Related to Invocation of circuits in nineteenth-century discussions of nerves and nervous action.
Description: 'The observations recorded... seem to show that a ganglion-cell may be developed upon a nerve-fibre already formed. Hence these ganglion-cells cannot be regarded as centres from which two nerve-fibres proceed direct to their peripheral distribution, but as centres placed at a part of a circuit which existed as a complete circuit before the ganglion-cell was developed in connexion with it.' (560)