Nobel Prize certificate for Wilhelm Ostwald 1909 - Chemistry. The certificate was produced by artist Sofia Gisberg. In the upper right corner, you can see, among other things, the thermostat invented by Ostwald and an excerpt from the chemical formula of Ostwald's law of dilution.
<a href="//commons.wikimedia.org/wiki/Category:Sofia_Gisberg" title="Category:Sofia Gisberg">Sofia Gisberg</a> (1854-1926)
Self-scanned