1. Haehl, R. Samuel Hahnemann—His Life and Work. Vol. II, p. 53. London Homœopathic Publishing Company. Ed. Clarke and Wheeler, trans. Wheeler and Grundy.
2. Avogadro first described a method for measuring the number of molecules in a given amount of a substance in the Journal de Physics of 1811.
3. Microdose Paradox—A New Concept;Barnard;J.A.I.H.,1965
4. Private conversation with Dr. Twentyman.