References and selected reading

1) W. B. Carpenter, 'The Microscope and its Revelations', London, 1857, second edition. Section 108, 'Test-Objects', pp. 183 - 189.

2) Cheese mites and other delicacies: the introduction of test objects into microscopy, Endeavour, Volume 27, Issue 3, September 2003, Pages 134-138, Jutta Schickore. (Link is to an Abstract and full access to subscribers.)

3) A General Textbook of Entomology, by A D Imms, fifth edition, London, 1942, p.691. Pygidium also has a wider definition for crustacea and arthropods, see e.g. Wikipedia entry.

4) J W Griffith and A Henfrey, 'The Micrographic Dictionary', third edition, 1875, p.773 - 776, ('test objects' entry). (Link is to full download of the 1856 first edition.)

5) E J Spitta, 'Microscopy, the construction, theory and use of the microscope', third edition, 1920, p.389, 400-401 and Plates XVIII - XX. Note: The second edition, dated 1909 does not discuss or illustrate the pygidium. The third edition can be downloaded from the Internet Archive.

6) 'Notes on Modern Microscope Manufacturers', by Brian Bracegirdle, Quekett Microscopical Club, London, 1996, p.78 ('Watson, W.' entry).

7) C R Goring, 'On Achromatic Microscopes, with a description of certain Objects for trying their Defining and Penetrating Power', Quarterly Journal of Science, Literature and Art, 1827, 23, 410-434. (Link is to Google Books full download.)


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