Synopses & Reviews
Synopsis
Excerpt from On the Photochemistry of the Retina: And on Visual Purple
Awaiting patiently the future discovery of the exact nature and relations of what may be called the true visual substances, we shall still be justified in maintaining that the visual purple is, if not directly at least indirectly, connected with vision; and, in this sense, I have not hesitated to retain the name 'visual purple, ' in spite of the fact that frogs appear to see perfectly well in spite of the absence of any store of it in their retinas, and that many animals which never at any time seem to possess such a store, have nevertheless very respectable vision; and I trust that an account in the English language of its behaviour and properties will prove not unacceptable to the physiologists and psychologists of this country.
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