It would be rash to conclude from the experience with lizards that ring-spots were of no biological value.
That is, is their biological value as satisfactory as their digestibility?
We know something concerning the motor memory of rodents and horses, and its biological value.
Are the Sphinx-markings purely morphological, or have they a biological value?
I shall return to this subject later, when treating of the biological value of special markings.
I will now briefly summarise the results of the investigation of the biological value of the Deilephila ring-spots.