Public Domain Mark
You can use this work for any purpose without restriction under copyright law. Read more about this licence.
Credit
Ueber den Farben- und Temperatur-Sinn mit besonderer Rücksicht auf Farbenblindheit / von W. Preyer. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)