Public Domain Mark
You can use this work for any purpose without restriction under copyright law. Read more about this licence.
Credit
A rationale of the laws of cerebral vision : comprising the laws of single and of erect vision, deduced upon the principles of dioptrics / by John Fearn. 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)