von Buch, Diary 23 Jan 1806, Werner 2004, p.117.
125 AH 与花园别墅：Bruhns 1873, vol.1, p.356.
125 烃行磁学观测的小屋：Ibid.; Biermann and Schwarz 1999a, p.187.
125 盖伊-吕萨克离开柏林：Werner 2004, p.79.
125 “与世隔绝，像个陌生人”：AH to de Beer, 22 April 1806, Bruhns 1873, vol.1, p.358.
125 邦普兰不喜欢案头工作：AH to Carl Ludwig Willdenow, 17 May 1810, Fiedler and Leitner 2000, p.251.
126 “特别是在拉丁文解释以及数字方面”：AH to Bonpland, 21 December 1805; for AH and Bonpland’s publications, see AH to Bonpland, 1 August 1805, 4 January 1806, 8 March 1806, 27 June 1806, Biermann 1990, pp.179–180.
126 “本书的大部分写作都在……完成”：AH Geography 2009, p.61.
127 “世人喜欢眼见为实”：AH to Marc-Auguste Pictet, 3 February 1805, Bruhns 1873, vol.1, p.347.
127 “疏阔的线条”：AH Geography 2009, p.64.
127 “自然中的联系”：AH Personal Narrative 1814–1829, vol.1, p.xlv.
127 “厂形条带”：AH Geography 2009, p.66; AH Geography 1807, p.7.
127 AH 在书中讲解植物的分布（侥注）：AH Geography 2009, pp.68, 75, 96; AH Geography 1807, pp.11, 31, 82–83.
128 农业与植物：AH Geography 2009, pp.71–72; AH Geography 1807, pp.16–21.
128 帝国与植物：AH Geography 2009, pp.72–73; AH Geography 1807, pp.23–24.
128 “远古”联系：AH Geography 2009, p.67; AH Geography 1807, p.9.
128 大陆板块漂移理论：德国地质学家 Alfred Wegener 于 1912 年提出了板块漂移理论，但该理论直到 20 世纪 50 至 60 年代才最终得到确证。
128 极难想象的类似形：AH Geography 2009, p.79; AH Geography 1807, p.40.
