Page 7 Frederick Banting: Hulton Archive/Getty Images; Case VI insulin patient: Wellcome Images.
Page 8 Gray's Anatomy: ? King's College London/Mary Evans Picture Library; Charles Byrne skeleton: ? Ken Welsh/Bridgeman Images; dissecting room at St George's Hospital with Henry Gray: Wellcome Collection.
第二部分
Page 1 Walter Bradford Cannon: Wellcome Collection; Peter Medawar: Bettmann/Getty Images; Richard Herrick: Bettmann/Getty Images.