93 Herbert Spencer, The Principles of Biology (London: Williams and Norgate, 1864), vol 1., 444.

94 Charles Darwin, “Second Note [July 1838],” “Darwin on Marriage,” Darwin Correspondence Project, University of Cambridge (July 1838), https://www.darwinproject.ac.uk.

95 James Clark, The Sanative Infl uence of Climate, 4th edition (London: John Murray, 1846), 2–4.

96 Charles Darwin, The Autobiography of Charles Darwin, 1809–1882, ed. Nora Barlow (London: Collins, 1958), 115.

97 Ralph Colp Jr., Darwin’s Illness (Gainesville: University Press of Florida, 2008), 45.

98 Darwin, “To Susan Darwin [19 March 1849],” Darwin Correspondence Project

99 Darwin, “To Henry Bence Jones, 3 January [1866],” Darwin Correspondence Project.

100 Darwin, “From T.H. Huxley, 23 November 1859” and “To T.H. Huxley, 16 December [1859],” Darwin Correspondence Project.

101 A.S. MacNalty, “The Ill Health of Charles Darwin,” Nursing Mirror, ii.

102 Charles Darwin, More Letters of Charles Darwin, vol. 2, eds. Francis Darwin and A.C. Seward, https://www.gutenberg.org/files/2740/2740-h/2740-h.htm.

103 William Murrell, “Nitro-Glycerine as a Remedy for Angina Pectoris,” Lancet 113, no. 2890 (January 18, 1879): 80–81.

104 Nils Ringertz, “Alfred Nobel’s Health and His Interest in Medicine,” Nobel Media AB, December 6, 2020, https://www.nobelprize.org/alfred-nobel/alfred-nobels-health-and-his-interest-in-medicine/.

105 Neha Narang and Jyoti Sharma, “Sublingual Mucosa as a Route for Systemic Drug Delivery,” Supplement, International Journal of Pharmacy and Pharmaceutical Sciences 3, no. S2 (2011): 18–22.

106 Janet Browne, Charles Darwin: The Power of Place (New York: Knopf, 2002), 495.

107 World Malaria Report 2019, World Health Organization, https://apps.who.int/iris/handle/10665/330011.

108 F.S. Machado et al., “Chagas Heart Disease: Report on Recent Developments,” Cardiology in Review 20, no. 2 (March– April 2012): 53–65.

109 “Triatominae,” Le Parisien, http://dictionnaire.sensagent.leparisien.fr/Tri-atominae/en-en/.

110 Julie Clayton, “Chagas Disease 101,” Nature 465, S4–5 (June 2010).

111 Clayton, “Chagas Disease 101”; E.M. Jones et al., “Amplifi cation of a Trypanosoma cruzi DNA Sequence from Infl ammatory Lesions in Human Chagasic Cardiomyopathy,” American Journal of Tropical Medicine and Hygiene 48 (1993): 348–357.

112 Saul Adler, “Darwin’s Illness,” Nature 184 (1959): 1103.

113 Charles Darwin, “Chili – Mendoza March 1835,” Charles Darwin’s Beagle Diary, ed. Richard Darwin Keynes (Cambridge: Cambridge University Press, 2001), 315, extracted from Darwin Online, http://darwin-online.org.uk/.

114 Colp, Darwin’s Illness, 143.

115 Ralph Colp Jr., To Be an Invalid: The Illness of Charles Darwin (Chicago: University of Chicago Press, 1977).

116 Colp.

117 Darwin, Autobiography, 79.

118 Darwin, Beagle Diary, Darwin Online, 315.

119 “Historical Medical Conference Finds Darwin Suffered from Various Gastrointestinal Illnesses,” University of Maryland School of Medicine, May 6, 2011, https://www.prnewswire.com/news-releases/historical-medical-conference-finds-darwin-suffered-from-various-gastrointestinal-illnesses-121366344.html.

120 “A 9,000-Year Record of Chagas’ Disease,” Arthur C. Aufderheide et al., Proceedings of the National Academy of Sciences 101, no. 7 (February 17, 2004) 2034–2039.

121 “Historical Medical Conference.”

122 Jasmine Garsd, “Kissing Bug Disease: Latin America’s Silent Killer Makes U.S. Headlines,” National Public Radio, December 8, 2015, https://www.npr.org/sections/goatsandsoda/2015/12/08/458781450/.

123 Garsd, “Kissing Bug”.

124 Alyssa C. Meyers, Marvin Meinders, and Sarah A. Hamer, “Widespread Trypanosoma cruzi Infection in Government Working Dogs along the Texas-Mexico Border: Discordant Serology, Parasite Genotyping and Associated Vectors,” PLOS Neglected Tropical Diseases 11, no. 8 (August 7, 2017).

125 Ariel Roguin. “Rene Theophile Hyacinthe Laënnec (1781–1826): The Man behind the Stethoscope,” Clinical Medicine & Research 4, no. 3 (September 2006): 230–235.

126 L.J. Moorman, “Tuberculosis and Genius: Ralph Waldo Emerson,” Bulletin of the History of Medicine 18, no. 4 (1945): 361–370.

127 William Shenstone, The Poetical Works of William Shenstone (New York: D. Appleton, 1854), xviii.

128 Emily Mullin, “How Tuberculosis Shaped Victorian Fashion,” Smithsonian, May 10, 2016, https://www.smithsonianmag.com/science-nature/how-tu-berculosis-shaped-victorian-fashion.

129 Alexander Liu et al., “Tuberculous Endocarditis,” International Journal of Cardiology 167, no. 3 (August 10, 2013): 640–645.

130 Roguin, “Laënnec.”

131 Roguin, trans. John Forbes.

132 Kirstie Blair, Victorian Poetry and the Culture of the Heart (Oxford: Oxford University Press, 2006), 23–24.

133 M. Jiwa et al., “Impact of the Presence of Medical Equipment in Images on Viewers’ Perceptions of the Trustworthiness of an Individual On-Screen,” Journal of Medical Internet Research 14, no. 4 (2012), e100.

134 R.S. Litwak, “The Growth of Cardiac Surgery: Historical Notes,” Cardiovascular Clinics 3 (1971): 5–50.

135 H.W. Heiss, “Werner Forssmann: A German Problem with the Nobel Prize,” Clinical Cardiology 15 (1992): 547–549.

136 Heiss, “Werner Forssmann.”

137 “Shoe-Fitting Fluoroscope (ca. 1930–1940),” Oak Ridge Associated Universities, 1999, https://www.orau.org/ptp/collection/shoefittingfluor/shoe.htm.

138 Werner Forssmann, Experiments on Myself: Memoirs of a Surgeon in Germany, trans. H. Davies (New York; St. Martin’s Press, 1974): 84.

139 Ahmadreza Afshar, David P. Steensma, and Robert A. Kyle, “Werner Forssmann: A Pioneer of Interventional Cardiology and Auto-Experimentation,” Mayo Clinic Proceedings 93, no. 9 (September 1, 2018): E97–98.

140 K. Agrawal, “The First Catheterization,” Hospitalist 2006, no. 12 (December 2006).

141 Forssmann, Experiments on Myself, xi.