LONDON. Royal Society, May 2.—Sir J. J. Thomson, president, in the chair.—Dr. J. H. Mummery: Nerve end-cells in the dental pulp. The author has carried further his researches on the distribution of the nerves of the dental pulp. In a paper published in the Phil. Trans, for 1912, he demonstrated that the fibres from the nerve plexus in the pulp beneath the odontoblasts do not terminate at the inner margin of the dentine as described by Huber and others, but that, although they form an open plexus around the odontoblast cells, they are also distributed to the dentinal tubes and enter the dentine in company with the dentinal fibril, but make no connection with it. Recent preparations with improved methods have demonstrated that the fibres from the deep plexus in the pulp pass to definite nerve end-cells or peripheral nerve end-organs, which this method of staining has revealed at the inner margin of the odontoblasts.—H. Onslow: The nature of growths in colloidal silica solutions. The late Dr. Charlton Bastian claimed to have synthesised certain symmetrical bodies, resembling Torulae and other minute organisms, from sterilised colloidal solutions which had been exposed for a long period to light. Further, he claimed that such organisms were capable of reproducing themselves. The author has repeated the experiments, using the special samples of sodium silicate reserved for and recommended by Dr. Bastian and following his directions in every detail. The greatest precautions were taken to avoid accidental contamination. The results obtained indicate that the method employed yields tubes which are absolutely sterile for all periods up to three years.