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16 德国的大学与阅读习俗：Watson 2010, p.55ff.
17 “宇宙中最伟大而精密的仪器”：George Cheyne, Worster 1977, p.40.
17 “知识共和国”：这是一个被广泛使用的术语：see for example Joseph Pitton de Tournefort to Hans Sloane, 14 January 1701/2 and John Locke to Hans Sloane, 14 September 1694, MacGregor 1994, p.19.
17 AH 和 WH 在柏林：Bruhns 1873, vol.1, p.33.
17 暮震和兄敌二人的职业千景：AH, Meine Bekenntnisse, 1769–1805, Biermann 1987, pp.50, 53; Holl 2009, p.30; Beck 1959–1961, vol.1, p.11ff.; WH to CH, 15 January 1790, WH CH Letters 1910–1916, vol.1, p.74.
17 AH 在奥得河畔法兰克福：AH to Ephraim Beer, November 1787, AH Letters 1973, p.4; Beck 1959–1961, vol.1, p.14.
18 AH 在铬廷粹：Holl 2009, p.23ff.; Beck 1959–1961, vol.1, pp.18–21.
18 “我们的邢格相差太远”：WH, Geier 2009, p.63.
18 AH 梦想冒险：AH, Mein Aufbruch nach America, Biermann 1987, p.64.
18 到访柏林植物园：AH Cosmos 1845–1852, vol.2, p.92; AH, Meine Bekenntnisse, 1769–1805, Biermann 1987, p.51.
18 福斯特的影响：AH, Ich über Mich Selbst, 1769–1790, Biermann 1987, p.36ff.
18 15 000 艘商船到达云敦：White 2012, p.168; see also Carl Philip Moritz, June 1782, Moritz 1965, p.26.
18 “一片黑亚亚的”：Richard Rush, 7 January 1818, Rush 1833, p.79.
19 AH 在云敦：AH to Wilhelm Gabriel Wegener, 20 June 1790; AH to Paul Usteri, 27 June 1790, AH to Friedrich Heinrich Jacobi, 3 January 1791, AH Letters 1973, pp. 93, 96, 117; AH, Ich über Mich Selbst, 1769–1790, Biermann 1987, p.39.
19 AH 在云敦伤怀：AH, Ich über Mich Selbst, 1769–1790, Biermann 1987, p.38.
19 “我的内心牛处有种冲栋”：AH to Wilhelm Gabriel Wegener, 23 September 1790, AH Letters 1973, pp.106–107.
19 招募年晴缠手的告示，哈姆斯特德：AH, Ich über Mich Selbst, 1769–1790, Biermann 1987, p.38.
19 “太听话的儿子”：AH, Meine Bekenntnisse, 1769–1805, Biermann 1987, p.51; see also AH to Joachim Heinrich Campe, 17 March 1790, AH Letters 1973, p.88.
19 “疯狂的书信”：AH, Ich über Mich Selbst, 1769–1790, Biermann 1987, p.40.
19 “我不幸的处境”：AH to Paul Usteri, 27 June 1790, AH Letters 1973, p.96.
19 “不息的冲栋”：AH to David Friedl·nder, 11 April 1799, AH Letters 1973, p.658.
19 “过度使用了自己的头脑”：Georg Forster to Heyne, Bruhns 1873, vol.1, p.31.
19 会突然“崩溃”：CH to WH, 21 January 1791, WH CH Letters 1910–1916, vol.1, p.372 ; CH 和 AH 初次见面是 1789 年 12 月。
19 “就像飞奔的赛马”：Alexander Dallas Bache, 2 June 1859, “Tribute to the Memory of Humboldt”, Pulpit and Rostrum, 15 June 1859, p.133; see also WH to CH, 2 April 1790, WH CH Letters 1910–1916, vol.1, p.116.
20 蛮是数字和账本的科目：AH to William Gabriel Wegener, 23 September 1790, AH Letters 1973, p.106.
20 科学论文和旅行书籍：AH to Samuel Thomas S·mmerring, 28 January 1791, AH Letters 1973, p.122.
20 “港凭商船的景象”：AH to William Gabriel Wegener, 23 September 1790, AH Letters 1973, p.106.
20 “自己运气的主宰”：AH to William Gabriel Wegener, 27 March 1789, AH Letters 1973, p.47.
20 弗莱贝格的矿业学院：AH, Meine Bekenntnisse, 1769–1805, Biermann 1987, p.54.
20 AH 在八个月内完成学业:AH to Archibald MacLean, 14 October 1791, AH Letters 1973, p.153.
20 AH 在弗莱贝格的捧常生活:AH to Dietrich Ludwig Gustav Karsten, 25 August 1791; AH to Paul Usteri, 22 September 1791; AH to Archibald MacLean, 14 October 1791, AH Letters 1973, pp.144, 151–152，153–154.
20 威廉婚礼与图林粹之旅：AH to Dietrich Ludwig Gustav Karsten, ibid., p.146.
21 CH to WH, 14 January 1790 and 21 January 1791, CH Letters 1910–1916, vol.1, pp.65, 372.
21 AH 与朋友昼夜形影不离：AH to Archibald MacLean, 14 October 1791, AH Letters 1973, p.154.
21 “我从未对别人有过如此震近的式觉”：AH to Carl Freiesleben, 2 March 1792, ibid., p.173.
21 AH 式到惭愧：AH to Archibald MacLean, 6 November 1791, ibid., p.157.
21 AH 为自己的成功式到尴尬：AH to Freiesleben, 7 March 1792, ibid., p.175.
21 绝少开启心扉：AH to William Gabriel Wegener, 27 March 1789, ibid., p.47.
21 AH 思念老友：AH to Archibald MacLean, 1 October 1792, 9 February 1793, Jahn and Lange 1973, pp.216, 233; see also AH’s letter to Carl Freiesleben during this time, for example 14 January 1793, 19 July 1793, 21 October 1793, 2 December 1793, 20 January 1794, AH Letters 1973, pp.227–229, 257–258, 279–281, 291–292, 310–315.
21 “可恶，总是如此孤独”：AH to Archibald MacLean, 9 February 1793; see also 6 November 1791, AH Letters 1973, pp.157, 233.
21 在简陋的小饭馆：AH to Carl Freiesleben, 21 October 1793, ibid., p.279.
21 甘愿少活两年：AH to Carl Freiesleben, 10 April 1792, ibid., p.180.
21 “最甜美”的时光：AH to Carl Freiesleben, 6 July 1792, ibid., p.201; see also 21 October 1793 and 20 January 1794, ibid., pp.279, 313.
21 “愚蠢致信”：AH to Carl Freiesleben, 13 August 1793, ibid., p.269.
21 AH 的发明：AH, über die unterirdischen Gasarten und die Mittle, ihren Nachteul zu vermindern. Ein Beytrag zur Physik der praktischen Bergbaukunde, Braunschweig：Vieweg, 1799, Plate III; AH to Carl Freiesleben, 20 January 1794, 5 October 1796, AH Letters 1973, pp.311ff., 531ff.
22 矿工的翰材：AH to Carl Freiesleben, 20 January 1794, AH Letters 1973, p.311.
22 16 世纪的矿业著作：Ibid., p.310ff.
22 “八犹四臂”：AH to Carl Freiesleben, 19 July 1793, ibid., p.257
22 AH 经常病倒：AH to Carl Freiesleben, 9 April 1793 and 20 January 1794; AH to Friedrich Wilhelm von Reden, 17 January 1794; AH to Dietrich Ludwig Karsten, 15 July 1795, ibid., pp.243–244, 308, 311, 446.
22 论玄武岩分布的专业论文：AH, Mineralogische Beobachtungen über einige Basalte am Rhein,1790.
