Albrecht Wilhelm Roth, German botanist
Alfred Brehm, German zoologist
Jean-Jacques Rousseau, French philosopher
Jules Verne, French novelist
Wilhelm Foerster, German astronomer
Ernst von Bergmann, German surgeon
Cicero, Roman philosopher
Sallust, Roman historian
Seneca the Elder, Roman orator
Persius, Roman poet
Heinrich Schliemann, German archaeologist
Carl Merck, German naturalist
Adolf Bastian, German ethnologist
Heinrich Barth, German explorer
Christian Ehrenberg, German naturalist
Carl Ritter, German geographer
Hermann Kolbe, German chemist
Arthur Schopenhauer, German philosopher
Louis Stromeyer, German surgeon, artwork
Hermann von Wissmann, German explorer
Friedrich Jahn, German gymnastics teacher
Bernhard von Gudden, German anatomist
Ernst von Dechen, German geologist
Friedrich von Frerichs, German optician
Robert Brown, Scottish botanist
Ferdinand von Hebra, Austrian physician
Henri Becquerel, French physicist
George Boole, British mathematician
Martin Lichtenstein, German physician
Richard Dawkins, British science writer
Richard Pulteney, British botanist
Crawford Long, US surgeon
Prokop Divis, Czech scientist
Heinrich Dove, Prussian physicist
Heinrich Hertz, German physicist
Georg Ohm, German physicist
John Lindley, British botanist
Agrippa, Roman general
Edward Kelley, English astrologer
19th Century ladies handcar, artwork
Moliere, French playwright
B. F. Skinner, caricature
Albrecht Durer, German artist
19th Century velocipede, artwork
Constantine I, Roman emperor
John Hunter, Scottish surgeon
Jeremy Bentham, British philosopher
Henry Cavendish, British chemist
Charles Coulomb, French physicist
James Joule, British physicist
Joseph Lister, British surgeon
Hans Christian Oersted, Danish physicist
Alessandro Volta, Italian physicist
Charles Darwin, caricature
John Scott Haldane, caricature
Emil Rossmassler, German biologist
Voltaire, French author
William Shakespeare, English playwright
Alfred Wegener, German geophysicist
19th Century washing machine, artwork
Aristotle, Ancient Greek philosopher
John Fothergill, English physician
Steven Pinker, Canadian psychologist
Matt Ridley, caricature
Mary Walker, US surgeon and feminist
Henrik Ibsen, Norwegian playwright
Max Planck, caricature
Marguerite Gardiner, Irish writer
Albert Einstein, Swiss-German physicist
Hermann von Helmholtz, German physicist
Dmitri Mendeleev, caricature
James Clerk Maxwell, caricature
Andre-Marie Ampere, French physicist
Joseph Jackson, English typefounder
William Cuming, Scottish physician
Patrick Moore, British astronomer
John Logie Baird, caricature
George Berkeley, Irish philosopher
James Hutton, British geologist
Robert Oppenheimer, US physicist
Robert Watson-Watt, British physicist
Andrew Wiles, British mathematician
William Cullen, Scottish physician
Brian Cox, caricature
Horatio Nelson, British naval commander
Isaac Asimov, US author and biochemist
Stephen Gould, US palaeontologist
19th Century adjustable school desk
19th Century school desk back support
19th Century penny-farthing, artwork
Victor Hugo, French Author, illustration
Alfred Tennyson, poet, illustration
Xavier Marmier, French author, illustration
Henry Stanley, Anglo-American explorer
Benjamin Franklin, US scientist
J. J. Thomson, British physicist
Ernest Rutherford, caricature
Joseph Lagrange, caricature
Francesco di Giorgio Martini, Italian architect and painter
Christiaan Huygens, caricature
Samuel Pepys, English diarist
Thomas Carlyle, Scottish writer
John Nichols, British antiquarian
William Gifford, British poet and editor
Leonhart Fuchs, German botanist
John Bardeen, US physicist
Linus Pauling, US chemist
Karl Popper, Austrian-British philosopher
Daniel Dennett, US cognitive scientist
John Maynard Smith, caricature
Johann Kaspar Lavater, Swiss theologist
Arthur C. Clarke, British futurist
Wilhelm Fabry, German surgeon
Watt's steam engine, historical artwork
Francisco Pizarro, Spanish explorer
Anne Louise Germaine Necker, French writer
William Penn, English coloniser
Carl Linnaeus, Swedish botanist
Albrecht Thaer, German agronomist
Denis Diderot, French encyclopedist
Etienne Arago, French writer
Richard von Krafft-Ebing, German psychiatrist
John Lubbock, British biologist
Virgil, Roman poet
Niels Bohr, caricature
John Thomas Smith, British antiquarian
Franz Gall, German physiologist
Johann Blumenbach, German anthropologist
Henrich Ruhmkorff, German inventor
Carl Vogt, German naturalist
Jules Verne, French author, 20th C illustration
Georges Cuvier, French zoologist
Louis Pasteur, French microbiologist
19th Century parallel-flow turbine
Christ taking leave of his Mother' by Albrecht Durer
Francis Bacon, English philosopher
Galileo Galilei, Italian astronomer
A. van Leeuwenhoek, Dutch microbiologist
Frank Whittle, caricature
Rosalind Franklin, British chemist
19th Century Tahitian people
Guillaume Carcel, french inventor
Archimedes, caricature
Gaspard Bauhin, Swiss botanist
Luigi Galvani, Italian anatomist
Michelangelo, Italian artist, 19th Century illustration
Thomas Rodd, British antiquarian
Gregor Mendel, Austrian botanist
Johann Jacob Hartlieb, German surgeon
John Evelyn, English author
James Boswell, Scottish author
Sneyd Davies, English poet
Daines Barrington, British judge
Homer, Ancient Greek poet
Thomas Sonnet de Courval, French poet
Alan Turing, British mathematician
Carl Jung, caricature
Sigmund Freud, caricature
James Edward Smith, British botanist
Bernard de Jussieu, French botanist
James Whistler, US painter, 19th C illustration
George Romney, British painter
Frederic Bartholdi, French sculptor
Delaware state flag
August Kekule, German chemist
Georg Riemann, German mathematician
Peach Prunus persica, artwork
Early 19th-century whaleboat
Nerium oleander, 19th century
Gymea lily, 19th century
Strobilantes flowers
Clove plant flowers and fruit
Cinnamon flowers and leaves
Osbeckia chinensis flowers
Cucumber tree fruits
Malay apple flowers and fruit
Purple gentian flowers
Malabar arrowroot flowers and rhizome
Black pepper growing on the vine
Green tea flowers and fruits
East Indian Klugia flowers
Tobacco flowers
Cashew plant fruit and nuts
Water lily (Nymphaea ampla), artwork
19th Century internal combustion engine