... principle of achromatism was discovered (by Fraunhofer) and achromatic microscopes introduced in the early part of the 19th century. The use of chemical reagents, such as acetic acid, and various hardening fluids, came into fashion not long after. J. Mueller seems to have been one of the first to realise ... — Form and Function - A Contribution to the History of Animal Morphology • E. S. (Edward Stuart) Russell
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