1. This article is an outcome of my current research on early 19th-century microscopy.
2. On the power of penetrating into space by telescopes; with a comparative determination of the extent of that power in natural vision, and in telescopes of various sizes and constructions; illustrated by select observations;Herschel;Philosophical Transactions of the Royal Society of London,1800
3. In the coming decades, Goring's distinction was the subject of much debate. In the 1860s, researchers still discussed whether Goring had been correct in applying Herschel's notion of penetrating power to the microscope, whether the function of the microscope was not completely different, and whether the term ‘penetrating power’ was appropriate for the microscope's optical properties.
4. On achromatic microscopes with a description of certain objects for trying their definition;Goring;Quarterly Journal of Science, Literature, and the Arts,1827
5. See, for example, Bradbury, S. (1967) The quality of the image produced by the compound microscope: 1700–1840. In Historical Aspects of Microscopy (Bradbury, S. and Turner, G.L'E., eds), 151–172 (p. 152), Heffer.