Mind, driven from the field of extension, erects its last fortress in the pineal gland.
In addition to these lines, all tadpoles show more or less distinctly a small whitish gland in the middle of the head between the eyes, the so-called frontal gland or pineal gland, which in early stages is connected with the brain.
This is the so-called c narion, or pineal gland, where in a minimized point the mind on one hand and the vital spirits on the other meet and communicate.
The pineal foramen, in the parietal bones, is as constantly present as it is absent in the other orders.
The epiphysis, or pineal body, is quite as degenerate as in mammals, although still forming a long stalk as in reptiles.