DR. GILLETT:—A pulp will sometimes stand much irritation without showing evidence of inflammation. An inflamed pulp is not always painful. My experience with decalcified dentine under fillings has been gained chiefly from removing fillings which other dentists have inserted over such decalcified dentine, and I have seen many cases where the results were anything but satisfactory. DR. NILES:—I have had some experience in that line myself during the last thirty years, and I have generally found decalcified dentine under good fillings to be in as good condition as when it was left there. In most cases it was left there, not with any idea of conservative treatment, but because the dentist was too lazy to take it out. I do not believe that decalcified dentine, thoroughly cleansed and dried, and hermetically sealed, can do any harm whatever to a nerve, or create any irritating effect. I would not leave a sloppy piece of dentine in the bottom of a cavity, which could not be well dried; neither would I leave the cavity half-full of decay, because in that case I could not reasonably expect that there would be no irritation. DR. EDDY:—If my memory serves me right, Dr. Niles once read a paper before the American Academy of Dental Science, in which he stated that in those cases of decalcified dentine in the bottom of the cavity he invariably used arsenious acid, and treated them the same as he would an exposed pulp, and it went on record. Now, to-night, he seems to be advocating an entirely different method. DR. NILES:—I should like to see that statement. I have written a paper on the subject—you will find it probably in the _Independent Practitioner_—but I don't think you will find the statement there that I always destroy the nerve in cases where there is decalcified dentine at the bottom of the cavity. Of course, where I have inflammation in the pulp and the tooth is sore, I should destroy the pulp.