Origin of the Pasteur Family, 1--Jean Joseph Pasteur, a Conscript in 1811; Sergeant-major in the 3rd Infantry Regiment, 3; a Knight of the Legion of Honour, 4; his Marriage, 5; the Tannery at Dôle, 6--Birth of Louis Pasteur, his Childhood and Youth, 6. Studies in Arbois College, 7. Departure for Paris, 11. Arrival in Paris, 11; the Barbet Boarding School, Home Sickness, 11. Return to Jura, Pasteur a Portrait Painter, 12; enters Besançon Royal College, 13; a Bachelier ès Lettres, a Preparation Master, 14; his Readings, 15. Friendship with Chappuis, 18; a Bachelier ès Sciences, 20; Pasteur admitted to the Ecole Normale, 22; Sorbonne Lectures, Impression produced by J. B. Dumas, 21. CHAPTER II 1844--1849 First Crystallographic Researches, 26; Pasteur a Curator in Balard’s Laboratory, works with Auguste Laurent, 32. Chemistry and Physics Theses, 34. Pasteur reads a Paper at the Académie des Sciences, 36. February days, 1848, 37. Molecular Dissymmetry, 38; J. J. Biot’s Emotion at Pasteur’s first Discovery, 41. Pasteur Professor of Physics at Dijon, 43. Professor of Chemistry at the Strasburg Faculty, his Friend Bertin, 45; M. Laurent, Rector of the Strasburg Academy, 47; Pasteur’s Marriage, 51. CHAPTER III 1850--1854 Disgrace of the Strasburg Rector, 54. Letter from Biot to Pasteur’s Father, 57. Letter from J. B. Dumas, 60. Interview with Mitscherlich, 61. Pasteur in quest of Racemic Acid, in Germany, Austria and Bohemia, 62. Pasteur a Knight of the Legion of Honour, 70. Biot’s Congratulations, 70. Proposed Work, 72. CHAPTER IV 1855--1859 Pasteur Dean of the new Lille Faculty, 75; his Teaching, 77; First Studies on Fermentations, 79. First Candidature for the Academy of Sciences, 81. Lactic Fermentation, 83. Pasteur Administrator of the Ecole Normale, 84. Alcoholic Fermentation, 85. Death of Pasteur’s eldest Daughter, 86. CHAPTER V 1860--1864 So-called spontaneous Generation, 88. Polemics and Experiments, 92. Renewed Candidature for the Académie des Sciences, 100. Lectures on Crystallography, 102. Pasteur elected a Member of the Académie des Sciences, 103. Conversation with Napoleon III, 104. Lecture at the Sorbonne on so-called spontaneous Generation, 106. Pasteur and the Students of the Ecole Normale, 109. Discussions raised by the question of spontaneous Generation, 111. Studies on Wine, 113. CHAPTER VI 1865--1870