D Dams, 101 Danti, Giovanni Battista, 96, 97 d’Aragona, Cardinal Luigi, 151 Darwin, 105 d’Auvergne, Madelaine, 153 David, statue of, 106 _De Ludo Geometrico_, 134 d’Este, Beatrice, 60, 61, 69, 86 d’Este, Isabella, 86, 87, 91 Diocletian, Emperor, 135 Diseases, 109 Dissection, 53, 126, 145 Diver’s suit, 89 Drawing, _see_ Painting Drum, mechanical, 61 Dynamics, 140 E Earth, the, 104, 105 Eclipse of the sun, 48 Einstein, 153 Equilibrium, 141 Euclid, 54, 91 Eye, the, 54, 55 F Ferdinand, King of Naples, 25, 27 Ferrara, 70 Ferrari, Ambrogio, 42 Fiesole, 111, 113, 156 Flemish painters, 15 Flight, of arrow, 82, 83 of birds, 24, 65, 66, 76, 99, 119 problems of, 70, 71, 75, 76, 96-100, 111-113 Florence, 7-19, 25-27, 32, 38, 53, 68, 93-96, 100-103 Flying machine, 70, 71, 75, 76, 112 Foix, Gaston de, 127 Forts, 88 Forum of the Caesars, 134 Four elements, 48 France, 67-69, 78, 82-84, 94, 114-120, 125, 127, 128, 139, 142-145, 152 Francis I, 143-145, 148-157 Fraternity of the Immaculate Conception, 43, 44, 47 Friction, 140, 141 G Galen, 52, 53 Galileo, Galilei, 134, 141, 160 Genoa, 143 Geocentric theory, _see_ Ptolemaic theory Geography, 18, 19 Geology, 103, 104 Geometry, 91, 134 Georg, 131, 133, 140, 143, 145 Geotropism, 79 Germany, 47, 69 Ghirlandaio, Domenico di Tommaso del, 33 Giocondo, Francesco del, 98 Giovanni “the Piper,” 100 Gonzaga, Francesco, 86 Gothic tradition, 50 Gravity, 140, 141 Greeks, the, 69 Guido, 23 Guild, 19 H Hadrian, Emperor, 130 Harvey, William, 126, 160 Heavens, observation of, 80 Heliocentric theory, 48, 81 Heliotropism, 79 Highmore, 53 Hippocrates, 52 Holy Roman Empire, 9 Hooke, Robert, 141 Horse, anatomy of the, 41 Hydraulic pump, 74, 122, 123 Hydraulics, 14 Hydrodynamics, 141 Hygrometer, 30, 31 I Imola, 95, 96 Inclination gauge, 66, 67 India, 18 _Introduction to Perspective, or the Function of the Eye_, 58 Inventions, 25-27, 38-40 Irradiation, 55 Irrigation, 101 Isabella of Aragon, 51 Isonzo river, 88 Istanbul, _see_ Constantinople J Johannes, 133, 143, 145 Judas, 74, 77, 78 K King Charles VIII, 67-69, 78, 82, 120, 148