ch. 1. Of times when dust was the companion of all
ch. 2. Old metaphors and new measures of the microcosm
ch. 3. Early discernment of the minute
ch. 5. Atoms and microbes: new guides to the small and invisible
ch. 6. Discerning the invisible for the good of the nation
ch. 7. Lighting up the microcosm
ch. 8. Snake still lurks.