In a paper on “The Distribution of the Nerves of the Dental Pulp,” published in the ‘Philosophical Transactions’ for 1912, I was able to show that the nerves of the tooth pulp do not terminate at the inner margin of the dentine as had been generally supposed, but that they actually enter the dentinal tubules with the dentinal fibrils or processes of the odontoblast cells, and are distributed within the hard tissue of the dentine. By the methods of preparation I then used, I was unable to demonstrate the neurofibril as a continuous uninterrupted fibre, although its continuity with the axis cylinder of the medullated nerves of the pulp was evident.