4/29. Mill collaborated in his "Flore du Vaucluse": "A virtuous man whose recent loss we shall all deplore joined his efforts to mine in this undertaking." Letter to the Mayor of Avignon, 1st December, 1833, communicated by M. Félix Achard. NOTES TO CHAPTER 5. 5/1. "Chimie agricole." 5/2. "Le Ciel." Lectures et Leçons pour tous. 5/3. "La Terre." Lectures et Leçons pour tous. 5/4. "La Chimie de l'oncle Paul." Lectures courantes pour toutes les écoles. 5/5. "Histoire de la bûche." 5/6. "Les jouets. Le Toton" (manuscript). The primitive fountain, the "antique appliance" transmitted by inheritance, "the invention perhaps of some little unemployed herd-boy," consisted originally of three apertures and three straws; two similar apertures on one side, with two short straws, which dipped into the water, and a single orifice on the other side for the longer straw which delivered the water. Happening one day to use only two straws, one on each side, the little Fabre perceived that the device worked just as well, and "so, quite unconsciously, without thinking of it, I discovered the syphon, the true syphon of the physicist." Loco cit. 5/7. "The chemistry course is a great success at home." To his brother, from Orange, 1875. 5/8. To his son Émile, 4th November, 1879. "The household; discussions as to domestic economy for use in girls' schools." 5/9. "Souvenirs entomologiques," 2nd series, chapter 1. 5/10. To the Mayor of Avignon, 1st December, 1873. Communicated by M. Félix Achard. 5/11. Letter to his brother, 1875. 5/12. Id. NOTES TO CHAPTER 6. 6/1. "Souvenirs entomologiques," 2nd series, chapter 1. "L'Harmas." 6/2. Id., 6th series, chapter 5. 6/3. The Lumbricus phosporeus of Dugés. Fabre had already clearly perceived that this curious phenomenon of phosphorescence appears at birth, and he saw in it a process of oxidation, a species of respiration, especially active in certain tissues. Letter to Léon Dufour, 1st February, 1857. Communicated by M. Félix Achard. 6/4. To his brother, from Carpentras, 15th August, 1846. 6/5. He died at the age of 96. 6/6. "Souvenirs entomologiques," 1st series, chapter 21. 6/7. To his son Émile, 4th November, 1879. 6/8. To Henry Devillario, 30th March, 1883. 6/9. Id., 17th December, 1888. NOTES TO CHAPTER 7. 7/1. "Souvenirs entomologiques," 8th series, chapter 12. 7/2. Id., 7th series, chapter 16. 7/3. Id., 1st series, chapter 4. 7/4. Id., 2nd series, chapter 3. 7/5. Id., 6th series, chapter 21. 7/6. Id., 1st series, chapter 19, and 2nd series, chapter 7. 7/7. Id., 7th series, chapter 23. 7/8. Maeterlinck, "The Bee." 7/9. "Souvenirs entomologiques," 7th series, chapter 2. 7/10. Id., 8th series, chapter 22. 7/11. Id., 6th series, chapter 6. 7/12. Id., 9th series, chapter 10. 7/13. Bergson, "l'Evolution créatrice." 7/14. "Souvenirs entomologiques," 10th series, chapter 6. 7/15. "Les Serviteurs" and "Les Auxiliaires."