(4) Experiments and Observations on Different Kinds of Air, by Joseph Priestley (3 vols.). Birmingham, 790, vol. II, pp. 103-107. (5) Lectures on Experimental Philosophy, by Joseph Priestley, lecture IV., pp. 18, ig. J. Johnson, London, 1794. (6) Translated from Scheele's Om Brunsten, eller Magnesia, och dess Egenakaper. Stockholm, 1774, and published as Alembic Club Reprints, No. 13, 1897, p. 6. (7) According to some writers this was discovered by Berzelius. (8) Histoire de la Chimie, par Ferdinand Hoefer. Paris, 1869, Vol. CL, p. 289. (9) Elements of Chemistry, by Anton Laurent Lavoisier, translated by Robert Kerr, p. 8. London and Edinburgh, 1790. (10) Ibid., pp. 414-416. CHAPTER III. CHEMISTRY SINCE THE TIME OF DALTON (1) Sir Humphry Davy, in Phil. Trans., Vol. VIII. CHAPTER IV. ANATOMY AND PHYSIOLOGY IN THE EIGHTEENTH CENTURY (1) Baas, History of Medicine, p. 692. (2) Based on Thomas H. Huxley's Presidential Address to the British Association for the Advancement of Science, 1870. (3) Essays on Digestion, by James Carson. London, 1834, p. 6. (4) Ibid., p. 7. (5) John Hunter, On the Digestion of the Stomach after Death, first edition, pp. 183-188. (6) Erasmus Darwin, The Botanic Garden, pp. 448-453. London, 1799. CHAPTER V. ANATOMY AND PHYSIOLOGY IN THE NINETEENTH CENTURY (1) Baron de Cuvier's Theory of the Earth. New York, 1818, p. 123. (2) On the Organs and Mode of Fecundation of Orchidex and Asclepiadea, by Robert Brown, Esq., in Miscellaneous Botanical Works. London, 1866, Vol. I., pp. 511-514. (3) Justin Liebig, Animal Chemistry. London, 1843, p. 17f. CHAPTER VI. THEORIES OF ORGANIC EVOLUTION (1) "Essay on the Metamorphoses of Plants," by Goethe, translated for the present work from Grundriss einer Geschichte der Naturwissenschaften, by Friederich Dannemann (2 vols.). Leipzig, 1896, Vol. I., p. 194. (2) The Temple of Nature, or The Origin of Society, by Erasmus Darwin, edition published in 1807, p. 35. (3) Baron de Cuvier, Theory of the Earth. New York, 1818, p.74. (This was the introduction to Cuvier's great work.) (4) Robert Chambers, Explanations: a sequel to Vestiges of Creation. London, Churchill, 1845, pp. 148-153. CHAPTER VII. EIGHTEENTH-CENTURY MEDICINE (1) Condensed from Dr. Boerhaave's Academical Lectures on the Theory of Physic. London, 1751, pp. 77, 78. Boerhaave's lectures were published as Aphorismi de cognoscendis et curandis Morbis, Leyden, 1709. On this book Van Swieten wrote commentaries filling five volumes. Another very celebrated work of Boerhaave is his Institutiones et Experimenta Chemic, Paris, 1724, the germs of this being given as a lecture on his appointment to the chair of chemistry in the University of Leyden in 1718.