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He recognized four types, which correspond exactly to Cuvier's four plans, though he calls them by different names. Let us compare them. Cuvier. Baer. Radiates, Peripheric, Mollusks, Massive, Articulates, Longitudinal, Vertebrates. Doubly Symmetrical. Though perhaps less felicitous, the names of Baer express the same ideas as those of Cuvier.
It is a still more interesting fact, 'that the sciatic nerve in the congenitally toeless animal has inherited the power of passing through all the different morbid states which have occurred in one of its parents from the time of the division till after its reunion with the peripheric end.
We may therefore reject as inexact the pretended law of eccentricity of the physiologists, who suppose that sensation is first perceived as it were centrally, and then, by an added act, is localised at the peripheric extremity of the nerve. This argument would only be correct if we admitted that the brain is perceived by the consciousness of the brain.
By the Peripheric he signified those in which all the parts converge from the periphery or circumference of the animal to its centre. Cuvier only reverses this definition in his name of Radiates, signifying the animals in which all parts radiate from the centre to the circumference.
It is a still more interesting fact, 'that the sciatic nerve in the congenitally toeless animal has inherited the power of passing through all the different morbid states which have occurred in one of its parents from the time of the division till after its reunion with the peripheric end.
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