LIST OF ILLUSTRATIONS. 



Fig. Page 



Michael Faraday Front. 



Egypt (heading) I 



i^ Primitive Bread-making 3 



**av The Pyramid of Cheops 7 



3. Thales" geometrical discovery 8 



4 Squares on a right-angled Triangle.. 13 



5. The Monochord 14 



6. Plato 21 



7. Hippocrates of Cos 31 



The Parthenon 32 



8. Alexandrian Mathematicians 33 



9. Diagram 37 



10. Do 37 



ti. Do 38 



12. Do 39 



i/*--Screw of Archimedes 41 



14. Sections of a Cone 43 



15. Rulers of Nicomedes 44 



16. The Ruins of the Colosseum at 



Rome 46 



17. Diagram 49 



18. Hypatia 52 



Temple of the Sun, Bualbec 52 



19. A Hall in the Alhambra 53 



20. Baghdad 57 



21. The Astrologer 59 



22, Diagram 61 



23. A Court in the Alhambra 64 



24. Roger Bacon ^ 66 



25. Roger Bacon's House at Oxford 68 



26. Mariner's Compass 70 



27. The Cathedral of Amiens (isth 



Century) 72 



28. The Present Aspect of Constanti- 

 nople 74 



29. The Alchemist 76 



30. Ars longa, Vita brevis 77 



31. Alembic and Receiver 79 



32. Ditto, with Movable Head 80 



A Monastic Student 80 



33. Copernicus 8r 



34. Tycho Brahe 86 



35- Tycho Brahe's House and Observa- 

 tory 



36. Kepler 



37. Diagram 



38. Armature of Loadstone 



3Q^4- Groups of Iron Filings 

 -"ifi. Gilbert composing his Treatise on 



M agnetism 



42. Diagram .' 



43. Paracelsus 



44. Agricola 



45. Bernard Palissy .'.'.'.'.'.'................ 



Tail-piece 



46. Galileo .'".'"".'.'" 



47.-X"jalileo's Air-Thermometer ....... 



(4$. View of Florence 



49. Interior of St. Peter's at Rome '.".' 

 50. Galileo's Villa 125 



Fig. Page 



51. Francis Bacon 126 



52, 53. The Guinea and Feather Experi- 

 ment 139 



54. Statue of Francis Bacon in West- 

 minster Abbey 141 



55. Descartes 143 



56. Diagram 130 



57. Ditto 152 



5JJ^XLaw of Refraction 155 



^59^60. Lenses 156 



61, 62, 63 Paths of Rays 157 



64. Combination of two Lenses 158 



65. Workman grinding Lenses 159 



.volving Tool for grinding Lenses 160 



. Diagram 160 



. Torricelli 166 



69. Galileo and the Well-sinkers 167 



70. Torricelli's Experiment 168 



71. Blaise Pascal 169 



72. Von Giiericke 171 



73.^Guericke's Air-Pump 172 



^TA, 75.-r-Ditto 173 



76. Modern Air-Pump 174 



77. The Magdeburg Experiment on the 



large scale 176 



78. Torricelli (another Portrait) 179 



79 Sir Isaac Newton 180 



80. Diagram 184 



81. Do 184 



82. Do 185 



83. Do 187 



84. Do 190 



85. Do 193 



86. Newton's Monument in Westminster 



Abbey 198 



87. Birthplace of Newton 202 



88. Statue of Newton, Trinity College, 



Cambridge 204 



89. Huyghens 205 



90. Telescopic Appearance of Saturn ... 207 



9j/^ Pendulum 209 



^2. Cycloid 209 



93. Diagram coj 



94. Do co9 



oj^- Balance- Wheel of a Chronometer ... 209 

 /po. Position of Balance- Wheel of a Chro- 

 nometer OID 



97. Harrison's Gridiron Pendulum 211 



98. The Clepsydra 2ri 



99. The Vernier 212 



100. Telescopic Appearance of Jupiter ... 214 



101. Diagram 215 



102. Gregory's Reflecting Telescope (sec- 

 tion) 217 



103. Newton's Telescope (section) 217 



104. Newton's Prism 218 



105. - The Coloured Sectors 220 



106. Recomposition of Light by a Lens ... 221 



107, 108. Lenses (sections) 223 



109. Newton's Rings 224 



